compilers: split gnu and gnulike compilers out of compilers

I debated a bit whether both classes really belong in the same module,
and decided that they do because the share a number of helpers.

10 files changed, 405 insertions, 373 deletions

diff --git a/mesonbuild/compilers/__init__.py b/mesonbuild/compilers/__init__.py
index 98241a6..ac3f160 100644
--- a/mesonbuild/compilers/__init__.py
+++ b/mesonbuild/compilers/__init__.py
@@ -107,7 +107,6 @@ from .compilers import (
     clink_langs,
     c_suffixes,
     cpp_suffixes,
-    get_macos_dylib_install_name,
     get_base_compile_args,
     get_base_link_args,
     is_header,
@@ -121,7 +120,6 @@ from .compilers import (
     sort_clink,
     ClangCompiler,
     CompilerArgs,
-    GnuCompiler,
     IntelGnuLikeCompiler,
     IntelVisualStudioLikeCompiler,
 )
@@ -190,3 +188,4 @@ from .rust import RustCompiler
 from .swift import SwiftCompiler
 from .vala import ValaCompiler
 from .mixins.visualstudio import VisualStudioLikeCompiler
+from .mixins.gnu import GnuCompiler, get_macos_dylib_install_name
\ No newline at end of file
diff --git a/mesonbuild/compilers/c.py b/mesonbuild/compilers/c.py
index 2effec6..3a7c1f9 100644
--- a/mesonbuild/compilers/c.py
+++ b/mesonbuild/compilers/c.py
@@ -22,6 +22,7 @@ from .mixins.clike import CLikeCompiler
 from .mixins.ccrx import CcrxCompiler
 from .mixins.arm import ArmCompiler
 from .mixins.visualstudio import VisualStudioLikeCompiler
+from .mixins.gnu import GnuCompiler
 from .compilers import (
     gnu_winlibs,
     msvc_winlibs,
@@ -29,7 +30,6 @@ from .compilers import (
     ClangCompiler,
     Compiler,
     CompilerType,
-    GnuCompiler,
     ElbrusCompiler,
     IntelGnuLikeCompiler,
     IntelVisualStudioLikeCompiler,
diff --git a/mesonbuild/compilers/compilers.py b/mesonbuild/compilers/compilers.py
index 0b06072..ed41c2e 100644
--- a/mesonbuild/compilers/compilers.py
+++ b/mesonbuild/compilers/compilers.py
@@ -13,8 +13,6 @@
 # limitations under the License.
 
 import abc, contextlib, enum, os.path, re, tempfile, shlex
-import functools
-import subprocess
 from typing import List, Optional, Tuple
 from pathlib import Path
 
@@ -30,6 +28,7 @@ from ..envconfig import (
     Properties,
 )
 from .mixins.visualstudio import VisualStudioLikeCompiler
+from .mixins.gnu import GnuCompiler, GnuLikeCompiler
 
 """This file contains the data files of all compilers Meson knows
 about. To support a new compiler, add its information below.
@@ -139,14 +138,6 @@ def is_library(fname):
     suffix = fname.split('.')[-1]
     return suffix in lib_suffixes
 
-gnulike_buildtype_args = {'plain': [],
-                          'debug': [],
-                          'debugoptimized': [],
-                          'release': [],
-                          'minsize': [],
-                          'custom': [],
-                          }
-
 armclang_buildtype_args = {'plain': [],
                            'debug': ['-O0', '-g'],
                            'debugoptimized': ['-O1', '-g'],
@@ -168,21 +159,6 @@ pgi_buildtype_args = {'plain': [],
                       'minsize': [],
                       'custom': [],
                       }
-apple_buildtype_linker_args = {'plain': [],
-                               'debug': [],
-                               'debugoptimized': [],
-                               'release': [],
-                               'minsize': [],
-                               'custom': [],
-                               }
-
-gnulike_buildtype_linker_args = {'plain': [],
-                                 'debug': [],
-                                 'debugoptimized': [],
-                                 'release': ['-Wl,-O1'],
-                                 'minsize': [],
-                                 'custom': [],
-                                 }
 
 
 pgi_buildtype_linker_args = {'plain': [],
@@ -256,11 +232,6 @@ 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'],
@@ -282,14 +253,6 @@ clike_optimization_args = {'0': [],
                            's': ['-Os'],
                            }
 
