Converted compilers.py to a sub-package

1 files changed, 3213 insertions, 0 deletions

diff --git a/mesonbuild/compilers/compilers.py b/mesonbuild/compilers/compilers.py
new file mode 100644
index 0000000..0db8304
--- /dev/null
+++ b/mesonbuild/compilers/compilers.py
@@ -0,0 +1,3213 @@
+# Copyright 2012-2017 The Meson development team
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import contextlib, os.path, re, shutil, subprocess, tempfile
+
+from ..linkers import StaticLinker
+from .. import coredata
+from .. import mlog
+from .. import mesonlib
+from ..mesonlib import EnvironmentException, MesonException, version_compare, Popen_safe
+
+"""This file contains the data files of all compilers Meson knows
+about. To support a new compiler, add its information below.
+Also add corresponding autodetection code in environment.py."""
+
+header_suffixes = ('h', 'hh', 'hpp', 'hxx', 'H', 'ipp', 'moc', 'vapi', 'di')
+obj_suffixes = ('o', 'obj', 'res')
+lib_suffixes = ('a', 'lib', 'dll', 'dylib', 'so')
+# Mapping of language to suffixes of files that should always be in that language
+# This means we can't include .h headers here since they could be C, C++, ObjC, etc.
+lang_suffixes = {
+    'c': ('c',),
+    'cpp': ('cpp', 'cc', 'cxx', 'c++', 'hh', 'hpp', 'ipp', 'hxx'),
+    # f90, f95, f03, f08 are for free-form fortran ('f90' recommended)
+    # f, for, ftn, fpp are for fixed-form fortran ('f' or 'for' recommended)
+    'fortran': ('f90', 'f95', 'f03', 'f08', 'f', 'for', 'ftn', 'fpp'),
+    'd': ('d', 'di'),
+    'objc': ('m',),
+    'objcpp': ('mm',),
+    'rust': ('rs',),
+    'vala': ('vala', 'vapi'),
+    'cs': ('cs',),
+    'swift': ('swift',),
+    'java': ('java',),
+}
+cpp_suffixes = lang_suffixes['cpp'] + ('h',)
+c_suffixes = lang_suffixes['c'] + ('h',)
+# List of languages that can be linked with C code directly by the linker
+# used in build.py:process_compilers() and build.py:get_dynamic_linker()
+clike_langs = ('objcpp', 'objc', 'd', 'cpp', 'c', 'fortran',)
+clike_suffixes = ()
+for _l in clike_langs:
+    clike_suffixes += lang_suffixes[_l]
+clike_suffixes += ('h', 'll', 's')
+
+# All these are only for C-like languages; see `clike_langs` above.
+
+def sort_clike(lang):
+    '''
+    Sorting function to sort the list of languages according to
+    reversed(compilers.clike_langs) and append the unknown langs in the end.
+    The purpose is to prefer C over C++ for files that can be compiled by
+    both such as assembly, C, etc. Also applies to ObjC, ObjC++, etc.
+    '''
+    if lang not in clike_langs:
+        return 1
+    return -clike_langs.index(lang)
+
+def is_header(fname):
+    if hasattr(fname, 'fname'):
+        fname = fname.fname
+    suffix = fname.split('.')[-1]
+    return suffix in header_suffixes
+
+def is_source(fname):
+    if hasattr(fname, 'fname'):
+        fname = fname.fname
+    suffix = fname.split('.')[-1].lower()
+    return suffix in clike_suffixes
+
+def is_assembly(fname):
+    if hasattr(fname, 'fname'):
+        fname = fname.fname
+    return fname.split('.')[-1].lower() == 's'
+
+def is_llvm_ir(fname):
+    if hasattr(fname, 'fname'):
+        fname = fname.fname
+    return fname.split('.')[-1] == 'll'
+
+def is_object(fname):
+    if hasattr(fname, 'fname'):
+        fname = fname.fname
+    suffix = fname.split('.')[-1]
+    return suffix in obj_suffixes
+
+def is_library(fname):
+    if hasattr(fname, 'fname'):
+        fname = fname.fname
+    suffix = fname.split('.')[-1]
+    return suffix in lib_suffixes
+
+gnulike_buildtype_args = {'plain': [],
+                          # -O0 is passed for improved debugging information with gcc
+                          # See https://github.com/mesonbuild/meson/pull/509
+                          'debug': ['-O0', '-g'],
+                          'debugoptimized': ['-O2', '-g'],
+                          'release': ['-O3'],
+                          'minsize': ['-Os', '-g']}
+
+msvc_buildtype_args = {'plain': [],
+                       'debug': ["/MDd", "/ZI", "/Ob0", "/Od", "/RTC1"],
+                       'debugoptimized': ["/MD", "/Zi", "/O2", "/Ob1"],
+                       'release': ["/MD", "/O2", "/Ob2"],
+                       'minsize': ["/MD", "/Zi", "/Os", "/Ob1"],
+                       }
+
+apple_buildtype_linker_args = {'plain': [],
+                               'debug': [],
+                               'debugoptimized': [],
+                               'release': [],
+                               'minsize': [],
+                               }
+
+gnulike_buildtype_linker_args = {'plain': [],
+                                 'debug': [],
+                                 'debugoptimized': [],
+                                 'release': ['-Wl,-O1'],
+                                 'minsize': [],
+                                 }
+
+msvc_buildtype_linker_args = {'plain': [],
+                              'debug': [],
+                              'debugoptimized': [],
+                              'release': [],
+                              'minsize': ['/INCREMENTAL:NO'],
+                              }
+
+java_buildtype_args = {'plain': [],
+                       'debug': ['-g'],
+                       'debugoptimized': ['-g'],
+                       'release': [],
+                       'minsize': [],
+                       }
+
+rust_buildtype_args = {'plain': [],
+                       'debug': ['-C', 'debuginfo=2'],
+                       'debugoptimized': ['-C', 'debuginfo=2', '-C', 'opt-level=2'],
+                       'release': ['-C', 'opt-level=3'],
+                       'minsize': [], # In a future release: ['-C', 'opt-level=s'],
+                       }
+
+d_gdc_buildtype_args = {'plain': [],
+                        'debug': ['-g', '-O0'],
+                        'debugoptimized': ['-g', '-O'],
+                        'release': ['-O3', '-frelease'],
+                        'minsize': [],
+                        }
+
+d_ldc_buildtype_args = {'plain': [],
+                        'debug': ['-g', '-O0'],
+                        'debugoptimized': ['-g', '-O'],
+                        'release': ['-O3', '-release'],
+                        'minsize': [],
+                        }
+
+d_dmd_buildtype_args = {'plain': [],
+                        'debug': ['-g'],
+                        'debugoptimized': ['-g', '-O'],
+                        'release': ['-O', '-release'],
+                        'minsize': [],
+                        }
+
+mono_buildtype_args = {'plain': [],
+                       'debug': ['-debug'],
+                       'debugoptimized': ['-debug', '-optimize+'],
+                       'release': ['-optimize+'],
+                       'minsize': [],
+                       }
+
+swift_buildtype_args = {'plain': [],
+                        'debug': ['-g'],
+                        'debugoptimized': ['-g', '-O'],
+                        'release': ['-O'],
+                        'minsize': [],
+                        }
+
+gnu_winlibs = ['-lkernel32', '-luser32', '-lgdi32', '-lwinspool', '-lshell32',
+               '-lole32', '-loleaut32', '-luuid', '-lcomdlg32', '-ladvapi32']
+
+msvc_winlibs = ['kernel32.lib', 'user32.lib', 'gdi32.lib',
+                'winspool.lib', 'shell32.lib', 'ole32.lib', 'oleaut32.lib',
+                'uuid.lib', 'comdlg32.lib', 'advapi32.lib']
+
+gnu_color_args = {'auto': ['-fdiagnostics-color=auto'],
+                  'always': ['-fdiagnostics-color=always'],
+                  'never': ['-fdiagnostics-color=never'],
+                  }
+
+clang_color_args = {'auto': ['-Xclang', '-fcolor-diagnostics'],
+                    'always': ['-Xclang', '-fcolor-diagnostics'],
+                    'never': ['-Xclang', '-fno-color-diagnostics'],
+                    }
+
+base_options = {'b_pch': coredata.UserBooleanOption('b_pch', 'Use precompiled headers', True),
+                'b_lto': coredata.UserBooleanOption('b_lto', 'Use link time optimization', False),
+                'b_sanitize': coredata.UserComboOption('b_sanitize',
+                                                       'Code sanitizer to use',
+                                                       ['none', 'address', 'thread', 'undefined', 'memory'],
+                                                       'none'),
+                'b_lundef': coredata.UserBooleanOption('b_lundef', 'Use -Wl,--no-undefined when linking', True),
+                'b_asneeded': coredata.UserBooleanOption('b_asneeded', 'Use -Wl,--as-needed when linking', True),
+                'b_pgo': coredata.UserComboOption('b_pgo', 'Use profile guide optimization',
+                                                  ['off', 'generate', 'use'],
+                                                  'off'),
+                'b_coverage': coredata.UserBooleanOption('b_coverage',
+                                                         'Enable coverage tracking.',
+                                                         False),
+                'b_colorout': coredata.UserComboOption('b_colorout', 'Use colored output',
+                                                       ['auto', 'always', 'never'],
+                                                       'always'),
+                'b_ndebug': coredata.UserBooleanOption('b_ndebug',
+                                                       'Disable asserts',
+                                                       False),
+                'b_staticpic': coredata.UserBooleanOption('b_staticpic',
+                                                          'Build static libraries as position independent',
+                                                          True),
+                }
+
+def sanitizer_compile_args(value):
+    if value == 'none':
+        return []
+    args = ['-fsanitize=' + value]
+    if value == 'address':
+        args.append('-fno-omit-frame-pointer')
+    return args
+
+def sanitizer_link_args(value):
+    if value == 'none':
+        return []
+    args = ['-fsanitize=' + value]
+    return args
+
+def get_base_compile_args(options, compiler):
+    args = []
+    # FIXME, gcc/clang specific.
+    try:
+        if options['b_lto'].value:
+            args.append('-flto')
+    except KeyError:
+        pass
+    try:
+        args += compiler.get_colorout_args(options['b_colorout'].value)
+    except KeyError:
+        pass
+    try:
+        args += sanitizer_compile_args(options['b_sanitize'].value)
+    except KeyError:
+        pass
+    try:
+        pgo_val = options['b_pgo'].value
+        if pgo_val == 'generate':
+            args.append('-fprofile-generate')
+        elif pgo_val == 'use':
+            args.append('-fprofile-use')
+    except KeyError:
+        pass
+    try:
+        if options['b_coverage'].value:
+            args += compiler.get_coverage_args()
+    except KeyError:
+        pass
+    try:
+        if options['b_ndebug'].value:
+            args += ['-DNDEBUG']
+    except KeyError:
+        pass
+    return args
+
+def get_base_link_args(options, linker, is_shared_module):
+    args = []
+    # FIXME, gcc/clang specific.
+    try:
+        if options['b_lto'].value:
+            args.append('-flto')
+    except KeyError:
+        pass
+    try:
+        args += sanitizer_link_args(options['b_sanitize'].value)
+    except KeyError:
+        pass
+    try:
+        pgo_val = options['b_pgo'].value
+        if pgo_val == 'generate':
+            args.append('-fprofile-generate')
+        elif pgo_val == 'use':
+            args.append('-fprofile-use')
+    except KeyError:
+        pass
+    try:
+        if not is_shared_module and 'b_lundef' in linker.base_options and options['b_lundef'].value:
+            args.append('-Wl,--no-undefined')
+    except KeyError:
+        pass
+    try:
+        if 'b_asneeded' in linker.base_options and options['b_asneeded'].value:
+            args.append('-Wl,--as-needed')
+    except KeyError:
+        pass
+    try:
+        if options['b_coverage'].value:
+            args += linker.get_coverage_link_args()
+    except KeyError:
+        pass
+    return args
+
+class CrossNoRunException(MesonException):
+    pass
+
+class RunResult:
+    def __init__(self, compiled, returncode=999, stdout='UNDEFINED', stderr='UNDEFINED'):
+        self.compiled = compiled
+        self.returncode = returncode
+        self.stdout = stdout
+        self.stderr = stderr
+
+class CompilerArgs(list):
+    '''
+    Class derived from list() that manages a list of compiler arguments. Should
+    be used while constructing compiler arguments from various sources. Can be
+    operated with ordinary lists, so this does not need to be used everywhere.
+
+    All arguments must be inserted and stored in GCC-style (-lfoo, -Idir, etc)
+    and can converted to the native type of each compiler by using the
+    .to_native() method to which you must pass an instance of the compiler or
+    the compiler class.
+
+    New arguments added to this class (either with .append(), .extend(), or +=)
+    are added in a way that ensures that they override previous arguments.
+    For example:
+
+    >>> a = ['-Lfoo', '-lbar']
+    >>> a += ['-Lpho', '-lbaz']
+    >>> print(a)
+    ['-Lpho', '-Lfoo', '-lbar', '-lbaz']
+
+    Arguments will also be de-duped if they can be de-duped safely.
+
+    Note that because of all this, this class is not commutative and does not
+    preserve the order of arguments if it is safe to not. For example:
+    >>> ['-Ifoo', '-Ibar'] + ['-Ifez', '-Ibaz', '-Werror']
+    ['-Ifez', '-Ibaz', '-Ifoo', '-Ibar', '-Werror']
+    >>> ['-Ifez', '-Ibaz', '-Werror'] + ['-Ifoo', '-Ibar']
+    ['-Ifoo', '-Ibar', '-Ifez', '-Ibaz', '-Werror']
+
+    '''
+    # NOTE: currently this class is only for C-like compilers, but it can be
+    # extended to other languages easily. Just move the following to the
+    # compiler class and initialize when self.compiler is set.
+
+    # Arg prefixes that override by prepending instead of appending
+    prepend_prefixes = ('-I', '-L')
+    # Arg prefixes and args that must be de-duped by returning 2
+    dedup2_prefixes = ('-I', '-L', '-D', '-U')
+    dedup2_suffixes = ()
+    dedup2_args = ()
+    # Arg prefixes and args that must be de-duped by returning 1
+    dedup1_prefixes = ('-l',)
+    dedup1_suffixes = ('.lib', '.dll', '.so', '.dylib', '.a')
+    # Match a .so of the form path/to/libfoo.so.0.1.0
+    # Only UNIX shared libraries require this. Others have a fixed extension.