-gnu_optimization_args = {'0': [],
-                         'g': ['-Og'],
-                         '1': ['-O1'],
-                         '2': ['-O2'],
-                         '3': ['-O3'],
-                         's': ['-Os'],
-                         }
-
 cuda_optimization_args = {'0': [],
                           'g': ['-O0'],
                           '1': ['-O1'],
@@ -332,26 +295,6 @@ base_options = {'b_pch': coredata.UserBooleanOption('Use precompiled headers', T
                                                     'from_buildtype'),
                 }
 
-gnulike_instruction_set_args = {'mmx': ['-mmmx'],
-                                'sse': ['-msse'],
-                                'sse2': ['-msse2'],
-                                'sse3': ['-msse3'],
-                                'ssse3': ['-mssse3'],
-                                'sse41': ['-msse4.1'],
-                                'sse42': ['-msse4.2'],
-                                'avx': ['-mavx'],
-                                'avx2': ['-mavx2'],
-                                'neon': ['-mfpu=neon'],
-                                }
-
-gnu_symbol_visibility_args = {'': [],
-                              'default': ['-fvisibility=default'],
-                              'internal': ['-fvisibility=internal'],
-                              'hidden': ['-fvisibility=hidden'],
-                              'protected': ['-fvisibility=protected'],
-                              'inlineshidden': ['-fvisibility=hidden', '-fvisibility-inlines-hidden'],
-                              }
-
 def sanitizer_compile_args(value):
     if value == 'none':
         return []
@@ -1332,32 +1275,6 @@ class CompilerType(enum.Enum):
     def is_windows_compiler(self):
         return self.name in ('GCC_MINGW', 'GCC_CYGWIN', 'CLANG_MINGW', 'ICC_WIN', 'ARM_WIN', 'CCRX_WIN', 'PGI_WIN')
 
-
-def get_macos_dylib_install_name(prefix, shlib_name, suffix, soversion):
-    install_name = prefix + shlib_name
-    if soversion is not None:
-        install_name += '.' + soversion
-    install_name += '.dylib'
-    return '@rpath/' + install_name
-
-def get_gcc_soname_args(compiler_type, prefix, shlib_name, suffix, soversion, darwin_versions, is_shared_module):
-    if compiler_type.is_standard_compiler:
-        sostr = '' if soversion is None else '.' + soversion
-        return ['-Wl,-soname,%s%s.%s%s' % (prefix, shlib_name, suffix, sostr)]
-    elif compiler_type.is_windows_compiler:
-        # For PE/COFF the soname argument has no effect with GNU LD
-        return []
-    elif compiler_type.is_osx_compiler:
-        if is_shared_module:
-            return []
-        name = get_macos_dylib_install_name(prefix, shlib_name, suffix, soversion)
-        args = ['-install_name', name]
-        if darwin_versions:
-            args += ['-compatibility_version', darwin_versions[0], '-current_version', darwin_versions[1]]
-        return args
-    else:
-        raise RuntimeError('Not implemented yet.')
-
 def get_compiler_is_linuxlike(compiler):
     compiler_type = getattr(compiler, 'compiler_type', None)
     return compiler_type and compiler_type.is_standard_compiler
@@ -1396,280 +1313,6 @@ def get_largefile_args(compiler):
         # those features explicitly.
     return []
 
-# TODO: The result from calling compiler should be cached. So that calling this
-# function multiple times don't add latency.
-def gnulike_default_include_dirs(compiler, lang):
-    if lang == 'cpp':
-        lang = 'c++'
-    env = os.environ.copy()
-    env["LC_ALL"] = 'C'
-    cmd = compiler + ['-x{}'.format(lang), '-E', '-v', '-']
-    p = subprocess.Popen(
-        cmd,
-        stdin=subprocess.DEVNULL,
-        stderr=subprocess.PIPE,
-        stdout=subprocess.PIPE,
-        env=env
-    )
-    stderr = p.stderr.read().decode('utf-8', errors='replace')
-    parse_state = 0
-    paths = []
-    for line in stderr.split('\n'):
-        if parse_state == 0:
-            if line == '#include "..." search starts here:':
-                parse_state = 1
-        elif parse_state == 1:
-            if line == '#include <...> search starts here:':
-                parse_state = 2
-            else:
-                paths.append(line[1:])
-        elif parse_state == 2:
-            if line == 'End of search list.':
-                break
-            else:
-                paths.append(line[1:])
-    if not paths:
-        mlog.warning('No include directory found parsing "{cmd}" output'.format(cmd=" ".join(cmd)))
-    return paths
-
-
-class GnuLikeCompiler(abc.ABC):
-    """
-    GnuLikeCompiler is a common interface to all compilers implementing
-    the GNU-style commandline interface. This includes GCC, Clang
-    and ICC. Certain functionality between them is different and requires
-    that the actual concrete subclass define their own implementation.
-    """
-    def __init__(self, compiler_type):
-        self.compiler_type = compiler_type
-        self.base_options = ['b_pch', 'b_lto', 'b_pgo', 'b_sanitize', 'b_coverage',
-                             'b_ndebug', 'b_staticpic', 'b_pie']
-        if (not self.compiler_type.is_osx_compiler and
-                not self.compiler_type.is_windows_compiler and
-                not mesonlib.is_openbsd()):
-            self.base_options.append('b_lundef')
-        if not self.compiler_type.is_windows_compiler:
-            self.base_options.append('b_asneeded')
-        # All GCC-like backends can do assembly
-        self.can_compile_suffixes.add('s')
-
-    def get_asneeded_args(self):
-        # GNU ld cannot be installed on macOS
-        # https://github.com/Homebrew/homebrew-core/issues/17794#issuecomment-328174395
-        # Hence, we don't need to differentiate between OS and ld
-        # for the sake of adding as-needed support
-        if self.compiler_type.is_osx_compiler:
-            return '-Wl,-dead_strip_dylibs'
-        else:
-            return '-Wl,--as-needed'
-
-    def get_pic_args(self):
-        if self.compiler_type.is_osx_compiler or self.compiler_type.is_windows_compiler:
-            return [] # On Window and OS X, pic is always on.
-        return ['-fPIC']
-
-    def get_pie_args(self):
-        return ['-fPIE']
-
-    def get_pie_link_args(self):
-        return ['-pie']
-
-    def get_buildtype_args(self, buildtype):
-        return gnulike_buildtype_args[buildtype]
-
-    @abc.abstractmethod
-    def get_optimization_args(self, optimization_level):
-        raise NotImplementedError("get_optimization_args not implemented")
-
-    def get_debug_args(self, is_debug):
-        return clike_debug_args[is_debug]
-
-    def get_buildtype_linker_args(self, buildtype):
-        if self.compiler_type.is_osx_compiler:
-            return apple_buildtype_linker_args[buildtype]
-        return gnulike_buildtype_linker_args[buildtype]
-
-    @abc.abstractmethod
-    def get_pch_suffix(self):
-        raise NotImplementedError("get_pch_suffix not implemented")
-
-    def split_shlib_to_parts(self, fname):
-        return os.path.dirname(fname), fname
-
-    def get_soname_args(self, *args):
-        return get_gcc_soname_args(self.compiler_type, *args)
-
-    def get_std_shared_lib_link_args(self):
-        return ['-shared']
-
-    def get_std_shared_module_link_args(self, options):
-        if self.compiler_type.is_osx_compiler:
-            return ['-bundle', '-Wl,-undefined,dynamic_lookup']
-        return ['-shared']
-
-    def get_link_whole_for(self, args):
-        if self.compiler_type.is_osx_compiler:
-            result = []
-            for a in args:
-                result += ['-Wl,-force_load', a]
-            return result
-        return ['-Wl,--whole-archive'] + args + ['-Wl,--no-whole-archive']
-
-    def get_instruction_set_args(self, instruction_set):
-        return gnulike_instruction_set_args.get(instruction_set, None)
-
-    def get_default_include_dirs(self):
-        return gnulike_default_include_dirs(self.exelist, self.language)
-
-    @abc.abstractmethod
-    def openmp_flags(self):
-        raise NotImplementedError("openmp_flags not implemented")
-
-    def gnu_symbol_visibility_args(self, vistype):
-        return gnu_symbol_visibility_args[vistype]
-