+    dedup1_regex = re.compile(r'([\/\\]|\A)lib.*\.so(\.[0-9]+)?(\.[0-9]+)?(\.[0-9]+)?$')
+    dedup1_args = ('-c', '-S', '-E', '-pipe', '-pthread')
+    compiler = None
+
+    def _check_args(self, args):
+        cargs = []
+        if len(args) > 2:
+            raise TypeError("CompilerArgs() only accepts at most 2 arguments: "
+                            "The compiler, and optionally an initial list")
+        elif not args:
+            return cargs
+        elif len(args) == 1:
+            if isinstance(args[0], (Compiler, StaticLinker)):
+                self.compiler = args[0]
+            else:
+                raise TypeError("you must pass a Compiler instance as one of "
+                                "the arguments")
+        elif len(args) == 2:
+            if isinstance(args[0], (Compiler, StaticLinker)):
+                self.compiler = args[0]
+                cargs = args[1]
+            elif isinstance(args[1], (Compiler, StaticLinker)):
+                cargs = args[0]
+                self.compiler = args[1]
+            else:
+                raise TypeError("you must pass a Compiler instance as one of "
+                                "the two arguments")
+        else:
+            raise AssertionError('Not reached')
+        return cargs
+
+    def __init__(self, *args):
+        super().__init__(self._check_args(args))
+
+    @classmethod
+    def _can_dedup(cls, arg):
+        '''
+        Returns whether the argument can be safely de-duped. This is dependent
+        on three things:
+
+        a) Whether an argument can be 'overriden' by a later argument.  For
+           example, -DFOO defines FOO and -UFOO undefines FOO. In this case, we
+           can safely remove the previous occurance and add a new one. The same
+           is true for include paths and library paths with -I and -L. For
+           these we return `2`. See `dedup2_prefixes` and `dedup2_args`.
+        b) Arguments that once specified cannot be undone, such as `-c` or
+           `-pipe`. New instances of these can be completely skipped. For these
+           we return `1`. See `dedup1_prefixes` and `dedup1_args`.
+        c) Whether it matters where or how many times on the command-line
+           a particular argument is present. This can matter for symbol
+           resolution in static or shared libraries, so we cannot de-dup or
+           reorder them. For these we return `0`. This is the default.
+
+        In addition to these, we handle library arguments specially.
+        With GNU ld, we surround library arguments with -Wl,--start/end-group
+        to recursively search for symbols in the libraries. This is not needed
+        with other linkers.
+        '''
+
+        # A standalone argument must never be deduplicated because it is
+        # defined by what comes _after_ it. Thus dedupping this:
+        # -D FOO -D BAR
+        # would yield either
+        # -D FOO BAR
+        # or
+        # FOO -D BAR
+        # both of which are invalid.
+        if arg in cls.dedup2_prefixes:
+            return 0
+        if arg in cls.dedup2_args or \
+           arg.startswith(cls.dedup2_prefixes) or \
+           arg.endswith(cls.dedup2_suffixes):
+            return 2
+        if arg in cls.dedup1_args or \
+           arg.startswith(cls.dedup1_prefixes) or \
+           arg.endswith(cls.dedup1_suffixes) or \
+           re.search(cls.dedup1_regex, arg):
+            return 1
+        return 0
+
+    @classmethod
+    def _should_prepend(cls, arg):
+        if arg.startswith(cls.prepend_prefixes):
+            return True
+        return False
+
+    def to_native(self):
+        # Check if we need to add --start/end-group for circular dependencies
+        # between static libraries.
+        if get_compiler_uses_gnuld(self.compiler):
+            group_started = False
+            for each in self:
+                if not each.startswith('-l') and not each.endswith('.a'):
+                    continue
+                i = self.index(each)
+                if not group_started:
+                    # First occurance of a library
+                    self.insert(i, '-Wl,--start-group')
+                    group_started = True
+            # Last occurance of a library
+            if group_started:
+                self.insert(i + 1, '-Wl,--end-group')
+        return self.compiler.unix_args_to_native(self)
+
+    def append_direct(self, arg):
+        '''
+        Append the specified argument without any reordering or de-dup
+        '''
+        super().append(arg)
+
+    def extend_direct(self, iterable):
+        '''
+        Extend using the elements in the specified iterable without any
+        reordering or de-dup
+        '''
+        super().extend(iterable)
+
+    def __add__(self, args):
+        new = CompilerArgs(self, self.compiler)
+        new += args
+        return new
+
+    def __iadd__(self, args):
+        '''
+        Add two CompilerArgs while taking into account overriding of arguments
+        and while preserving the order of arguments as much as possible
+        '''
+        pre = []
+        post = []
+        if not isinstance(args, list):
+            raise TypeError('can only concatenate list (not "{}") to list'.format(args))
+        for arg in args:
+            # If the argument can be de-duped, do it either by removing the
+            # previous occurance of it and adding a new one, or not adding the
+            # new occurance.
+            dedup = self._can_dedup(arg)
+            if dedup == 1:
+                # Argument already exists and adding a new instance is useless
+                if arg in self or arg in pre or arg in post:
+                    continue
+            if dedup == 2:
+                # Remove all previous occurances of the arg and add it anew
+                if arg in self:
+                    self.remove(arg)
+                if arg in pre:
+                    pre.remove(arg)
+                if arg in post:
+                    post.remove(arg)
+            if self._should_prepend(arg):
+                pre.append(arg)
+            else:
+                post.append(arg)
+        # Insert at the beginning
+        self[:0] = pre
+        # Append to the end
+        super().__iadd__(post)
+        return self
+
+    def __radd__(self, args):
+        new = CompilerArgs(args, self.compiler)
+        new += self
+        return new
+
+    def __mul__(self, args):
+        raise TypeError("can't multiply compiler arguments")
+
+    def __imul__(self, args):
+        raise TypeError("can't multiply compiler arguments")
+
+    def __rmul__(self, args):
+        raise TypeError("can't multiply compiler arguments")
+
+    def append(self, arg):
+        self.__iadd__([arg])
+
+    def extend(self, args):
+        self.__iadd__(args)
+
+class Compiler:
+    def __init__(self, exelist, version):
+        if isinstance(exelist, str):
+            self.exelist = [exelist]
+        elif isinstance(exelist, list):
+            self.exelist = exelist
+        else:
+            raise TypeError('Unknown argument to Compiler')
+        # In case it's been overriden by a child class already
+        if not hasattr(self, 'file_suffixes'):
+            self.file_suffixes = lang_suffixes[self.language]
+        if not hasattr(self, 'can_compile_suffixes'):
+            self.can_compile_suffixes = set(self.file_suffixes)
+        self.default_suffix = self.file_suffixes[0]
+        self.version = version
+        self.base_options = []
+
+    def __repr__(self):
+        repr_str = "<{0}: v{1} `{2}`>"
+        return repr_str.format(self.__class__.__name__, self.version,
+                               ' '.join(self.exelist))
+
+    def can_compile(self, src):
+        if hasattr(src, 'fname'):
+            src = src.fname
+        suffix = os.path.splitext(src)[1].lower()
+        if suffix and suffix[1:] in self.can_compile_suffixes:
+            return True
+        return False
+
+    def get_id(self):
+        return self.id
+
+    def get_language(self):
+        return self.language
+
+    def get_default_suffix(self):
+        return self.default_suffix
+
+    def get_exelist(self):
+        return self.exelist[:]
+
+    def get_builtin_define(self, *args, **kwargs):
+        raise EnvironmentException('%s does not support get_builtin_define.' % self.id)
+
+    def has_builtin_define(self, *args, **kwargs):
+        raise EnvironmentException('%s does not support has_builtin_define.' % self.id)
+
+    def get_always_args(self):
+        return []
+
+    def get_linker_always_args(self):
+        return []
+
+    def gen_import_library_args(self, implibname):
+        """
+        Used only on Windows for libraries that need an import library.
+        This currently means C, C++, Fortran.
+        """
+        return []
+
+    def get_options(self):
+        return {} # build afresh every time
+
+    def get_option_compile_args(self, options):
+        return []
+
+    def get_option_link_args(self, options):
+        return []
+
+    def has_header(self, *args, **kwargs):
+        raise EnvironmentException('Language %s does not support header checks.' % self.language)
+
+    def has_header_symbol(self, *args, **kwargs):
+        raise EnvironmentException('Language %s does not support header symbol checks.' % self.language)
+
+    def compiles(self, *args, **kwargs):
+        raise EnvironmentException('Language %s does not support compile checks.' % self.language)
+
+    def links(self, *args, **kwargs):
+        raise EnvironmentException('Language %s does not support link checks.' % self.language)
+
+    def run(self, *args, **kwargs):
+        raise EnvironmentException('Language %s does not support run checks.' % self.language)
+
+    def sizeof(self, *args, **kwargs):
+        raise EnvironmentException('Language %s does not support sizeof checks.' % self.language)
+
+    def alignment(self, *args, **kwargs):
+        raise EnvironmentException('Language %s does not support alignment checks.' % self.language)
+
+    def has_function(self, *args, **kwargs):
+        raise EnvironmentException('Language %s does not support function checks.' % self.language)
+
+    @classmethod
+    def unix_args_to_native(cls, args):
+        "Always returns a copy that can be independently mutated"
+        return args[:]
+
+    def find_library(self, *args, **kwargs):
+        raise EnvironmentException('Language {} does not support library finding.'.format(self.language))
+
+    def get_library_dirs(self):
+        return []
+
+    def has_argument(self, arg, env):
+        return self.has_multi_arguments([arg], env)
+
+    def has_multi_arguments(self, args, env):
+        raise EnvironmentException(
+            'Language {} does not support has_multi_arguments.'.format(
+                self.language))
+
+    def get_cross_extra_flags(self, environment, link):
+        extra_flags = []
+        if self.is_cross and environment:
+            if 'properties' in environment.cross_info.config:
+                props = environment.cross_info.config['properties']
+                lang_args_key = self.language + '_args'
+                extra_flags += props.get(lang_args_key, [])
+                lang_link_args_key = self.language + '_link_args'
+                if link:
+                    extra_flags += props.get(lang_link_args_key, [])
+        return extra_flags
+
+    def _get_compile_output(self, dirname, mode):
+        # In pre-processor mode, the output is sent to stdout and discarded
+        if mode == 'preprocess':
+            return None
+        # Extension only matters if running results; '.exe' is
+        # guaranteed to be executable on every platform.
+        if mode == 'link':
+            suffix = 'exe'
+        else:
+            suffix = 'obj'
+        return os.path.join(dirname, 'output.' + suffix)
+
+    @contextlib.contextmanager
+    def compile(self, code, extra_args=None, mode='link'):
+        if extra_args is None:
+            extra_args = []
+        try:
+            with tempfile.TemporaryDirectory() as tmpdirname:
+                if isinstance(code, str):
+                    srcname = os.path.join(tmpdirname,
+                                           'testfile.' + self.default_suffix)
+                    with open(srcname, 'w') as ofile:
+                        ofile.write(code)
+                elif isinstance(code, mesonlib.File):
+                    srcname = code.fname
+                output = self._get_compile_output(tmpdirname, mode)
+
+                # Construct the compiler command-line
+                commands = CompilerArgs(self)
+                commands.append(srcname)
+                commands += extra_args
+                commands += self.get_always_args()
+                if mode == 'compile':
+                    commands += self.get_compile_only_args()
+                # Preprocess mode outputs to stdout, so no output args
+                if mode == 'preprocess':
+                    commands += self.get_preprocess_only_args()
+                else:
+                    commands += self.get_output_args(output)
+                # Generate full command-line with the exelist
+                commands = self.get_exelist() + commands.to_native()
+                mlog.debug('Running compile:')
+                mlog.debug('Working directory: ', tmpdirname)
+                mlog.debug('Command line: ', ' '.join(commands), '\n')
+                mlog.debug('Code:\n', code)
+                p, p.stdo, p.stde = Popen_safe(commands, cwd=tmpdirname)
+                mlog.debug('Compiler stdout:\n', p.stdo)
+                mlog.debug('Compiler stderr:\n', p.stde)
+                p.input_name = srcname
+                p.output_name = output
+                yield p
+        except (PermissionError, OSError):
+            # On Windows antivirus programs and the like hold on to files so
+            # they can't be deleted. There's not much to do in this case. Also,
+            # catch OSError because the directory is then no longer empty.
+            pass
+
+    def get_colorout_args(self, colortype):
+        return []
+
+    # Some compilers (msvc) write debug info to a separate file.
+    # These args specify where it should be written.
+    def get_compile_debugfile_args(self, rel_obj, **kwargs):
+        return []
+
+    def get_link_debugfile_args(self, rel_obj):
+        return []
+
+    def get_std_shared_lib_link_args(self):
+        return []
+
+    def get_std_shared_module_link_args(self):
+        return self.get_std_shared_lib_link_args()
+
+    def get_link_whole_for(self, args):
+        if isinstance(args, list) and not args:
+            return []
+        raise EnvironmentException('Language %s does not support linking whole archives.' % self.language)
+
+    def build_unix_rpath_args(self, build_dir, from_dir, rpath_paths, install_rpath):
+        if not rpath_paths and not install_rpath:
+            return []
+        # The rpaths we write must be relative, because otherwise
+        # they have different length depending on the build
+        # directory. This breaks reproducible builds.
+        rel_rpaths = []
+        for p in rpath_paths:
+            if p == from_dir:
+                relative = '' # relpath errors out in this case
+            else:
+                relative = os.path.relpath(p, from_dir)
+            rel_rpaths.append(relative)
+        paths = ':'.join([os.path.join('$ORIGIN', p) for p in rel_rpaths])
+        if len(paths) < len(install_rpath):
+            padding = 'X' * (len(install_rpath) - len(paths))
+            if not paths:
+                paths = padding
+            else:
+                paths = paths + ':' + padding
+        args = ['-Wl,-rpath,' + paths]
+        if get_compiler_is_linuxlike(self):
+            # Rpaths to use while linking must be absolute. These are not
+            # written to the binary. Needed only with GNU ld:
+            # https://sourceware.org/bugzilla/show_bug.cgi?id=16936
+            # Not needed on Windows or other platforms that don't use RPATH
+            # https://github.com/mesonbuild/meson/issues/1897
+            lpaths = ':'.join([os.path.join(build_dir, p) for p in rpath_paths])
+            args += ['-Wl,-rpath-link,' + lpaths]
+        return args
+
+class CCompiler(Compiler):
+    def __init__(self, exelist, version, is_cross, exe_wrapper=None):
+        # If a child ObjC or CPP class has already set it, don't set it ourselves
+        if not hasattr(self, 'language'):
+            self.language = 'c'
+        super().__init__(exelist, version)
+        self.id = 'unknown'
+        self.is_cross = is_cross
+        self.can_compile_suffixes.add('h')
+        if isinstance(exe_wrapper, str):
+            self.exe_wrapper = [exe_wrapper]
+        else:
+            self.exe_wrapper = exe_wrapper
+
+    def needs_static_linker(self):
+        return True # When compiling static libraries, so yes.