-    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.compiler_type.is_windows_compiler:
-            return [defsfile]
-        # For other targets, discard the .def file.
-        return []
-
-    def get_argument_syntax(self):
-        return 'gcc'
-
-    def get_profile_generate_args(self):
-        return ['-fprofile-generate']
-
-    def get_profile_use_args(self):
-        return ['-fprofile-use', '-fprofile-correction']
-
-    def get_allow_undefined_link_args(self):
-        if self.compiler_type.is_osx_compiler:
-            # Apple ld
-            return ['-Wl,-undefined,dynamic_lookup']
-        elif self.compiler_type.is_windows_compiler:
-            # For PE/COFF this is impossible
-            return []
-        elif mesonlib.is_sunos():
-            return []
-        else:
-            # GNU ld and LLVM lld
-            return ['-Wl,--allow-shlib-undefined']
-
-    def get_gui_app_args(self, value):
-        if self.compiler_type.is_windows_compiler:
-            return ['-mwindows' if value else '-mconsole']
-        return []
-
-    def compute_parameters_with_absolute_paths(self, parameter_list, build_dir):
-        for idx, i in enumerate(parameter_list):
-            if i[:2] == '-I' or i[:2] == '-L':
-                parameter_list[idx] = i[:2] + os.path.normpath(os.path.join(build_dir, i[2:]))
-
-        return parameter_list
-
-    @functools.lru_cache()
-    def _get_search_dirs(self, env):
-        extra_args = ['--print-search-dirs']
-        stdo = None
-        with self._build_wrapper('', env, extra_args=extra_args,
-                                 dependencies=None, mode='compile',
-                                 want_output=True) as p:
-            stdo = p.stdo
-        return stdo
-
-    def _split_fetch_real_dirs(self, pathstr):
-        # We need to use the path separator used by the compiler for printing
-        # lists of paths ("gcc --print-search-dirs"). By default
-        # we assume it uses the platform native separator.
-        pathsep = os.pathsep
-
-        # clang uses ':' instead of ';' on Windows https://reviews.llvm.org/D61121
-        # so we need to repair things like 'C:\foo:C:\bar'
-        if pathsep == ';':
-            pathstr = re.sub(r':([^/\\])', r';\1', pathstr)
-
-        # pathlib treats empty paths as '.', so filter those out
-        paths = [p for p in pathstr.split(pathsep) if p]
-
-        result = []
-        for p in paths:
-            # GCC returns paths like this:
-            # /usr/lib/gcc/x86_64-linux-gnu/8/../../../../x86_64-linux-gnu/lib
-            # It would make sense to normalize them to get rid of the .. parts
-            # Sadly when you are on a merged /usr fs it also kills these:
-            # /lib/x86_64-linux-gnu
-            # since /lib is a symlink to /usr/lib. This would mean
-            # paths under /lib would be considered not a "system path",
-            # which is wrong and breaks things. Store everything, just to be sure.
-            pobj = Path(p)
-            unresolved = pobj.as_posix()
-            if pobj.exists():
-                if unresolved not in result:
-                    result.append(unresolved)
-                try:
-                    resolved = Path(p).resolve().as_posix()
-                    if resolved not in result:
-                        result.append(resolved)
-                except FileNotFoundError:
-                    pass
-        return tuple(result)
-
-    def get_compiler_dirs(self, env, name):
-        '''
-        Get dirs from the compiler, either `libraries:` or `programs:`
-        '''
-        stdo = self._get_search_dirs(env)
-        for line in stdo.split('\n'):
-            if line.startswith(name + ':'):
-                return self._split_fetch_real_dirs(line.split('=', 1)[1])
-        return ()
-
-
-class GnuCompiler(GnuLikeCompiler):
-    """
-    GnuCompiler represents an actual GCC in its many incarnations.
-    Compilers imitating GCC (Clang/Intel) should use the GnuLikeCompiler ABC.
-    """
-    def __init__(self, compiler_type, defines: dict):
-        super().__init__(compiler_type)
-        self.id = 'gcc'
-        self.defines = defines or {}
-        self.base_options.append('b_colorout')
-
-    def get_colorout_args(self, colortype: str) -> List[str]:
-        if mesonlib.version_compare(self.version, '>=4.9.0'):
-            return gnu_color_args[colortype][:]
-        return []
-
-    def get_warn_args(self, level: str) -> list:
-        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: str) -> bool:
-        return define in self.defines
-
-    def get_builtin_define(self, define):
-        if define in self.defines:
-            return self.defines[define]
-
-    def get_optimization_args(self, optimization_level: str):
-        return gnu_optimization_args[optimization_level]
-
-    def get_pch_suffix(self) -> str:
-        return 'gch'
-
-    def openmp_flags(self) -> List[str]:
-        return ['-fopenmp']
-
 