+
+    def get_always_args(self):
+        '''
+        Args that are always-on for all C compilers other than MSVC
+        '''
+        return ['-pipe'] + get_largefile_args(self)
+
+    def get_linker_debug_crt_args(self):
+        """
+        Arguments needed to select a debug crt for the linker
+        This is only needed for MSVC
+        """
+        return []
+
+    def get_no_stdinc_args(self):
+        return ['-nostdinc']
+
+    def get_no_stdlib_link_args(self):
+        return ['-nostdlib']
+
+    def get_warn_args(self, level):
+        return self.warn_args[level]
+
+    def get_no_warn_args(self):
+        # Almost every compiler uses this for disabling warnings
+        return ['-w']
+
+    def get_soname_args(self, prefix, shlib_name, suffix, path, soversion, is_shared_module):
+        return []
+
+    def split_shlib_to_parts(self, fname):
+        return None, fname
+
+    # The default behavior is this, override in MSVC
+    def build_rpath_args(self, build_dir, from_dir, rpath_paths, install_rpath):
+        return self.build_unix_rpath_args(build_dir, from_dir, rpath_paths, install_rpath)
+
+    def get_dependency_gen_args(self, outtarget, outfile):
+        return ['-MMD', '-MQ', outtarget, '-MF', outfile]
+
+    def depfile_for_object(self, objfile):
+        return objfile + '.' + self.get_depfile_suffix()
+
+    def get_depfile_suffix(self):
+        return 'd'
+
+    def get_exelist(self):
+        return self.exelist[:]
+
+    def get_linker_exelist(self):
+        return self.exelist[:]
+
+    def get_preprocess_only_args(self):
+        return ['-E', '-P']
+
+    def get_compile_only_args(self):
+        return ['-c']
+
+    def get_no_optimization_args(self):
+        return ['-O0']
+
+    def get_compiler_check_args(self):
+        '''
+        Get arguments useful for compiler checks such as being permissive in
+        the code quality and not doing any optimization.
+        '''
+        return self.get_no_optimization_args()
+
+    def get_output_args(self, target):
+        return ['-o', target]
+
+    def get_linker_output_args(self, outputname):
+        return ['-o', outputname]
+
+    def get_coverage_args(self):
+        return ['--coverage']
+
+    def get_coverage_link_args(self):
+        return ['--coverage']
+
+    def get_werror_args(self):
+        return ['-Werror']
+
+    def get_std_exe_link_args(self):
+        return []
+
+    def get_include_args(self, path, is_system):
+        if path == '':
+            path = '.'
+        if is_system:
+            return ['-isystem', path]
+        return ['-I' + path]
+
+    def get_std_shared_lib_link_args(self):
+        return ['-shared']
+
+    def get_library_dirs(self):
+        stdo = Popen_safe(self.exelist + ['--print-search-dirs'])[1]
+        for line in stdo.split('\n'):
+            if line.startswith('libraries:'):
+                libstr = line.split('=', 1)[1]
+                return libstr.split(':')
+        return []
+
+    def get_pic_args(self):
+        return ['-fPIC']
+
+    def name_string(self):
+        return ' '.join(self.exelist)
+
+    def get_pch_use_args(self, pch_dir, header):
+        return ['-include', os.path.split(header)[-1]]
+
+    def get_pch_name(self, header_name):
+        return os.path.split(header_name)[-1] + '.' + self.get_pch_suffix()
+
+    def get_linker_search_args(self, dirname):
+        return ['-L' + dirname]
+
+    def gen_import_library_args(self, implibname):
+        """
+        The name of the outputted import library
+
+        This implementation is used only on Windows by compilers that use GNU ld
+        """
+        return ['-Wl,--out-implib=' + implibname]
+
+    def sanity_check_impl(self, work_dir, environment, sname, code):
+        mlog.debug('Sanity testing ' + self.language + ' compiler:', ' '.join(self.exelist))
+        mlog.debug('Is cross compiler: %s.' % str(self.is_cross))
+
+        extra_flags = []
+        source_name = os.path.join(work_dir, sname)
+        binname = sname.rsplit('.', 1)[0]
+        if self.is_cross:
+            binname += '_cross'
+            if self.exe_wrapper is None:
+                # Linking cross built apps is painful. You can't really
+                # tell if you should use -nostdlib or not and for example
+                # on OSX the compiler binary is the same but you need
+                # a ton of compiler flags to differentiate between
+                # arm and x86_64. So just compile.
+                extra_flags += self.get_cross_extra_flags(environment, link=False)
+                extra_flags += self.get_compile_only_args()
+            else:
+                extra_flags += self.get_cross_extra_flags(environment, link=True)
+        # Is a valid executable output for all toolchains and platforms
+        binname += '.exe'
+        # Write binary check source
+        binary_name = os.path.join(work_dir, binname)
+        with open(source_name, 'w') as ofile:
+            ofile.write(code)
+        # Compile sanity check
+        cmdlist = self.exelist + extra_flags + [source_name] + self.get_output_args(binary_name)
+        pc, stdo, stde = Popen_safe(cmdlist, cwd=work_dir)
+        mlog.debug('Sanity check compiler command line:', ' '.join(cmdlist))
+        mlog.debug('Sanity check compile stdout:')
+        mlog.debug(stdo)
+        mlog.debug('-----\nSanity check compile stderr:')
+        mlog.debug(stde)
+        mlog.debug('-----')
+        if pc.returncode != 0:
+            raise EnvironmentException('Compiler {0} can not compile programs.'.format(self.name_string()))
+        # Run sanity check
+        if self.is_cross:
+            if self.exe_wrapper is None:
+                # Can't check if the binaries run so we have to assume they do
+                return
+            cmdlist = self.exe_wrapper + [binary_name]
+        else:
+            cmdlist = [binary_name]
+        mlog.debug('Running test binary command: ' + ' '.join(cmdlist))
+        pe = subprocess.Popen(cmdlist)
+        pe.wait()
+        if pe.returncode != 0:
+            raise EnvironmentException('Executables created by {0} compiler {1} are not runnable.'.format(self.language, self.name_string()))
+
+    def sanity_check(self, work_dir, environment):
+        code = 'int main(int argc, char **argv) { int class=0; return class; }\n'
+        return self.sanity_check_impl(work_dir, environment, 'sanitycheckc.c', code)
+
+    def has_header(self, hname, prefix, env, extra_args=None, dependencies=None):
+        fargs = {'prefix': prefix, 'header': hname}
+        code = '''{prefix}
+        #ifdef __has_include
+         #if !__has_include("{header}")
+          #error "Header '{header}' could not be found"
+         #endif
+        #else
+         #include <{header}>
+        #endif'''
+        return self.compiles(code.format(**fargs), env, extra_args,
+                             dependencies, 'preprocess')
+
+    def has_header_symbol(self, hname, symbol, prefix, env, extra_args=None, dependencies=None):
+        fargs = {'prefix': prefix, 'header': hname, 'symbol': symbol}
+        t = '''{prefix}
+        #include <{header}>
+        int main () {{
+            /* If it's not defined as a macro, try to use as a symbol */
+            #ifndef {symbol}
+                {symbol};
+            #endif
+        }}'''
+        return self.compiles(t.format(**fargs), env, extra_args, dependencies)
+
+    def _get_compiler_check_args(self, env, extra_args, dependencies, mode='compile'):
+        if extra_args is None:
+            extra_args = []
+        elif isinstance(extra_args, str):
+            extra_args = [extra_args]
+        if dependencies is None:
+            dependencies = []
+        elif not isinstance(dependencies, list):
+            dependencies = [dependencies]
+        # Collect compiler arguments
+        args = CompilerArgs(self)
+        for d in dependencies:
+            # Add compile flags needed by dependencies
+            args += d.get_compile_args()
+            if mode == 'link':
+                # Add link flags needed to find dependencies
+                args += d.get_link_args()
+        # Select a CRT if needed since we're linking
+        if mode == 'link':
+            args += self.get_linker_debug_crt_args()
+        # Read c_args/cpp_args/etc from the cross-info file (if needed)
+        args += self.get_cross_extra_flags(env, link=(mode == 'link'))
+        if not self.is_cross:
+            if mode == 'preprocess':
+                # Add CPPFLAGS from the env.
+                args += env.coredata.external_preprocess_args[self.language]
+            elif mode == 'compile':
+                # Add CFLAGS/CXXFLAGS/OBJCFLAGS/OBJCXXFLAGS from the env
+                args += env.coredata.external_args[self.language]
+            elif mode == 'link':
+                # Add LDFLAGS from the env
+                args += env.coredata.external_link_args[self.language]
+        args += self.get_compiler_check_args()
+        # extra_args must override all other arguments, so we add them last
+        args += extra_args
+        return args
+
+    def compiles(self, code, env, extra_args=None, dependencies=None, mode='compile'):
+        args = self._get_compiler_check_args(env, extra_args, dependencies, mode)
+        # We only want to compile; not link
+        with self.compile(code, args.to_native(), mode) as p:
+            return p.returncode == 0
+
+    def _links_wrapper(self, code, env, extra_args, dependencies):
+        "Shares common code between self.links and self.run"
+        args = self._get_compiler_check_args(env, extra_args, dependencies, mode='link')
+        return self.compile(code, args)
+
+    def links(self, code, env, extra_args=None, dependencies=None):
+        with self._links_wrapper(code, env, extra_args, dependencies) as p:
+            return p.returncode == 0
+
+    def run(self, code, env, extra_args=None, dependencies=None):
+        if self.is_cross and self.exe_wrapper is None:
+            raise CrossNoRunException('Can not run test applications in this cross environment.')
+        with self._links_wrapper(code, env, extra_args, dependencies) as p:
+            if p.returncode != 0:
+                mlog.debug('Could not compile test file %s: %d\n' % (
+                    p.input_name,
+                    p.returncode))
+                return RunResult(False)
+            if self.is_cross:
+                cmdlist = self.exe_wrapper + [p.output_name]
+            else:
+                cmdlist = p.output_name
+            try:
+                pe, so, se = Popen_safe(cmdlist)
+            except Exception as e:
+                mlog.debug('Could not run: %s (error: %s)\n' % (cmdlist, e))
+                return RunResult(False)
+
+        mlog.debug('Program stdout:\n')
+        mlog.debug(so)
+        mlog.debug('Program stderr:\n')
+        mlog.debug(se)
+        return RunResult(True, pe.returncode, so, se)
+
+    def _compile_int(self, expression, prefix, env, extra_args, dependencies):
+        fargs = {'prefix': prefix, 'expression': expression}
+        t = '''#include <stdio.h>
+        {prefix}
+        int main() {{ static int a[1-2*!({expression})]; a[0]=0; return 0; }}'''
+        return self.compiles(t.format(**fargs), env, extra_args, dependencies)
+
+    def cross_compute_int(self, expression, low, high, guess, prefix, env, extra_args, dependencies):
+        if isinstance(guess, int):
+            if self._compile_int('%s == %d' % (expression, guess), prefix, env, extra_args, dependencies):
+                return guess
+
+        cur = low
+        while low < high:
+            cur = int((low + high) / 2)
+            if cur == low:
+                break
+
+            if self._compile_int('%s >= %d' % (expression, cur), prefix, env, extra_args, dependencies):
+                low = cur
+            else:
+                high = cur
+
+        if self._compile_int('%s == %d' % (expression, cur), prefix, env, extra_args, dependencies):
+            return cur
+        raise EnvironmentException('Cross-compile check overflowed')
+
+    def compute_int(self, expression, low, high, guess, prefix, env, extra_args=None, dependencies=None):
+        if extra_args is None:
+            extra_args = []
+        if self.is_cross:
+            return self.cross_compute_int(expression, low, high, guess, prefix, env, extra_args, dependencies)
+        fargs = {'prefix': prefix, 'expression': expression}
+        t = '''#include<stdio.h>
+        {prefix}
+        int main(int argc, char **argv) {{
+            printf("%ld\\n", (long)({expression}));
+            return 0;
+        }};'''
+        res = self.run(t.format(**fargs), env, extra_args, dependencies)
+        if not res.compiled:
+            return -1
+        if res.returncode != 0:
+            raise EnvironmentException('Could not run compute_int test binary.')
+        return int(res.stdout)
+
+    def cross_sizeof(self, typename, prefix, env, extra_args=None, dependencies=None):
+        if extra_args is None:
+            extra_args = []
+        fargs = {'prefix': prefix, 'type': typename}
+        t = '''#include <stdio.h>
+        {prefix}
+        int main(int argc, char **argv) {{
+            {type} something;
+        }}'''
+        if not self.compiles(t.format(**fargs), env, extra_args, dependencies):
+            return -1
+        return self.cross_compute_int('sizeof(%s)' % typename, 1, 128, None, prefix, env, extra_args, dependencies)
+
+    def sizeof(self, typename, prefix, env, extra_args=None, dependencies=None):
+        if extra_args is None:
+            extra_args = []
+        fargs = {'prefix': prefix, 'type': typename}
+        if self.is_cross:
+            return self.cross_sizeof(typename, prefix, env, extra_args, dependencies)
+        t = '''#include<stdio.h>
+        {prefix}
+        int main(int argc, char **argv) {{
+            printf("%ld\\n", (long)(sizeof({type})));
+            return 0;
+        }};'''
+        res = self.run(t.format(**fargs), env, extra_args, dependencies)
+        if not res.compiled:
+            return -1
+        if res.returncode != 0:
+            raise EnvironmentException('Could not run sizeof test binary.')
+        return int(res.stdout)
+
+    def cross_alignment(self, typename, prefix, env, extra_args=None, dependencies=None):
+        if extra_args is None:
+            extra_args = []
+        fargs = {'prefix': prefix, 'type': typename}
+        t = '''#include <stdio.h>
+        {prefix}
+        int main(int argc, char **argv) {{
+            {type} something;
+        }}'''
+        if not self.compiles(t.format(**fargs), env, extra_args, dependencies):
+            return -1
+        t = '''#include <stddef.h>
+        {prefix}
+        struct tmp {{
+            char c;
+            {type} target;
+        }};'''
+        return self.cross_compute_int('offsetof(struct tmp, target)', 1, 1024, None, t.format(**fargs), env, extra_args, dependencies)
+
+    def alignment(self, typename, prefix, env, extra_args=None, dependencies=None):
+        if extra_args is None:
+            extra_args = []
+        if self.is_cross:
+            return self.cross_alignment(typename, prefix, env, extra_args, dependencies)
+        fargs = {'prefix': prefix, 'type': typename}
+        t = '''#include <stdio.h>
+        #include <stddef.h>
+        {prefix}
+        struct tmp {{
+            char c;
+            {type} target;
+        }};
+        int main(int argc, char **argv) {{
+            printf("%d", (int)offsetof(struct tmp, target));
+            return 0;
+        }}'''
+        res = self.run(t.format(**fargs), env, extra_args, dependencies)
+        if not res.compiled:
+            raise EnvironmentException('Could not compile alignment test.')
+        if res.returncode != 0:
+            raise EnvironmentException('Could not run alignment test binary.')