 class PGICompiler:
     def __init__(self, compiler_type):
diff --git a/mesonbuild/compilers/cpp.py b/mesonbuild/compilers/cpp.py
index cf893b9..67a5748 100644
--- a/mesonbuild/compilers/cpp.py
+++ b/mesonbuild/compilers/cpp.py
@@ -25,7 +25,6 @@ from .compilers import (
     gnu_winlibs,
     msvc_winlibs,
     ClangCompiler,
-    GnuCompiler,
     ElbrusCompiler,
     IntelGnuLikeCompiler,
     IntelVisualStudioLikeCompiler,
@@ -38,6 +37,7 @@ from .mixins.clike import CLikeCompiler
 from .mixins.ccrx import CcrxCompiler
 from .mixins.arm import ArmCompiler
 from .mixins.visualstudio import VisualStudioLikeCompiler
+from .mixins.gnu import GnuCompiler
 
 
 def non_msvc_eh_options(eh, args):
diff --git a/mesonbuild/compilers/cuda.py b/mesonbuild/compilers/cuda.py
index 3c38c09..152c8ba 100644
--- a/mesonbuild/compilers/cuda.py
+++ b/mesonbuild/compilers/cuda.py
@@ -17,7 +17,8 @@ import re, os.path
 from .. import mlog
 from ..mesonlib import EnvironmentException, MachineChoice, Popen_safe
 from .compilers import (Compiler, cuda_buildtype_args, cuda_optimization_args,
-                        cuda_debug_args, CompilerType, get_gcc_soname_args)
+                        cuda_debug_args, CompilerType)
+from .mixins.gnu import get_gcc_soname_args
 
 class CudaCompiler(Compiler):
     def __init__(self, exelist, version, for_machine: MachineChoice, is_cross, exe_wrapper=None):
diff --git a/mesonbuild/compilers/d.py b/mesonbuild/compilers/d.py
index 9d9863b..1a37c63 100644
--- a/mesonbuild/compilers/d.py
+++ b/mesonbuild/compilers/d.py
@@ -23,13 +23,11 @@ from .compilers import (
     d_dmd_buildtype_args,
     d_gdc_buildtype_args,
     d_ldc_buildtype_args,
-    get_gcc_soname_args,
-    gnu_color_args,
-    gnu_optimization_args,
     clike_debug_args,
     Compiler,
     CompilerArgs,
 )
+from .mixins.gnu import get_gcc_soname_args, gnu_color_args, gnu_optimization_args
 
 d_feature_args = {'gcc':  {'unittest': '-funittest',
                            'debug': '-fdebug',
diff --git a/mesonbuild/compilers/fortran.py b/mesonbuild/compilers/fortran.py
index e96cb15..12f2dbf 100644
--- a/mesonbuild/compilers/fortran.py
+++ b/mesonbuild/compilers/fortran.py
@@ -17,13 +17,8 @@ from pathlib import Path
 
 from .compilers import (
     CompilerType,
-    apple_buildtype_linker_args,
-    gnulike_buildtype_args,
-    gnulike_buildtype_linker_args,
-    gnu_optimization_args,
     clike_debug_args,
     Compiler,
-    GnuCompiler,
     ClangCompiler,
     ElbrusCompiler,
     IntelGnuLikeCompiler,
@@ -31,6 +26,10 @@ from .compilers import (
     IntelVisualStudioLikeCompiler,
 )
 from .mixins.clike import CLikeCompiler
+from .mixins.gnu import (
+    GnuCompiler, apple_buildtype_linker_args, gnulike_buildtype_args,
+    gnulike_buildtype_linker_args, gnu_optimization_args,
+)
 from .. import mlog
 