+        align = int(res.stdout)
+        if align == 0:
+            raise EnvironmentException('Could not determine alignment of %s. Sorry. You might want to file a bug.' % typename)
+        return align
+
+    def get_define(self, dname, prefix, env, extra_args, dependencies):
+        delim = '"MESON_GET_DEFINE_DELIMITER"'
+        fargs = {'prefix': prefix, 'define': dname, 'delim': delim}
+        code = '''
+        {prefix}
+        #ifndef {define}
+        # define {define}
+        #endif
+        {delim}\n{define}'''
+        args = self._get_compiler_check_args(env, extra_args, dependencies,
+                                             mode='preprocess').to_native()
+        with self.compile(code.format(**fargs), args, 'preprocess') as p:
+            if p.returncode != 0:
+                raise EnvironmentException('Could not get define {!r}'.format(dname))
+        # Get the preprocessed value after the delimiter,
+        # minus the extra newline at the end
+        return p.stdo.split(delim + '\n')[-1][:-1]
+
+    @staticmethod
+    def _no_prototype_templ():
+        """
+        Try to find the function without a prototype from a header by defining
+        our own dummy prototype and trying to link with the C library (and
+        whatever else the compiler links in by default). This is very similar
+        to the check performed by Autoconf for AC_CHECK_FUNCS.
+        """
+        # Define the symbol to something else since it is defined by the
+        # includes or defines listed by the user or by the compiler. This may
+        # include, for instance _GNU_SOURCE which must be defined before
+        # limits.h, which includes features.h
+        # Then, undef the symbol to get rid of it completely.
+        head = '''
+        #define {func} meson_disable_define_of_{func}
+        {prefix}
+        #include <limits.h>
+        #undef {func}
+        '''
+        # Override any GCC internal prototype and declare our own definition for
+        # the symbol. Use char because that's unlikely to be an actual return
+        # value for a function which ensures that we override the definition.
+        head += '''
+        #ifdef __cplusplus
+        extern "C"
+        #endif
+        char {func} ();
+        '''
+        # The actual function call
+        main = '''
+        int main () {{
+          return {func} ();
+        }}'''
+        return head, main
+
+    @staticmethod
+    def _have_prototype_templ():
+        """
+        Returns a head-er and main() call that uses the headers listed by the
+        user for the function prototype while checking if a function exists.
+        """
+        # Add the 'prefix', aka defines, includes, etc that the user provides
+        # This may include, for instance _GNU_SOURCE which must be defined
+        # before limits.h, which includes features.h
+        head = '{prefix}\n#include <limits.h>\n'
+        # We don't know what the function takes or returns, so return it as an int.
+        # Just taking the address or comparing it to void is not enough because
+        # compilers are smart enough to optimize it away. The resulting binary
+        # is not run so we don't care what the return value is.
+        main = '''\nint main() {{
+            void *a = (void*) &{func};
+            long b = (long) a;
+            return (int) b;
+        }}'''
+        return head, main
+
+    def has_function(self, funcname, prefix, env, extra_args=None, dependencies=None):
+        """
+        First, this function looks for the symbol in the default libraries
+        provided by the compiler (stdlib + a few others usually). If that
+        fails, it checks if any of the headers specified in the prefix provide
+        an implementation of the function, and if that fails, it checks if it's
+        implemented as a compiler-builtin.
+        """
+        if extra_args is None:
+            extra_args = []
+
+        # Short-circuit if the check is already provided by the cross-info file
+        varname = 'has function ' + funcname
+        varname = varname.replace(' ', '_')
+        if self.is_cross:
+            val = env.cross_info.config['properties'].get(varname, None)
+            if val is not None:
+                if isinstance(val, bool):
+                    return val
+                raise EnvironmentException('Cross variable {0} is not a boolean.'.format(varname))
+
+        fargs = {'prefix': prefix, 'func': funcname}
+
+        # glibc defines functions that are not available on Linux as stubs that
+        # fail with ENOSYS (such as e.g. lchmod). In this case we want to fail
+        # instead of detecting the stub as a valid symbol.
+        # We already included limits.h earlier to ensure that these are defined
+        # for stub functions.
+        stubs_fail = '''
+        #if defined __stub_{func} || defined __stub___{func}
+        fail fail fail this function is not going to work
+        #endif
+        '''
+
+        # If we have any includes in the prefix supplied by the user, assume
+        # that the user wants us to use the symbol prototype defined in those
+        # includes. If not, then try to do the Autoconf-style check with
+        # a dummy prototype definition of our own.
+        # This is needed when the linker determines symbol availability from an
+        # SDK based on the prototype in the header provided by the SDK.
+        # Ignoring this prototype would result in the symbol always being
+        # marked as available.
+        if '#include' in prefix:
+            head, main = self._have_prototype_templ()
+        else:
+            head, main = self._no_prototype_templ()
+        templ = head + stubs_fail + main
+
+        if self.links(templ.format(**fargs), env, extra_args, dependencies):
+            return True
+
+        # MSVC does not have compiler __builtin_-s.
+        if self.get_id() == 'msvc':
+            return False
+
+        # Detect function as a built-in
+        #
+        # Some functions like alloca() are defined as compiler built-ins which
+        # are inlined by the compiler and you can't take their address, so we
+        # need to look for them differently. On nice compilers like clang, we
+        # can just directly use the __has_builtin() macro.
+        fargs['no_includes'] = '#include' not in prefix
+        t = '''{prefix}
+        int main() {{
+        #ifdef __has_builtin
+            #if !__has_builtin(__builtin_{func})
+                #error "__builtin_{func} not found"
+            #endif
+        #elif ! defined({func})
+            /* Check for __builtin_{func} only if no includes were added to the
+             * prefix above, which means no definition of {func} can be found.
+             * We would always check for this, but we get false positives on
+             * MSYS2 if we do. Their toolchain is broken, but we can at least
+             * give them a workaround. */
+            #if {no_includes:d}
+                __builtin_{func};
+            #else
+                #error "No definition for __builtin_{func} found in the prefix"
+            #endif
+        #endif
+        }}'''
+        return self.links(t.format(**fargs), env, extra_args, dependencies)
+
+    def has_members(self, typename, membernames, prefix, env, extra_args=None, dependencies=None):
+        if extra_args is None:
+            extra_args = []
+        fargs = {'prefix': prefix, 'type': typename, 'name': 'foo'}
+        # Create code that accesses all members
+        members = ''
+        for member in membernames:
+            members += '{}.{};\n'.format(fargs['name'], member)
+        fargs['members'] = members
+        t = '''{prefix}
+        void bar() {{
+            {type} {name};
+            {members}
+        }};'''
+        return self.compiles(t.format(**fargs), env, extra_args, dependencies)
+
+    def has_type(self, typename, prefix, env, extra_args, dependencies=None):
+        fargs = {'prefix': prefix, 'type': typename}
+        t = '''{prefix}
+        void bar() {{
+            sizeof({type});
+        }};'''
+        return self.compiles(t.format(**fargs), env, extra_args, dependencies)
+
+    def symbols_have_underscore_prefix(self, env):
+        '''
+        Check if the compiler prefixes an underscore to global C symbols
+        '''
+        symbol_name = b'meson_uscore_prefix'
+        code = '''#ifdef __cplusplus
+        extern "C" {
+        #endif
+        void ''' + symbol_name.decode() + ''' () {}
+        #ifdef __cplusplus
+        }
+        #endif
+        '''
+        args = self.get_cross_extra_flags(env, link=False)
+        args += self.get_compiler_check_args()
+        n = 'symbols_have_underscore_prefix'
+        with self.compile(code, args, 'compile') as p:
+            if p.returncode != 0:
+                m = 'BUG: Unable to compile {!r} check: {}'
+                raise RuntimeError(m.format(n, p.stdo))
+            if not os.path.isfile(p.output_name):
+                m = 'BUG: Can\'t find compiled test code for {!r} check'
+                raise RuntimeError(m.format(n))
+            with open(p.output_name, 'rb') as o:
+                for line in o:
+                    # Check if the underscore form of the symbol is somewhere
+                    # in the output file.
+                    if b'_' + symbol_name in line:
+                        return True
+                    # Else, check if the non-underscored form is present
+                    elif symbol_name in line:
+                        return False
+        raise RuntimeError('BUG: {!r} check failed unexpectedly'.format(n))
+
+    def find_library(self, libname, env, extra_dirs):
+        # First try if we can just add the library as -l.
+        code = '''int main(int argc, char **argv) {
+    return 0;
+}
+        '''
+        if extra_dirs and isinstance(extra_dirs, str):
+            extra_dirs = [extra_dirs]
+        # Gcc + co seem to prefer builtin lib dirs to -L dirs.
+        # Only try to find std libs if no extra dirs specified.
+        if not extra_dirs:
+            args = ['-l' + libname]
+            if self.links(code, env, extra_args=args):
+                return args
+        # Not found? Try to find the library file itself.
+        extra_dirs += self.get_library_dirs()
+        suffixes = ['so', 'dylib', 'lib', 'dll', 'a']
+        for d in extra_dirs:
+            for suffix in suffixes:
+                trial = os.path.join(d, 'lib' + libname + '.' + suffix)
+                if os.path.isfile(trial):
+                    return [trial]
+                trial2 = os.path.join(d, libname + '.' + suffix)
+                if os.path.isfile(trial2):
+                    return [trial2]
+        return None
+
+    def thread_flags(self):
+        return ['-pthread']
+
+    def thread_link_flags(self):
+        return ['-pthread']
+
+    def has_multi_arguments(self, args, env):
+        return self.compiles('int i;\n', env, extra_args=args)
+
+class CPPCompiler(CCompiler):
+    def __init__(self, exelist, version, is_cross, exe_wrap):
+        # If a child ObjCPP class has already set it, don't set it ourselves
+        if not hasattr(self, 'language'):
+            self.language = 'cpp'
+        CCompiler.__init__(self, exelist, version, is_cross, exe_wrap)
+
+    def get_no_stdinc_args(self):
+        return ['-nostdinc++']
+
+    def sanity_check(self, work_dir, environment):
+        code = 'class breakCCompiler;int main(int argc, char **argv) { return 0; }\n'
+        return self.sanity_check_impl(work_dir, environment, 'sanitycheckcpp.cc', code)
+
+    def get_compiler_check_args(self):
+        # -fpermissive allows non-conforming code to compile which is necessary
+        # for many C++ checks. Particularly, the has_header_symbol check is
+        # too strict without this and always fails.
+        return super().get_compiler_check_args() + ['-fpermissive']
+
+    def has_header_symbol(self, hname, symbol, prefix, env, extra_args=None, dependencies=None):
+        # Check if it's a C-like symbol
+        if super().has_header_symbol(hname, symbol, prefix, env, extra_args, dependencies):
+            return True
+        # Check if it's a class or a template
+        if extra_args is None:
+            extra_args = []
+        fargs = {'prefix': prefix, 'header': hname, 'symbol': symbol}
+        t = '''{prefix}
+        #include <{header}>
+        using {symbol};
+        int main () {{ return 0; }}'''
+        return self.compiles(t.format(**fargs), env, extra_args, dependencies)
+
+class ObjCCompiler(CCompiler):
+    def __init__(self, exelist, version, is_cross, exe_wrap):
+        self.language = 'objc'
+        CCompiler.__init__(self, exelist, version, is_cross, exe_wrap)
+
+    def sanity_check(self, work_dir, environment):
+        # TODO try to use sanity_check_impl instead of duplicated code
+        source_name = os.path.join(work_dir, 'sanitycheckobjc.m')
+        binary_name = os.path.join(work_dir, 'sanitycheckobjc')
+        extra_flags = self.get_cross_extra_flags(environment, link=False)
+        if self.is_cross:
+            extra_flags += self.get_compile_only_args()
+        with open(source_name, 'w') as ofile:
+            ofile.write('#import<stdio.h>\n'
+                        'int main(int argc, char **argv) { return 0; }\n')
+        pc = subprocess.Popen(self.exelist + extra_flags + [source_name, '-o', binary_name])
+        pc.wait()
+        if pc.returncode != 0:
+            raise EnvironmentException('ObjC compiler %s can not compile programs.' % self.name_string())
+        if self.is_cross:
+            # Can't check if the binaries run so we have to assume they do
+            return
+        pe = subprocess.Popen(binary_name)
+        pe.wait()
+        if pe.returncode != 0:
+            raise EnvironmentException('Executables created by ObjC compiler %s are not runnable.' % self.name_string())
+
+class ObjCPPCompiler(CPPCompiler):
+    def __init__(self, exelist, version, is_cross, exe_wrap):
+        self.language = 'objcpp'
+        CPPCompiler.__init__(self, exelist, version, is_cross, exe_wrap)
+
+    def sanity_check(self, work_dir, environment):
+        # TODO try to use sanity_check_impl instead of duplicated code
+        source_name = os.path.join(work_dir, 'sanitycheckobjcpp.mm')
+        binary_name = os.path.join(work_dir, 'sanitycheckobjcpp')
+        extra_flags = self.get_cross_extra_flags(environment, link=False)
+        if self.is_cross:
+            extra_flags += self.get_compile_only_args()
+        with open(source_name, 'w') as ofile:
+            ofile.write('#import<stdio.h>\n'
+                        'class MyClass;'
+                        'int main(int argc, char **argv) { return 0; }\n')
+        pc = subprocess.Popen(self.exelist + extra_flags + [source_name, '-o', binary_name])
+        pc.wait()
+        if pc.returncode != 0:
+            raise EnvironmentException('ObjC++ compiler %s can not compile programs.' % self.name_string())
+        if self.is_cross:
+            # Can't check if the binaries run so we have to assume they do
+            return
+        pe = subprocess.Popen(binary_name)
+        pe.wait()
+        if pe.returncode != 0:
+            raise EnvironmentException('Executables created by ObjC++ compiler %s are not runnable.' % self.name_string())
+
+class MonoCompiler(Compiler):
+    def __init__(self, exelist, version):
+        self.language = 'cs'
+        super().__init__(exelist, version)
+        self.id = 'mono'
+        self.monorunner = 'mono'
+
+    def get_output_args(self, fname):
+        return ['-out:' + fname]
+
+    def get_link_args(self, fname):
+        return ['-r:' + fname]
+
+    def get_soname_args(self, prefix, shlib_name, suffix, path, soversion, is_shared_module):
+        return []
+
+    def get_werror_args(self):
+        return ['-warnaserror']
+
+    def split_shlib_to_parts(self, fname):
+        return None, fname
+
+    def build_rpath_args(self, build_dir, from_dir, rpath_paths, install_rpath):
+        return []
+
+    def get_dependency_gen_args(self, outtarget, outfile):
+        return []
+
+    def get_linker_exelist(self):
+        return self.exelist[:]
+
+    def get_compile_only_args(self):
+        return []
+
+    def get_linker_output_args(self, outputname):
+        return []
+
+    def get_coverage_args(self):
+        return []
+
+    def get_coverage_link_args(self):
+        return []
+
+    def get_std_exe_link_args(self):
+        return []
+
+    def get_include_args(self, path):
+        return []
+
+    def get_pic_args(self):
+        return []
+
+    def name_string(self):
+        return ' '.join(self.exelist)
+
+    def get_pch_use_args(self, pch_dir, header):
+        return []
+
+    def get_pch_name(self, header_name):
+        return ''
+
+    def sanity_check(self, work_dir, environment):
+        src = 'sanity.cs'
+        obj = 'sanity.exe'
+        source_name = os.path.join(work_dir, src)
+        with open(source_name, 'w') as ofile:
+            ofile.write('''public class Sanity {
+    static public void Main () {
+    }
+}
+''')
+        pc = subprocess.Popen(self.exelist + [src], cwd=work_dir)
+        pc.wait()
+        if pc.returncode != 0:
+            raise EnvironmentException('Mono compiler %s can not compile programs.' % self.name_string())
+        cmdlist = [self.monorunner, obj]
+        pe = subprocess.Popen(cmdlist, cwd=work_dir)
+        pe.wait()
+        if pe.returncode != 0:
+            raise EnvironmentException('Executables created by Mono compiler %s are not runnable.' % self.name_string())
+
+    def needs_static_linker(self):
+        return False
+
+    def get_buildtype_args(self, buildtype):
+        return mono_buildtype_args[buildtype]
+
+class JavaCompiler(Compiler):
+    def __init__(self, exelist, version):
+        self.language = 'java'
+        super().__init__(exelist, version)
+        self.id = 'unknown'
+        self.javarunner = 'java'
+
+    def get_soname_args(self, prefix, shlib_name, suffix, path, soversion, is_shared_module):
+        return []
+
+    def get_werror_args(self):
+        return ['-Werror']
+
+    def split_shlib_to_parts(self, fname):
+        return None, fname
+
+    def build_rpath_args(self, build_dir, from_dir, rpath_paths, install_rpath):
+        return []
+
+    def get_dependency_gen_args(self, outtarget, outfile):
+        return []
+
+    def get_linker_exelist(self):
+        return self.exelist[:]
+
+    def get_compile_only_args(self):
+        return []
+
+    def get_output_args(self, subdir):
+        if subdir == '':
+            subdir = './'
+        return ['-d', subdir, '-s', subdir]
+
+    def get_linker_output_args(self, outputname):
+        return []
+
+    def get_coverage_args(self):
+        return []
+
+    def get_coverage_link_args(self):
+        return []
+
+    def get_std_exe_link_args(self):
+        return []
+
+    def get_include_args(self, path):
+        return []
+
+    def get_pic_args(self):
+        return []
+
+    def name_string(self):
+        return ' '.join(self.exelist)
+
+    def get_pch_use_args(self, pch_dir, header):
+        return []
+
+    def get_pch_name(self, header_name):
+        return ''
+
+    def get_buildtype_args(self, buildtype):
+        return java_buildtype_args[buildtype]
+
+    def sanity_check(self, work_dir, environment):
+        src = 'SanityCheck.java'
+        obj = 'SanityCheck'
+        source_name = os.path.join(work_dir, src)
+        with open(source_name, 'w') as ofile:
+            ofile.write('''class SanityCheck {
+  public static void main(String[] args) {
+    int i;
+  }
+}
+''')
+        pc = subprocess.Popen(self.exelist + [src], cwd=work_dir)
+        pc.wait()
+        if pc.returncode != 0:
+            raise EnvironmentException('Java compiler %s can not compile programs.' % self.name_string())
+        runner = shutil.which(self.javarunner)
+        if runner:
+            cmdlist = [runner, obj]
+            pe = subprocess.Popen(cmdlist, cwd=work_dir)
+            pe.wait()
+            if pe.returncode != 0:
+                raise EnvironmentException('Executables created by Java compiler %s are not runnable.' % self.name_string())
+        else:
+            m = "Java Virtual Machine wasn't found, but it's needed by Meson. " \
+                "Please install a JRE.\nIf you have specific needs where this " \
+                "requirement doesn't make sense, please open a bug at " \
+                "https://github.com/mesonbuild/meson/issues/new and tell us " \
+                "all about it."