 from mesonbuild.mesonlib import (
diff --git a/mesonbuild/compilers/mixins/gnu.py b/mesonbuild/compilers/mixins/gnu.py
new file mode 100644
index 0000000..6095483
--- /dev/null
+++ b/mesonbuild/compilers/mixins/gnu.py
@@ -0,0 +1,390 @@
+# Copyright 2019 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.
+
+"""Provides mixins for GNU compilers and GNU-like compilers."""
+
+import abc
+import functools
+import os
+import pathlib
+import subprocess
+import typing
+
+from ... import mesonlib
+from ... import mlog
+
+# XXX: prevent circular references.
+# FIXME: this really is a posix interface not a c-like interface
+clike_debug_args = {False: [],
+                    True: ['-g']}
+
+gnulike_buildtype_args = {'plain': [],
+                          'debug': [],
+                          'debugoptimized': [],
+                          'release': [],
+                          'minsize': [],
+                          'custom': [],
+                          }
+
+apple_buildtype_linker_args = {'plain': [],
+                               'debug': [],
+                               'debugoptimized': [],
+                               'release': [],
+                               'minsize': [],
+                               'custom': [],
+                               }
+
+gnulike_buildtype_linker_args = {'plain': [],
+                                 'debug': [],
+                                 'debugoptimized': [],
+                                 'release': ['-Wl,-O1'],
+                                 'minsize': [],
+                                 'custom': [],
+                                 }
+
+gnu_optimization_args = {'0': [],
+                         'g': ['-Og'],
+                         '1': ['-O1'],
+                         '2': ['-O2'],
+                         '3': ['-O3'],
+                         's': ['-Os'],
+                         }
+
+gnulike_instruction_set_args = {'mmx': ['-mmmx'],
+                                'sse': ['-msse'],
+                                'sse2': ['-msse2'],
+                                'sse3': ['-msse3'],
+                                'ssse3': ['-mssse3'],
+                                'sse41': ['-msse4.1'],
+                                'sse42': ['-msse4.2'],
+                                'avx': ['-mavx'],
+                                'avx2': ['-mavx2'],
+                                'avx2': ['-mavx2'],
+                                'neon': ['-mfpu=neon'],
+                                }
+
+gnu_symbol_visibility_args = {'': [],
+                              'default': ['-fvisibility=default'],
+                              'internal': ['-fvisibility=internal'],
+                              'hidden': ['-fvisibility=hidden'],
+                              'protected': ['-fvisibility=protected'],
+                              'inlineshidden': ['-fvisibility=hidden', '-fvisibility-inlines-hidden'],
+                              }
+
+gnu_color_args = {'auto': ['-fdiagnostics-color=auto'],
+                  'always': ['-fdiagnostics-color=always'],
+                  'never': ['-fdiagnostics-color=never'],
+                  }
+
+
+def get_macos_dylib_install_name(prefix, shlib_name, suffix, soversion):
+    install_name = prefix + shlib_name
+    if soversion is not None:
+        install_name += '.' + soversion
+    install_name += '.dylib'
+    return '@rpath/' + install_name
+
+
+def get_gcc_soname_args(compiler_type, prefix, shlib_name, suffix, soversion, darwin_versions, is_shared_module):
+    if compiler_type.is_standard_compiler:
+        sostr = '' if soversion is None else '.' + soversion
+        return ['-Wl,-soname,%s%s.%s%s' % (prefix, shlib_name, suffix, sostr)]
+    elif compiler_type.is_windows_compiler:
+        # For PE/COFF the soname argument has no effect with GNU LD
+        return []
+    elif compiler_type.is_osx_compiler:
+        if is_shared_module:
+            return []
+        name = get_macos_dylib_install_name(prefix, shlib_name, suffix, soversion)
+        args = ['-install_name', name]
+        if darwin_versions:
+            args += ['-compatibility_version', darwin_versions[0], '-current_version', darwin_versions[1]]
+        return args
+    else:
+        raise RuntimeError('Not implemented yet.')
+
+
+# TODO: The result from calling compiler should be cached. So that calling this
+# function multiple times don't add latency.
+def gnulike_default_include_dirs(compiler, lang):
+    if lang == 'cpp':
+        lang = 'c++'
+    env = os.environ.copy()
+    env["LC_ALL"] = 'C'
+    cmd = compiler + ['-x{}'.format(lang), '-E', '-v', '-']
+    p = subprocess.Popen(
+        cmd,
+        stdin=subprocess.DEVNULL,
+        stderr=subprocess.PIPE,
+        stdout=subprocess.PIPE,
+        env=env
+    )
+    stderr = p.stderr.read().decode('utf-8', errors='replace')
+    parse_state = 0
+    paths = []
+    for line in stderr.split('\n'):
+        if parse_state == 0:
+            if line == '#include "..." search starts here:':
+                parse_state = 1
+        elif parse_state == 1:
+            if line == '#include <...> search starts here:':