+            raise EnvironmentException(m)
+
+    def needs_static_linker(self):
+        return False
+
+class ValaCompiler(Compiler):
+    def __init__(self, exelist, version):
+        self.language = 'vala'
+        super().__init__(exelist, version)
+        self.version = version
+        self.id = 'valac'
+        self.is_cross = False
+
+    def name_string(self):
+        return ' '.join(self.exelist)
+
+    def needs_static_linker(self):
+        return False # Because compiles into C.
+
+    def get_output_args(self, target):
+        return ['-o', target]
+
+    def get_compile_only_args(self):
+        return ['-C']
+
+    def get_pic_args(self):
+        return []
+
+    def get_always_args(self):
+        return ['-C']
+
+    def get_warn_args(self, warning_level):
+        return []
+
+    def get_no_warn_args(self):
+        return ['--disable-warnings']
+
+    def get_werror_args(self):
+        return ['--fatal-warnings']
+
+    def sanity_check(self, work_dir, environment):
+        code = 'class MesonSanityCheck : Object { }'
+        args = self.get_cross_extra_flags(environment, link=False)
+        with self.compile(code, args, 'compile') as p:
+            if p.returncode != 0:
+                msg = 'Vala compiler {!r} can not compile programs' \
+                      ''.format(self.name_string())
+                raise EnvironmentException(msg)
+
+    def get_buildtype_args(self, buildtype):
+        if buildtype == 'debug' or buildtype == 'debugoptimized' or buildtype == 'minsize':
+            return ['--debug']
+        return []
+
+    def find_library(self, libname, env, extra_dirs):
+        if extra_dirs and isinstance(extra_dirs, str):
+            extra_dirs = [extra_dirs]
+        # Valac always looks in the default vapi dir, so only search there if
+        # no extra dirs are specified.
+        if not extra_dirs:
+            code = 'class MesonFindLibrary : Object { }'
+            vapi_args = ['--pkg', libname]
+            args = self.get_cross_extra_flags(env, link=False)
+            args += vapi_args
+            with self.compile(code, args, 'compile') as p:
+                if p.returncode == 0:
+                    return vapi_args
+        # Not found? Try to find the vapi file itself.
+        for d in extra_dirs:
+            vapi = os.path.join(d, libname + '.vapi')
+            if os.path.isfile(vapi):
+                return [vapi]
+        mlog.debug('Searched {!r} and {!r} wasn\'t found'.format(extra_dirs, libname))
+        return None
+
+class RustCompiler(Compiler):
+    def __init__(self, exelist, version):
+        self.language = 'rust'
+        super().__init__(exelist, version)
+        self.id = 'rustc'
+
+    def needs_static_linker(self):
+        return False
+
+    def name_string(self):
+        return ' '.join(self.exelist)
+
+    def sanity_check(self, work_dir, environment):
+        source_name = os.path.join(work_dir, 'sanity.rs')
+        output_name = os.path.join(work_dir, 'rusttest')
+        with open(source_name, 'w') as ofile:
+            ofile.write('''fn main() {
+}
+''')
+        pc = subprocess.Popen(self.exelist + ['-o', output_name, source_name], cwd=work_dir)
+        pc.wait()
+        if pc.returncode != 0:
+            raise EnvironmentException('Rust compiler %s can not compile programs.' % self.name_string())
+        if subprocess.call(output_name) != 0:
+            raise EnvironmentException('Executables created by Rust compiler %s are not runnable.' % self.name_string())
+
+    def get_dependency_gen_args(self, outfile):
+        return ['--dep-info', outfile]
+
+    def get_buildtype_args(self, buildtype):
+        return rust_buildtype_args[buildtype]
+
+    def build_rpath_args(self, build_dir, from_dir, rpath_paths, install_rpath):
+        return self.build_unix_rpath_args(build_dir, from_dir, rpath_paths, install_rpath)
+
+    def get_sysroot(self):
+        cmd = self.exelist + ['--print', 'sysroot']
+        p, stdo, stde = Popen_safe(cmd)
+        return stdo.split('\n')[0]
+
+class SwiftCompiler(Compiler):
+    def __init__(self, exelist, version):
+        self.language = 'swift'
+        super().__init__(exelist, version)
+        self.version = version
+        self.id = 'llvm'
+        self.is_cross = False
+
+    def get_linker_exelist(self):
+        return self.exelist[:]
+
+    def name_string(self):
+        return ' '.join(self.exelist)
+
+    def needs_static_linker(self):
+        return True
+
+    def get_werror_args(self):
+        return ['--fatal-warnings']
+
+    def get_dependency_gen_args(self, outtarget, outfile):
+        return ['-emit-dependencies']
+
+    def depfile_for_object(self, objfile):
+        return os.path.splitext(objfile)[0] + '.' + self.get_depfile_suffix()
+
+    def get_depfile_suffix(self):
+        return 'd'
+
+    def get_output_args(self, target):
+        return ['-o', target]
+
+    def get_linker_output_args(self, target):
+        return ['-o', target]
+
+    def get_header_import_args(self, headername):
+        return ['-import-objc-header', headername]
+
+    def get_warn_args(self, level):
+        return []
+
+    def get_buildtype_args(self, buildtype):
+        return swift_buildtype_args[buildtype]
+
+    def get_buildtype_linker_args(self, buildtype):
+        return []
+
+    def get_std_exe_link_args(self):
+        return ['-emit-executable']
+
+    def get_module_args(self, modname):
+        return ['-module-name', modname]
+
+    def get_mod_gen_args(self):
+        return ['-emit-module']
+
+    def build_rpath_args(self, *args):
+        return [] # FIXME
+
+    def get_include_args(self, dirname):
+        return ['-I' + dirname]
+
+    def get_compile_only_args(self):
+        return ['-c']
+
+    def sanity_check(self, work_dir, environment):
+        src = 'swifttest.swift'
+        source_name = os.path.join(work_dir, src)
+        output_name = os.path.join(work_dir, 'swifttest')
+        with open(source_name, 'w') as ofile:
+            ofile.write('''print("Swift compilation is working.")
+''')
+        extra_flags = self.get_cross_extra_flags(environment, link=True)
+        pc = subprocess.Popen(self.exelist + extra_flags + ['-emit-executable', '-o', output_name, src], cwd=work_dir)
+        pc.wait()
+        if pc.returncode != 0:
+            raise EnvironmentException('Swift compiler %s can not compile programs.' % self.name_string())
+        if subprocess.call(output_name) != 0:
+            raise EnvironmentException('Executables created by Swift compiler %s are not runnable.' % self.name_string())
+
+class DCompiler(Compiler):
+    def __init__(self, exelist, version, is_cross):
+        self.language = 'd'
+        super().__init__(exelist, version)
+        self.id = 'unknown'
+        self.is_cross = is_cross
+
+    def sanity_check(self, work_dir, environment):
+        source_name = os.path.join(work_dir, 'sanity.d')
+        output_name = os.path.join(work_dir, 'dtest')
+        with open(source_name, 'w') as ofile:
+            ofile.write('''void main() {
+}
+''')
+        pc = subprocess.Popen(self.exelist + self.get_output_args(output_name) + [source_name], cwd=work_dir)
+        pc.wait()
+        if pc.returncode != 0:
+            raise EnvironmentException('D compiler %s can not compile programs.' % self.name_string())
+        if subprocess.call(output_name) != 0:
+            raise EnvironmentException('Executables created by D compiler %s are not runnable.' % self.name_string())
+
+    def needs_static_linker(self):
+        return True
+
+    def name_string(self):
+        return ' '.join(self.exelist)
+
+    def get_linker_exelist(self):
+        return self.exelist[:]
+
+    def get_preprocess_only_args(self):
+        return ['-E']
+
+    def get_compile_only_args(self):
+        return ['-c']
+
+    def depfile_for_object(self, objfile):
+        return objfile + '.' + self.get_depfile_suffix()
+
+    def get_depfile_suffix(self):
+        return 'dep'
+
+    def get_pic_args(self):
+        return ['-fPIC']
+
+    def get_std_shared_lib_link_args(self):
+        return ['-shared']
+
+    def get_soname_args(self, prefix, shlib_name, suffix, path, soversion, is_shared_module):
+        # FIXME: Make this work for Windows, MacOS and cross-compiling
+        return get_gcc_soname_args(GCC_STANDARD, prefix, shlib_name, suffix, path, soversion, is_shared_module)
+
+    def get_unittest_args(self):
+        return ['-unittest']
+
+    def get_buildtype_linker_args(self, buildtype):
+        return []
+
+    def get_std_exe_link_args(self):
+        return []
+
+    def build_rpath_args(self, build_dir, from_dir, rpath_paths, install_rpath):
+        # This method is to be used by LDC and DMD.
+        # GDC can deal with the verbatim flags.
+        if not rpath_paths and not install_rpath:
+            return []
+        paths = ':'.join([os.path.join(build_dir, p) for p in rpath_paths])
+        if len(paths) < len(install_rpath):
+            padding = 'X' * (len(install_rpath) - len(paths))
+            if not paths:
+                paths = padding
+            else:
+                paths = paths + ':' + padding
+        return ['-L-rpath={}'.format(paths)]
+
+    def _get_compiler_check_args(self, env, extra_args, dependencies, mode='compile'):
+        if extra_args is None:
+            extra_args = []
+        elif isinstance(extra_args, str):
+            extra_args = [extra_args]
+        if dependencies is None:
+            dependencies = []
+        elif not isinstance(dependencies, list):
+            dependencies = [dependencies]
+        # Collect compiler arguments
+        args = CompilerArgs(self)
+        for d in dependencies:
+            # Add compile flags needed by dependencies
+            args += d.get_compile_args()
+            if mode == 'link':
+                # Add link flags needed to find dependencies
+                args += d.get_link_args()
+
+        if mode == 'compile':
+            # Add DFLAGS from the env
+            args += env.coredata.external_args[self.language]
+        elif mode == 'link':
+            # Add LDFLAGS from the env
+            args += env.coredata.external_link_args[self.language]
+        # extra_args must override all other arguments, so we add them last
+        args += extra_args
+        return args
+
+    def compiles(self, code, env, extra_args=None, dependencies=None, mode='compile'):
+        args = self._get_compiler_check_args(env, extra_args, dependencies, mode)
+
+        with self.compile(code, args, mode) as p:
+            return p.returncode == 0
+
+    def has_multi_arguments(self, args, env):
+        return self.compiles('int i;\n', env, extra_args=args)
+
+    @classmethod
+    def translate_args_to_nongnu(cls, args):
+        dcargs = []
+        # Translate common arguments to flags the LDC/DMD compilers
+        # can understand.
+        # The flags might have been added by pkg-config files,
+        # and are therefore out of the user's control.
+        for arg in args:
+            if arg == '-pthread':
+                continue
+            if arg.startswith('-Wl,'):
+                linkargs = arg[arg.index(',') + 1:].split(',')
+                for la in linkargs:
+                    dcargs.append('-L' + la.strip())
+                continue
+            elif arg.startswith('-l'):
+                # translate library link flag
+                dcargs.append('-L' + arg)
+                continue
+            elif arg.startswith('-L/') or arg.startswith('-L./'):
+                # we need to handle cases where -L is set by e.g. a pkg-config
+                # setting to select a linker search path. We can however not
+                # unconditionally prefix '-L' with '-L' because the user might
+                # have set this flag too to do what it is intended to for this
+                # compiler (pass flag through to the linker)
+                # Hence, we guess here whether the flag was intended to pass
+                # a linker search path.
+                dcargs.append('-L' + arg)
+                continue
+            dcargs.append(arg)
+
+        return dcargs
+
+class GnuDCompiler(DCompiler):
+    def __init__(self, exelist, version, is_cross):
+        DCompiler.__init__(self, exelist, version, is_cross)
+        self.id = 'gcc'
+        default_warn_args = ['-Wall', '-Wdeprecated']
+        self.warn_args = {'1': default_warn_args,
+                          '2': default_warn_args + ['-Wextra'],
+                          '3': default_warn_args + ['-Wextra', '-Wpedantic']}
+        self.base_options = ['b_colorout', 'b_sanitize', 'b_staticpic']
+
+    def get_colorout_args(self, colortype):
+        if mesonlib.version_compare(self.version, '>=4.9.0'):
+            return gnu_color_args[colortype][:]
+        return []
+
+    def get_dependency_gen_args(self, outtarget, outfile):
+        return ['-fmake-deps=' + outfile]
+
+    def get_output_args(self, target):
+        return ['-o', target]
+
+    def get_linker_output_args(self, target):
+        return ['-o', target]
+
+    def get_include_args(self, path, is_system):
+        return ['-I' + path]
+
+    def get_warn_args(self, level):
+        return self.warn_args[level]
+
+    def get_werror_args(self):
+        return ['-Werror']
+
+    def get_linker_search_args(self, dirname):
+        return ['-L' + dirname]
+
+    def get_buildtype_args(self, buildtype):
+        return d_gdc_buildtype_args[buildtype]
+
+    def build_rpath_args(self, build_dir, from_dir, rpath_paths, install_rpath):
+        return self.build_unix_rpath_args(build_dir, from_dir, rpath_paths, install_rpath)
+
+    def get_unittest_args(self):
+        return ['-funittest']
+
+class LLVMDCompiler(DCompiler):
+    def __init__(self, exelist, version, is_cross):
+        DCompiler.__init__(self, exelist, version, is_cross)
+        self.id = 'llvm'
+        self.base_options = ['b_coverage', 'b_colorout']
+
+    def get_colorout_args(self, colortype):
+        if colortype == 'always':
+            return ['-enable-color']
+        return []
+
+    def get_dependency_gen_args(self, outtarget, outfile):
+        # LDC using the -deps flag returns a non-Makefile dependency-info file, which
+        # the backends can not use. So we disable this feature for now.
+        return []
+
+    def get_output_args(self, target):
+        return ['-of', target]
+
+    def get_linker_output_args(self, target):
+        return ['-of', target]
+
+    def get_include_args(self, path, is_system):
+        return ['-I' + path]
+
+    def get_warn_args(self, level):
+        if level == '2' or level == '3':
+            return ['-wi', '-dw']
+        else:
+            return ['-wi']
+
+    def get_werror_args(self):
+        return ['-w']
+
+    def get_coverage_args(self):
+        return ['-cov']
+
+    def get_buildtype_args(self, buildtype):
+        return d_ldc_buildtype_args[buildtype]
+
+    def get_pic_args(self):
+        return ['-relocation-model=pic']
+
+    def get_linker_search_args(self, dirname):
+        # -L is recognized as "add this to the search path" by the linker,
+        # while the compiler recognizes it as "pass to linker". So, the first
+        # -L is for the compiler, telling it to pass the second -L to the linker.
+        return ['-L-L' + dirname]
+
+    @classmethod
+    def unix_args_to_native(cls, args):
+        return cls.translate_args_to_nongnu(args)
+
+class DmdDCompiler(DCompiler):
+    def __init__(self, exelist, version, is_cross):
+        DCompiler.__init__(self, exelist, version, is_cross)
+        self.id = 'dmd'
+        self.base_options = ['b_coverage', 'b_colorout']
+
+    def get_colorout_args(self, colortype):
+        if colortype == 'always':
+            return ['-color=on']
+        return []
+
+    def get_dependency_gen_args(self, outtarget, outfile):
+        # LDC using the -deps flag returns a non-Makefile dependency-info file, which
+        # the backends can not use. So we disable this feature for now.
+        return []
+
+    def get_output_args(self, target):
+        return ['-of' + target]
+
+    def get_werror_args(self):
+        return ['-w']
+
+    def get_linker_output_args(self, target):
+        return ['-of' + target]
+
+    def get_include_args(self, path, is_system):
+        return ['-I' + path]
+
+    def get_warn_args(self, level):
+        return ['-wi']
+
+    def get_coverage_args(self):
+        return ['-cov']
+
+    def get_linker_search_args(self, dirname):
+        # -L is recognized as "add this to the search path" by the linker,
+        # while the compiler recognizes it as "pass to linker". So, the first
+        # -L is for the compiler, telling it to pass the second -L to the linker.
+        return ['-L-L' + dirname]
+
+    def get_buildtype_args(self, buildtype):
+        return d_dmd_buildtype_args[buildtype]
+
+    def get_std_shared_lib_link_args(self):
+        return ['-shared', '-defaultlib=libphobos2.so']
+
+    @classmethod
+    def unix_args_to_native(cls, args):
+        return cls.translate_args_to_nongnu(args)
+
+class VisualStudioCCompiler(CCompiler):
+    std_warn_args = ['/W3']
+    std_opt_args = ['/O2']
+
+    def __init__(self, exelist, version, is_cross, exe_wrap):
+        CCompiler.__init__(self, exelist, version, is_cross, exe_wrap)
+        self.id = 'msvc'
+        # /showIncludes is needed for build dependency tracking in Ninja
+        # See: https://ninja-build.org/manual.html#_deps
+        self.always_args = ['/nologo', '/showIncludes']
+        self.warn_args = {'1': ['/W2'],
+                          '2': ['/W3'],
+                          '3': ['/W4']}
+        self.base_options = ['b_pch'] # FIXME add lto, pgo and the like
+
+    # Override CCompiler.get_always_args
+    def get_always_args(self):
+        return self.always_args
+
+    def get_linker_debug_crt_args(self):
+        """
+        Arguments needed to select a debug crt for the linker
+
+        Sometimes we need to manually select the CRT (C runtime) to use with
+        MSVC. One example is when trying to link with static libraries since
+        MSVC won't auto-select a CRT for us in that case and will error out
+        asking us to select one.
+        """
+        return ['/MDd']
+
+    def get_buildtype_args(self, buildtype):
+        return msvc_buildtype_args[buildtype]
+
+    def get_buildtype_linker_args(self, buildtype):
+        return msvc_buildtype_linker_args[buildtype]
+
+    def get_pch_suffix(self):
+        return 'pch'
+
+    def get_pch_name(self, header):
+        chopped = os.path.split(header)[-1].split('.')[:-1]
+        chopped.append(self.get_pch_suffix())
+        pchname = '.'.join(chopped)
+        return pchname
+
+    def get_pch_use_args(self, pch_dir, header):
+        base = os.path.split(header)[-1]
+        pchname = self.get_pch_name(header)
+        return ['/FI' + base, '/Yu' + base, '/Fp' + os.path.join(pch_dir, pchname)]
+
+    def get_preprocess_only_args(self):
+        return ['/EP']
+
+    def get_compile_only_args(self):
+        return ['/c']
+
+    def get_no_optimization_args(self):
+        return ['/Od']
+
+    def get_output_args(self, target):
+        if target.endswith('.exe'):
+            return ['/Fe' + target]
+        return ['/Fo' + target]
+
+    def get_dependency_gen_args(self, outtarget, outfile):
+        return []
+
+    def get_linker_exelist(self):
+        return ['link'] # FIXME, should have same path as compiler.
+
+    def get_linker_always_args(self):
+        return ['/nologo']
+
+    def get_linker_output_args(self, outputname):
+        return ['/OUT:' + outputname]
+
+    def get_linker_search_args(self, dirname):
+        return ['/LIBPATH:' + dirname]
+
+    def get_pic_args(self):
+        return [] # PIC is handled by the loader on Windows
+
+    def get_std_shared_lib_link_args(self):
+        return ['/DLL']
+
+    def gen_vs_module_defs_args(self, defsfile):
+        if not isinstance(defsfile, str):
+            raise RuntimeError('Module definitions file should be str')
+        # With MSVC, DLLs only export symbols that are explicitly exported,
+        # so if a module defs file is specified, we use that to export symbols
+        return ['/DEF:' + defsfile]
+
+    def gen_pch_args(self, header, source, pchname):
+        objname = os.path.splitext(pchname)[0] + '.obj'
+        return objname, ['/Yc' + header, '/Fp' + pchname, '/Fo' + objname]
+
+    def gen_import_library_args(self, implibname):
+        "The name of the outputted import library"
+        return ['/IMPLIB:' + implibname]
+
+    def build_rpath_args(self, build_dir, from_dir, rpath_paths, install_rpath):
+        return []
+
+    # FIXME, no idea what these should be.
+    def thread_flags(self):
+        return []
+
+    def thread_link_flags(self):
+        return []
+
+    def get_options(self):
+        return {'c_winlibs': coredata.UserStringArrayOption('c_winlibs',
+                                                            'Windows libs to link against.',
+                                                            msvc_winlibs)
+                }
+
+    def get_option_link_args(self, options):
+        return options['c_winlibs'].value[:]
+
+    @classmethod
+    def unix_args_to_native(cls, args):
+        result = []
+        for i in args:
+            # -mms-bitfields is specific to MinGW-GCC
+            # -pthread is only valid for GCC
+            if i in ('-mms-bitfields', '-pthread'):
+                continue
+            if i.startswith('-L'):
+                i = '/LIBPATH:' + i[2:]
+            # Translate GNU-style -lfoo library name to the import library
+            elif i.startswith('-l'):
+                name = i[2:]
+                if name in ('m', 'c', 'pthread'):
+                    # With MSVC, these are provided by the C runtime which is
+                    # linked in by default
+                    continue
+                else:
+                    i = name + '.lib'
+            # -pthread in link flags is only used on Linux
+            elif i == '-pthread':
+                continue
+            result.append(i)
+        return result
+
+    def get_werror_args(self):
+        return ['/WX']
+
+    def get_include_args(self, path, is_system):
+        if path == '':
+            path = '.'
+        # msvc does not have a concept of system header dirs.
+        return ['-I' + path]
+
+    # Visual Studio is special. It ignores some arguments it does not
+    # understand and you can't tell it to error out on those.
+    # http://stackoverflow.com/questions/15259720/how-can-i-make-the-microsoft-c-compiler-treat-unknown-flags-as-errors-rather-t
+    def has_multi_arguments(self, args, env):
+        warning_text = '9002'
+        code = 'int i;\n'
+        (fd, srcname) = tempfile.mkstemp(suffix='.' + self.default_suffix)
+        os.close(fd)
+        with open(srcname, 'w') as ofile:
+            ofile.write(code)
+        # Read c_args/cpp_args/etc from the cross-info file (if needed)
+        extra_args = self.get_cross_extra_flags(env, link=False)
+        extra_args += self.get_compile_only_args()
+        commands = self.exelist + args + extra_args + [srcname]
+        mlog.debug('Running VS compile:')
+        mlog.debug('Command line: ', ' '.join(commands))
+        mlog.debug('Code:\n', code)
+        p, stdo, stde = Popen_safe(commands, cwd=os.path.split(srcname)[0])
+        if p.returncode != 0:
+            return False
+        return not(warning_text in stde or warning_text in stdo)
+
+    def get_compile_debugfile_args(self, rel_obj, pch=False):
+        pdbarr = rel_obj.split('.')[:-1]
+        pdbarr += ['pdb']
+        args = ['/Fd' + '.'.join(pdbarr)]
+        # When generating a PDB file with PCH, all compile commands write
+        # to the same PDB file. Hence, we need to serialize the PDB
+        # writes using /FS since we do parallel builds. This slows down the
+        # build obviously, which is why we only do this when PCH is on.
+        # This was added in Visual Studio 2013 (MSVC 18.0). Before that it was
+        # always on: https://msdn.microsoft.com/en-us/library/dn502518.aspx
+        if pch and mesonlib.version_compare(self.version, '>=18.0'):
+            args = ['/FS'] + args
+        return args
+
+    def get_link_debugfile_args(self, targetfile):
+        pdbarr = targetfile.split('.')[:-1]
+        pdbarr += ['pdb']
+        return ['/DEBUG', '/PDB:' + '.'.join(pdbarr)]
+
+    def get_link_whole_for(self, args):
+        # Only since VS2015
+        if not isinstance(args, list):
+            args = [args]
+        return ['/WHOLEARCHIVE:' + x for x in args]
+
+
+class VisualStudioCPPCompiler(VisualStudioCCompiler, CPPCompiler):
+    def __init__(self, exelist, version, is_cross, exe_wrap):
+        self.language = 'cpp'
+        CPPCompiler.__init__(self, exelist, version, is_cross, exe_wrap)
+        VisualStudioCCompiler.__init__(self, exelist, version, is_cross, exe_wrap)
+        self.base_options = ['b_pch'] # FIXME add lto, pgo and the like
+
+    def get_options(self):
+        return {'cpp_eh': coredata.UserComboOption('cpp_eh',
+                                                   'C++ exception handling type.',
+                                                   ['none', 'a', 's', 'sc'],
+                                                   'sc'),
+                'cpp_winlibs': coredata.UserStringArrayOption('cpp_winlibs',
+                                                              'Windows libs to link against.',
+                                                              msvc_winlibs)
+                }
+
+    def get_option_compile_args(self, options):
+        args = []
+        std = options['cpp_eh']
+        if std.value != 'none':
+            args.append('/EH' + std.value)
+        return args
+
+    def get_option_link_args(self, options):
+        return options['cpp_winlibs'].value[:]
+
+    def get_compiler_check_args(self):
+        # Visual Studio C++ compiler doesn't support -fpermissive,
+        # so just use the plain C args.
+        return super(VisualStudioCCompiler, self).get_compiler_check_args()
+
+GCC_STANDARD = 0
+GCC_OSX = 1
+GCC_MINGW = 2
+GCC_CYGWIN = 3
+
+CLANG_STANDARD = 0
+CLANG_OSX = 1
+CLANG_WIN = 2
+# Possibly clang-cl?
+
+ICC_STANDARD = 0
+ICC_OSX = 1
+ICC_WIN = 2
+
+def get_gcc_soname_args(gcc_type, prefix, shlib_name, suffix, path, soversion, is_shared_module):
+    if soversion is None:
+        sostr = ''
+    else:
+        sostr = '.' + soversion
+    if gcc_type in (GCC_STANDARD, GCC_MINGW, GCC_CYGWIN):
+        # Might not be correct for mingw but seems to work.
+        return ['-Wl,-soname,%s%s.%s%s' % (prefix, shlib_name, suffix, sostr)]
+    elif gcc_type == GCC_OSX:
+        if is_shared_module:
+            return []
+        return ['-install_name', os.path.join(path, 'lib' + shlib_name + '.dylib')]
+    else:
+        raise RuntimeError('Not implemented yet.')
+
+def get_compiler_is_linuxlike(compiler):
+    if (getattr(compiler, 'gcc_type', None) == GCC_STANDARD) or \
+       (getattr(compiler, 'clang_type', None) == CLANG_STANDARD) or \
+       (getattr(compiler, 'icc_type', None) == ICC_STANDARD):
+        return True
+    return False
+
+def get_compiler_uses_gnuld(c):
+    # FIXME: Perhaps we should detect the linker in the environment?
+    # FIXME: Assumes that *BSD use GNU ld, but they might start using lld soon
+    if (getattr(c, 'gcc_type', None) in (GCC_STANDARD, GCC_MINGW, GCC_CYGWIN)) or \
+       (getattr(c, 'clang_type', None) in (CLANG_STANDARD, CLANG_WIN)) or \
+       (getattr(c, 'icc_type', None) in (ICC_STANDARD, ICC_WIN)):
+        return True
+    return False
+
+def get_largefile_args(compiler):
+    '''
+    Enable transparent large-file-support for 32-bit UNIX systems
+    '''
+    if get_compiler_is_linuxlike(compiler):
+        # Enable large-file support unconditionally on all platforms other
+        # than macOS and Windows. macOS is now 64-bit-only so it doesn't
+        # need anything special, and Windows doesn't have automatic LFS.
+        # You must use the 64-bit counterparts explicitly.
+        # glibc, musl, and uclibc, and all BSD libcs support this. On Android,
+        # support for transparent LFS is available depending on the version of
+        # Bionic: https://github.com/android/platform_bionic#32-bit-abi-bugs
+        # https://code.google.com/p/android/issues/detail?id=64613
+        #
+        # If this breaks your code, fix it! It's been 20+ years!
+        return ['-D_FILE_OFFSET_BITS=64']
+        # We don't enable -D_LARGEFILE64_SOURCE since that enables
+        # transitionary features and must be enabled by programs that use
+        # those features explicitly.
+    return []
+
+
+class GnuCompiler:
+    # Functionality that is common to all GNU family compilers.
+    def __init__(self, gcc_type, defines):
+        self.id = 'gcc'
+        self.gcc_type = gcc_type
+        self.defines = defines or {}
+        self.base_options = ['b_pch', 'b_lto', 'b_pgo', 'b_sanitize', 'b_coverage',
+                             'b_colorout', 'b_ndebug', 'b_staticpic']
+        if self.gcc_type != GCC_OSX:
+            self.base_options.append('b_lundef')
+            self.base_options.append('b_asneeded')
+        # All GCC backends can do assembly
+        self.can_compile_suffixes.add('s')
+
+    def get_colorout_args(self, colortype):
+        if mesonlib.version_compare(self.version, '>=4.9.0'):
+            return gnu_color_args[colortype][:]
+        return []
+
+    def get_warn_args(self, level):
+        args = super().get_warn_args(level)
+        if mesonlib.version_compare(self.version, '<4.8.0') and '-Wpedantic' in args:
+            # -Wpedantic was added in 4.8.0
+            # https://gcc.gnu.org/gcc-4.8/changes.html
+            args[args.index('-Wpedantic')] = '-pedantic'
+        return args
+
+    def has_builtin_define(self, define):
+        return define in self.defines
+
+    def get_builtin_define(self, define):
+        if define in self.defines:
+            return self.defines[define]
+
+    def get_pic_args(self):
+        if self.gcc_type in (GCC_CYGWIN, GCC_MINGW, GCC_OSX):
+            return [] # On Window and OS X, pic is always on.
+        return ['-fPIC']
+
+    def get_buildtype_args(self, buildtype):
+        return gnulike_buildtype_args[buildtype]
+
+    def get_buildtype_linker_args(self, buildtype):
+        if self.gcc_type == GCC_OSX:
+            return apple_buildtype_linker_args[buildtype]
+        return gnulike_buildtype_linker_args[buildtype]
+
+    def get_pch_suffix(self):
+        return 'gch'
+
+    def split_shlib_to_parts(self, fname):
+        return os.path.split(fname)[0], fname
+
+    def get_soname_args(self, prefix, shlib_name, suffix, path, soversion, is_shared_module):
+        return get_gcc_soname_args(self.gcc_type, prefix, shlib_name, suffix, path, soversion, is_shared_module)
+
+    def get_std_shared_lib_link_args(self):
+        if self.gcc_type == GCC_OSX:
+            return ['-bundle']
+        return ['-shared']
+
+    def get_link_whole_for(self, args):
+        return ['-Wl,--whole-archive'] + args + ['-Wl,--no-whole-archive']
+
+    def gen_vs_module_defs_args(self, defsfile):
+        if not isinstance(defsfile, str):
+            raise RuntimeError('Module definitions file should be str')
+        # On Windows targets, .def files may be specified on the linker command
+        # line like an object file.
+        if self.gcc_type in (GCC_CYGWIN, GCC_MINGW):
+            return [defsfile]
+        # For other targets, discard the .def file.
+        return []
+
+    def get_gui_app_args(self):
+        if self.gcc_type in (GCC_CYGWIN, GCC_MINGW):
+            return ['-mwindows']
+        return []
+
+class GnuCCompiler(GnuCompiler, CCompiler):
+    def __init__(self, exelist, version, gcc_type, is_cross, exe_wrapper=None, defines=None):
+        CCompiler.__init__(self, exelist, version, is_cross, exe_wrapper)
+        GnuCompiler.__init__(self, gcc_type, defines)
+        default_warn_args = ['-Wall', '-Winvalid-pch']
+        self.warn_args = {'1': default_warn_args,
+                          '2': default_warn_args + ['-Wextra'],
+                          '3': default_warn_args + ['-Wextra', '-Wpedantic']}
+
+    def get_options(self):
+        opts = {'c_std': coredata.UserComboOption('c_std', 'C language standard to use',
+                                                  ['none', 'c89', 'c99', 'c11',
+                                                   'gnu89', 'gnu99', 'gnu11'],
+                                                  'none')}
+        if self.gcc_type == GCC_MINGW:
+            opts.update({
+                'c_winlibs': coredata.UserStringArrayOption('c_winlibs', 'Standard Win libraries to link against',
+                                                            gnu_winlibs), })
+        return opts
+
+    def get_option_compile_args(self, options):
+        args = []
+        std = options['c_std']
+        if std.value != 'none':
+            args.append('-std=' + std.value)
+        return args
+
+    def get_option_link_args(self, options):
+        if self.gcc_type == GCC_MINGW:
+            return options['c_winlibs'].value[:]
+        return []
+
+    def get_std_shared_lib_link_args(self):
+        return ['-shared']
+
+
+class GnuCPPCompiler(GnuCompiler, CPPCompiler):
+
+    def __init__(self, exelist, version, gcc_type, is_cross, exe_wrap, defines):
+        CPPCompiler.__init__(self, exelist, version, is_cross, exe_wrap)
+        GnuCompiler.__init__(self, gcc_type, defines)
+        default_warn_args = ['-Wall', '-Winvalid-pch', '-Wnon-virtual-dtor']
+        self.warn_args = {'1': default_warn_args,
+                          '2': default_warn_args + ['-Wextra'],
+                          '3': default_warn_args + ['-Wextra', '-Wpedantic']}
+
+    def get_options(self):
+        opts = {'cpp_std': coredata.UserComboOption('cpp_std', 'C++ language standard to use',
+                                                    ['none', 'c++03', 'c++11', 'c++14', 'c++1z',
+                                                     'gnu++03', 'gnu++11', 'gnu++14', 'gnu++1z'],
+                                                    'none'),
+                'cpp_debugstl': coredata.UserBooleanOption('cpp_debugstl',
+                                                           'STL debug mode',
+                                                           False)}
+        if self.gcc_type == GCC_MINGW:
+            opts.update({
+                'cpp_winlibs': coredata.UserStringArrayOption('cpp_winlibs', 'Standard Win libraries to link against',
+                                                              gnu_winlibs), })
+        return opts
+
+    def get_option_compile_args(self, options):
+        args = []
+        std = options['cpp_std']
+        if std.value != 'none':
+            args.append('-std=' + std.value)
+        if options['cpp_debugstl'].value:
+            args.append('-D_GLIBCXX_DEBUG=1')
+        return args
+
+    def get_option_link_args(self, options):
+        if self.gcc_type == GCC_MINGW:
+            return options['cpp_winlibs'].value[:]
+        return []
+
+
+class GnuObjCCompiler(GnuCompiler, ObjCCompiler):
+
+    def __init__(self, exelist, version, gcc_type, is_cross, exe_wrapper=None, defines=None):
+        ObjCCompiler.__init__(self, exelist, version, is_cross, exe_wrapper)
+        GnuCompiler.__init__(self, gcc_type, defines)
+        default_warn_args = ['-Wall', '-Winvalid-pch']
+        self.warn_args = {'1': default_warn_args,
+                          '2': default_warn_args + ['-Wextra'],
+                          '3': default_warn_args + ['-Wextra', '-Wpedantic']}
+
+class GnuObjCPPCompiler(GnuCompiler, ObjCPPCompiler):
+
+    def __init__(self, exelist, version, gcc_type, is_cross, exe_wrapper=None, defines=None):
+        ObjCPPCompiler.__init__(self, exelist, version, is_cross, exe_wrapper)
+        GnuCompiler.__init__(self, gcc_type, defines)
+        default_warn_args = ['-Wall', '-Winvalid-pch', '-Wnon-virtual-dtor']
+        self.warn_args = {'1': default_warn_args,
+                          '2': default_warn_args + ['-Wextra'],
+                          '3': default_warn_args + ['-Wextra', '-Wpedantic']}
+
+
+class ClangCompiler:
+    def __init__(self, clang_type):
+        self.id = 'clang'
+        self.clang_type = clang_type
+        self.base_options = ['b_pch', 'b_lto', 'b_pgo', 'b_sanitize', 'b_coverage',
+                             'b_ndebug', 'b_staticpic', 'b_colorout']
+        if self.clang_type != CLANG_OSX:
+            self.base_options.append('b_lundef')
+            self.base_options.append('b_asneeded')
+        # All Clang backends can do assembly and LLVM IR
+        self.can_compile_suffixes.update(['ll', 's'])
+
+    def get_pic_args(self):
+        if self.clang_type in (CLANG_WIN, CLANG_OSX):
+            return [] # On Window and OS X, pic is always on.
+        return ['-fPIC']
+
+    def get_colorout_args(self, colortype):
+        return clang_color_args[colortype][:]
+
+    def get_buildtype_args(self, buildtype):
+        return gnulike_buildtype_args[buildtype]
+
+    def get_buildtype_linker_args(self, buildtype):
+        if self.clang_type == CLANG_OSX:
+            return apple_buildtype_linker_args[buildtype]
+        return gnulike_buildtype_linker_args[buildtype]
+
+    def get_pch_suffix(self):
+        return 'pch'
+
+    def get_pch_use_args(self, pch_dir, header):
+        # Workaround for Clang bug http://llvm.org/bugs/show_bug.cgi?id=15136
+        # This flag is internal to Clang (or at least not documented on the man page)
+        # so it might change semantics at any time.
+        return ['-include-pch', os.path.join(pch_dir, self.get_pch_name(header))]
+
+    def get_soname_args(self, prefix, shlib_name, suffix, path, soversion, is_shared_module):
+        if self.clang_type == CLANG_STANDARD:
+            gcc_type = GCC_STANDARD
+        elif self.clang_type == CLANG_OSX:
+            gcc_type = GCC_OSX
+        elif self.clang_type == CLANG_WIN:
+            gcc_type = GCC_MINGW
+        else:
+            raise MesonException('Unreachable code when converting clang type to gcc type.')
+        return get_gcc_soname_args(gcc_type, prefix, shlib_name, suffix, path, soversion, is_shared_module)
+
+    def has_multi_arguments(self, args, env):
+        return super().has_multi_arguments(
+            ['-Werror=unknown-warning-option'] + args,
+            env)
+
+    def has_function(self, funcname, prefix, env, extra_args=None, dependencies=None):
+        if extra_args is None:
+            extra_args = []
+        # Starting with XCode 8, we need to pass this to force linker
+        # visibility to obey OS X and iOS minimum version targets with
+        # -mmacosx-version-min, -miphoneos-version-min, etc.
+        # https://github.com/Homebrew/homebrew-core/issues/3727
+        if self.clang_type == CLANG_OSX and version_compare(self.version, '>=8.0'):
+            extra_args.append('-Wl,-no_weak_imports')
+        return super().has_function(funcname, prefix, env, extra_args, dependencies)
+
+    def get_std_shared_module_link_args(self):
+        if self.clang_type == CLANG_OSX:
+            return ['-bundle', '-Wl,-undefined,dynamic_lookup']
+        return ['-shared']
+
+    def get_link_whole_for(self, args):
+        if self.clang_type == CLANG_OSX:
+            result = []
+            for a in args:
+                result += ['-Wl,-force_load', a]
+            return result
+        return ['-Wl,--whole-archive'] + args + ['-Wl,--no-whole-archive']
+
+
+class ClangCCompiler(ClangCompiler, CCompiler):
+    def __init__(self, exelist, version, clang_type, is_cross, exe_wrapper=None):
+        CCompiler.__init__(self, exelist, version, is_cross, exe_wrapper)
+        ClangCompiler.__init__(self, clang_type)
+        default_warn_args = ['-Wall', '-Winvalid-pch']
+        self.warn_args = {'1': default_warn_args,
+                          '2': default_warn_args + ['-Wextra'],
+                          '3': default_warn_args + ['-Wextra', '-Wpedantic']}
+
+    def get_options(self):
+        return {'c_std': coredata.UserComboOption('c_std', 'C language standard to use',
+                                                  ['none', 'c89', 'c99', 'c11',
+                                                   'gnu89', 'gnu99', 'gnu11'],
+                                                  'none')}
+
+    def get_option_compile_args(self, options):
+        args = []
+        std = options['c_std']
+        if std.value != 'none':
+            args.append('-std=' + std.value)
+        return args
+
+    def get_option_link_args(self, options):
+        return []
+
+
+class ClangCPPCompiler(ClangCompiler, CPPCompiler):
+    def __init__(self, exelist, version, cltype, is_cross, exe_wrapper=None):
+        CPPCompiler.__init__(self, exelist, version, is_cross, exe_wrapper)
+        ClangCompiler.__init__(self, cltype)
+        default_warn_args = ['-Wall', '-Winvalid-pch', '-Wnon-virtual-dtor']
+        self.warn_args = {'1': default_warn_args,
+                          '2': default_warn_args + ['-Wextra'],
+                          '3': default_warn_args + ['-Wextra', '-Wpedantic']}
+
+    def get_options(self):
+        return {'cpp_std': coredata.UserComboOption('cpp_std', 'C++ language standard to use',
+                                                    ['none', 'c++03', 'c++11', 'c++14', 'c++1z',
+                                                     'gnu++11', 'gnu++14', 'gnu++1z'],
+                                                    'none')}
+
+    def get_option_compile_args(self, options):
+        args = []
+        std = options['cpp_std']
+        if std.value != 'none':
+            args.append('-std=' + std.value)
+        return args
+
+    def get_option_link_args(self, options):
+        return []
+
+class ClangObjCCompiler(ClangCompiler, GnuObjCCompiler):
+    def __init__(self, exelist, version, cltype, is_cross, exe_wrapper=None):
+        GnuObjCCompiler.__init__(self, exelist, version, cltype, is_cross, exe_wrapper)
+        ClangCompiler.__init__(self, cltype)
+        self.base_options = ['b_pch', 'b_lto', 'b_pgo', 'b_sanitize', 'b_coverage']
+
+class ClangObjCPPCompiler(ClangCompiler, GnuObjCPPCompiler):
+    def __init__(self, exelist, version, cltype, is_cross, exe_wrapper=None):
+        GnuObjCPPCompiler.__init__(self, exelist, version, cltype, is_cross, exe_wrapper)
+        ClangCompiler.__init__(self, cltype)
+        self.base_options = ['b_pch', 'b_lto', 'b_pgo', 'b_sanitize', 'b_coverage']
+
+
+# Tested on linux for ICC 14.0.3, 15.0.6, 16.0.4, 17.0.1
+class IntelCompiler:
+    def __init__(self, icc_type):
+        self.id = 'intel'
+        self.icc_type = icc_type
+        self.lang_header = 'none'
+        self.base_options = ['b_pch', 'b_lto', 'b_pgo', 'b_sanitize', 'b_coverage',
+                             'b_colorout', 'b_ndebug', 'b_staticpic', 'b_lundef', 'b_asneeded']
+        # Assembly
+        self.can_compile_suffixes.add('s')
+
+    def get_pic_args(self):
+        return ['-fPIC']
+
+    def get_buildtype_args(self, buildtype):
+        return gnulike_buildtype_args[buildtype]
+
+    def get_buildtype_linker_args(self, buildtype):
+        return gnulike_buildtype_linker_args[buildtype]
+
+    def get_pch_suffix(self):
+        return 'pchi'
+
+    def get_pch_use_args(self, pch_dir, header):
+        return ['-pch', '-pch_dir', os.path.join(pch_dir), '-x',
+                self.lang_header, '-include', header, '-x', 'none']
+
+    def get_pch_name(self, header_name):
+        return os.path.split(header_name)[-1] + '.' + self.get_pch_suffix()
+
+    def split_shlib_to_parts(self, fname):
+        return os.path.split(fname)[0], fname
+
+    def get_soname_args(self, prefix, shlib_name, suffix, path, soversion, is_shared_module):
+        if self.icc_type == ICC_STANDARD:
+            gcc_type = GCC_STANDARD
+        elif self.icc_type == ICC_OSX:
+            gcc_type = GCC_OSX
+        elif self.icc_type == ICC_WIN:
+            gcc_type = GCC_MINGW
+        else:
+            raise MesonException('Unreachable code when converting icc type to gcc type.')
+        return get_gcc_soname_args(gcc_type, prefix, shlib_name, suffix, path, soversion, is_shared_module)
+
+    def get_std_shared_lib_link_args(self):
+        # FIXME: Don't know how icc works on OSX
+        # if self.icc_type == ICC_OSX:
+        #     return ['-bundle']
+        return ['-shared']
+
+
+class IntelCCompiler(IntelCompiler, CCompiler):
+    def __init__(self, exelist, version, icc_type, is_cross, exe_wrapper=None):
+        CCompiler.__init__(self, exelist, version, is_cross, exe_wrapper)
+        IntelCompiler.__init__(self, icc_type)
+        self.lang_header = 'c-header'
+        default_warn_args = ['-Wall', '-w3', '-diag-disable:remark', '-Wpch-messages']
+        self.warn_args = {'1': default_warn_args,
+                          '2': default_warn_args + ['-Wextra'],
+                          '3': default_warn_args + ['-Wextra', '-Wpedantic']}
+
+    def get_options(self):
+        c_stds = ['c89', 'c99']
+        g_stds = ['gnu89', 'gnu99']
+        if mesonlib.version_compare(self.version, '>=16.0.0'):
+            c_stds += ['c11']
+        opts = {'c_std': coredata.UserComboOption('c_std', 'C language standard to use',
+                                                  ['none'] + c_stds + g_stds,
+                                                  'none')}
+        return opts
+
+    def get_option_compile_args(self, options):
+        args = []
+        std = options['c_std']
+        if std.value != 'none':
+            args.append('-std=' + std.value)
+        return args
+
+    def get_std_shared_lib_link_args(self):
+        return ['-shared']
+
+    def has_multi_arguments(self, args, env):
+        return super().has_multi_arguments(args + ['-diag-error', '10006'], env)
+
+
+class IntelCPPCompiler(IntelCompiler, CPPCompiler):
+    def __init__(self, exelist, version, icc_type, is_cross, exe_wrap):
+        CPPCompiler.__init__(self, exelist, version, is_cross, exe_wrap)
+        IntelCompiler.__init__(self, icc_type)
+        self.lang_header = 'c++-header'
+        default_warn_args = ['-Wall', '-w3', '-diag-disable:remark',
+                             '-Wpch-messages', '-Wnon-virtual-dtor']
+        self.warn_args = {'1': default_warn_args,
+                          '2': default_warn_args + ['-Wextra'],
+                          '3': default_warn_args + ['-Wextra', '-Wpedantic']}
+
+    def get_options(self):
+        c_stds = []
+        g_stds = ['gnu++98']
+        if mesonlib.version_compare(self.version, '>=15.0.0'):
+            c_stds += ['c++11', 'c++14']
+            g_stds += ['gnu++11']
+        if mesonlib.version_compare(self.version, '>=16.0.0'):
+            c_stds += ['c++17']
+        if mesonlib.version_compare(self.version, '>=17.0.0'):
+            g_stds += ['gnu++14']
+        opts = {'cpp_std': coredata.UserComboOption('cpp_std', 'C++ language standard to use',
+                                                    ['none'] + c_stds + g_stds,
+                                                    'none'),
+                'cpp_debugstl': coredata.UserBooleanOption('cpp_debugstl',
+                                                           'STL debug mode',
+                                                           False)}
+        return opts
+
+    def get_option_compile_args(self, options):
+        args = []
+        std = options['cpp_std']
+        if std.value != 'none':
+            args.append('-std=' + std.value)
+        if options['cpp_debugstl'].value:
+            args.append('-D_GLIBCXX_DEBUG=1')
+        return args
+
+    def get_option_link_args(self, options):
+        return []
+
+    def has_multi_arguments(self, args, env):
+        return super().has_multi_arguments(args + ['-diag-error', '10006'], env)
+
+
+class FortranCompiler(Compiler):
+    def __init__(self, exelist, version, is_cross, exe_wrapper=None):
+        self.language = 'fortran'
+        super().__init__(exelist, version)
+        self.is_cross = is_cross
+        self.exe_wrapper = exe_wrapper
+        # Not really correct but I don't have Fortran compilers to test with. Sorry.
+        self.gcc_type = GCC_STANDARD
+        self.id = "IMPLEMENTATION CLASSES MUST SET THIS"
+
+    def name_string(self):
+        return ' '.join(self.exelist)
+
+    def get_pic_args(self):
+        if self.gcc_type in (GCC_CYGWIN, GCC_MINGW, GCC_OSX):
+            return [] # On Window and OS X, pic is always on.
+        return ['-fPIC']
+
+    def get_std_shared_lib_link_args(self):
+        return ['-shared']
+
+    def needs_static_linker(self):
+        return True
+
+    def sanity_check(self, work_dir, environment):
+        source_name = os.path.join(work_dir, 'sanitycheckf.f90')
+        binary_name = os.path.join(work_dir, 'sanitycheckf')
+        with open(source_name, 'w') as ofile:
+            ofile.write('''program prog
+     print *, "Fortran compilation is working."
+end program prog
+''')
+        extra_flags = self.get_cross_extra_flags(environment, link=True)
+        pc = subprocess.Popen(self.exelist + extra_flags + [source_name, '-o', binary_name])
+        pc.wait()
+        if pc.returncode != 0:
+            raise EnvironmentException('Compiler %s can not compile programs.' % self.name_string())
+        if self.is_cross:
+            if self.exe_wrapper is None:
+                # Can't check if the binaries run so we have to assume they do
+                return
+            cmdlist = self.exe_wrapper + [binary_name]
+        else:
+            cmdlist = [binary_name]
+        pe = subprocess.Popen(cmdlist, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+        pe.wait()
+        if pe.returncode != 0:
+            raise EnvironmentException('Executables created by Fortran compiler %s are not runnable.' % self.name_string())
+
+    def get_std_warn_args(self, level):
+        return FortranCompiler.std_warn_args
+
+    def get_buildtype_args(self, buildtype):
+        return gnulike_buildtype_args[buildtype]
+
+    def get_buildtype_linker_args(self, buildtype):
+        if mesonlib.is_osx():
+            return apple_buildtype_linker_args[buildtype]
+        return gnulike_buildtype_linker_args[buildtype]
+
+    def split_shlib_to_parts(self, fname):
+        return os.path.split(fname)[0], fname
+
+    def get_soname_args(self, prefix, shlib_name, suffix, path, soversion, is_shared_module):
+        return get_gcc_soname_args(self.gcc_type, prefix, shlib_name, suffix, path, soversion, is_shared_module)
+
+    def get_dependency_gen_args(self, outtarget, outfile):
+        # Disabled until this is fixed:
+        # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62162
+        # return ['-cpp', '-MMD', '-MQ', outtarget]
+        return []
+
+    def get_output_args(self, target):
+        return ['-o', target]
+
+    def get_preprocess_only_args(self):
+        return ['-E']
+
+    def get_compile_only_args(self):
+        return ['-c']
+
+    def get_linker_exelist(self):
+        return self.exelist[:]
+
+    def get_linker_output_args(self, outputname):
+        return ['-o', outputname]
+
+    def get_include_args(self, path, is_system):
+        return ['-I' + path]
+
+    def get_module_outdir_args(self, path):
+        return ['-J' + path]
+
+    def depfile_for_object(self, objfile):
+        return objfile + '.' + self.get_depfile_suffix()
+
+    def get_depfile_suffix(self):
+        return 'd'
+
+    def get_std_exe_link_args(self):
+        return []
+
+    def build_rpath_args(self, build_dir, from_dir, rpath_paths, install_rpath):
+        return self.build_unix_rpath_args(build_dir, from_dir, rpath_paths, install_rpath)
+
+    def module_name_to_filename(self, module_name):
+        return module_name.lower() + '.mod'
+
+    def get_warn_args(self, level):
+        return ['-Wall']
+
+    def get_no_warn_args(self):
+        return ['-w']
+
+
+class GnuFortranCompiler(FortranCompiler):
+    def __init__(self, exelist, version, gcc_type, is_cross, exe_wrapper=None, defines=None):
+        super().__init__(exelist, version, is_cross, exe_wrapper=None)
+        self.gcc_type = gcc_type
+        self.defines = defines or {}
+        self.id = 'gcc'
+
+    def has_builtin_define(self, define):
+        return define in self.defines
+
+    def get_builtin_define(self, define):
+        if define in self.defines:
+            return self.defines[define]
+
+    def get_always_args(self):
+        return ['-pipe']
+
+    def gen_import_library_args(self, implibname):
+        """
+        The name of the outputted import library
+
+        Used only on Windows
+        """
+        return ['-Wl,--out-implib=' + implibname]
+
+class G95FortranCompiler(FortranCompiler):
+    def __init__(self, exelist, version, is_cross, exe_wrapper=None):
+        super().__init__(exelist, version, is_cross, exe_wrapper=None)
+        self.id = 'g95'
+
+    def get_module_outdir_args(self, path):
+        return ['-fmod=' + path]
+
+    def get_always_args(self):
+        return ['-pipe']
+
+    def get_no_warn_args(self):
+        # FIXME: Confirm that there's no compiler option to disable all warnings
+        return []
+
+    def gen_import_library_args(self, implibname):
+        """
+        The name of the outputted import library
+
+        Used only on Windows
+        """
+        return ['-Wl,--out-implib=' + implibname]
+
+class SunFortranCompiler(FortranCompiler):
+    def __init__(self, exelist, version, is_cross, exe_wrapper=None):
+        super().__init__(exelist, version, is_cross, exe_wrapper=None)
+        self.id = 'sun'
+
+    def get_dependency_gen_args(self, outtarget, outfile):
+        return ['-fpp']
+
+    def get_always_args(self):
+        return []
+
+    def get_warn_args(self, level):
+        return []
+
+    def get_module_outdir_args(self, path):
+        return ['-moddir=' + path]
+
+class IntelFortranCompiler(IntelCompiler, FortranCompiler):
+    std_warn_args = ['-warn', 'all']
+
+    def __init__(self, exelist, version, is_cross, exe_wrapper=None):
+        self.file_suffixes = ('f90', 'f', 'for', 'ftn', 'fpp')
+        FortranCompiler.__init__(self, exelist, version, is_cross, exe_wrapper)
+        # FIXME: Add support for OS X and Windows in detect_fortran_compiler so
+        # we are sent the type of compiler
+        IntelCompiler.__init__(self, ICC_STANDARD)
+        self.id = 'intel'
+
+    def get_module_outdir_args(self, path):
+        return ['-module', path]
+
+    def get_warn_args(self, level):
+        return IntelFortranCompiler.std_warn_args
+
+class PathScaleFortranCompiler(FortranCompiler):
+    std_warn_args = ['-fullwarn']
+
+    def __init__(self, exelist, version, is_cross, exe_wrapper=None):
+        super().__init__(exelist, version, is_cross, exe_wrapper=None)
+        self.id = 'pathscale'
+
+    def get_module_outdir_args(self, path):
+        return ['-module', path]
+
+    def get_std_warn_args(self, level):
+        return PathScaleFortranCompiler.std_warn_args
+
+class PGIFortranCompiler(FortranCompiler):
+    std_warn_args = ['-Minform=inform']
+
+    def __init__(self, exelist, version, is_cross, exe_wrapper=None):
+        super().__init__(exelist, version, is_cross, exe_wrapper=None)
+        self.id = 'pgi'
+
+    def get_module_outdir_args(self, path):
+        return ['-module', path]
+
+    def get_warn_args(self, level):
+        return PGIFortranCompiler.std_warn_args
+
+    def get_no_warn_args(self):
+        return ['-silent']
+
+
+class Open64FortranCompiler(FortranCompiler):
+    std_warn_args = ['-fullwarn']
+
+    def __init__(self, exelist, version, is_cross, exe_wrapper=None):
+        super().__init__(exelist, version, is_cross, exe_wrapper=None)
+        self.id = 'open64'
+
+    def get_module_outdir_args(self, path):
+        return ['-module', path]
+
+    def get_warn_args(self, level):
+        return Open64FortranCompiler.std_warn_args
+
+class NAGFortranCompiler(FortranCompiler):
+    std_warn_args = []
+
+    def __init__(self, exelist, version, is_cross, exe_wrapper=None):
+        super().__init__(exelist, version, is_cross, exe_wrapper=None)
+        self.id = 'nagfor'
+
+    def get_module_outdir_args(self, path):
+        return ['-mdir', path]
+
+    def get_warn_args(self, level):
+        return NAGFortranCompiler.std_warn_args