+                parse_state = 2
+            else:
+                paths.append(line[1:])
+        elif parse_state == 2:
+            if line == 'End of search list.':
+                break
+            else:
+                paths.append(line[1:])
+    if not paths:
+        mlog.warning('No include directory found parsing "{cmd}" output'.format(cmd=" ".join(cmd)))
+    return paths
+
+
+class GnuLikeCompiler(metaclass=abc.ABCMeta):
+    """
+    GnuLikeCompiler is a common interface to all compilers implementing
+    the GNU-style commandline interface. This includes GCC, Clang
+    and ICC. Certain functionality between them is different and requires
+    that the actual concrete subclass define their own implementation.
+    """
+    def __init__(self, compiler_type):
+        self.compiler_type = compiler_type
+        self.base_options = ['b_pch', 'b_lto', 'b_pgo', 'b_sanitize', 'b_coverage',
+                             'b_ndebug', 'b_staticpic', 'b_pie']
+        if (not self.compiler_type.is_osx_compiler and
+                not self.compiler_type.is_windows_compiler and
+                not mesonlib.is_openbsd()):
+            self.base_options.append('b_lundef')
+        if not self.compiler_type.is_windows_compiler:
+            self.base_options.append('b_asneeded')
+        # All GCC-like backends can do assembly
+        self.can_compile_suffixes.add('s')
+
+    def get_asneeded_args(self):
+        # GNU ld cannot be installed on macOS
+        # https://github.com/Homebrew/homebrew-core/issues/17794#issuecomment-328174395
+        # Hence, we don't need to differentiate between OS and ld
+        # for the sake of adding as-needed support
+        if self.compiler_type.is_osx_compiler:
+            return '-Wl,-dead_strip_dylibs'
+        else:
+            return '-Wl,--as-needed'
+
+    def get_pic_args(self):
+        if self.compiler_type.is_osx_compiler or self.compiler_type.is_windows_compiler:
+            return [] # On Window and OS X, pic is always on.
+        return ['-fPIC']
+
+    def get_pie_args(self):
+        return ['-fPIE']
+
+    def get_pie_link_args(self):
+        return ['-pie']
+
+    def get_buildtype_args(self, buildtype):
+        return gnulike_buildtype_args[buildtype]
+
+    @abc.abstractmethod
+    def get_optimization_args(self, optimization_level):
+        raise NotImplementedError("get_optimization_args not implemented")
+
+    def get_debug_args(self, is_debug):
+        return clike_debug_args[is_debug]
+
+    def get_buildtype_linker_args(self, buildtype):
+        if self.compiler_type.is_osx_compiler:
+            return apple_buildtype_linker_args[buildtype]
+        return gnulike_buildtype_linker_args[buildtype]
+
+    @abc.abstractmethod
+    def get_pch_suffix(self):
+        raise NotImplementedError("get_pch_suffix not implemented")
+
+    def split_shlib_to_parts(self, fname):
+        return os.path.dirname(fname), fname
+
+    def get_soname_args(self, *args):
+        return get_gcc_soname_args(self.compiler_type, *args)
+
+    def get_std_shared_lib_link_args(self):
+        return ['-shared']
+
+    def get_std_shared_module_link_args(self, options):
+        if self.compiler_type.is_osx_compiler:
+            return ['-bundle', '-Wl,-undefined,dynamic_lookup']
+        return ['-shared']
+
+    def get_link_whole_for(self, args):
+        if self.compiler_type.is_osx_compiler:
+            result = []
+            for a in args:
+                result += ['-Wl,-force_load', a]
+            return result
+        return ['-Wl,--whole-archive'] + args + ['-Wl,--no-whole-archive']
+
+    def get_instruction_set_args(self, instruction_set):
+        return gnulike_instruction_set_args.get(instruction_set, None)
+
+    def get_default_include_dirs(self):
+        return gnulike_default_include_dirs(self.exelist, self.language)
+
+    @abc.abstractmethod
+    def openmp_flags(self):
+        raise NotImplementedError("openmp_flags not implemented")
+
+    def gnu_symbol_visibility_args(self, vistype):
+        return gnu_symbol_visibility_args[vistype]
+
+    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.compiler_type.is_windows_compiler:
+            return [defsfile]
+        # For other targets, discard the .def file.
+        return []
+
+    def get_argument_syntax(self):
+        return 'gcc'
+
+    def get_profile_generate_args(self):
+        return ['-fprofile-generate']
+
+    def get_profile_use_args(self):
+        return ['-fprofile-use', '-fprofile-correction']
+
+    def get_allow_undefined_link_args(self):
+        if self.compiler_type.is_osx_compiler:
+            # Apple ld
+            return ['-Wl,-undefined,dynamic_lookup']
+        elif self.compiler_type.is_windows_compiler:
+            # For PE/COFF this is impossible
+            return []
+        elif mesonlib.is_sunos():
+            return []
+        else:
+            # GNU ld and LLVM lld
+            return ['-Wl,--allow-shlib-undefined']
+
+    def get_gui_app_args(self, value):
+        if self.compiler_type.is_windows_compiler:
+            return ['-mwindows' if value else '-mconsole']
+        return []
+
+    def compute_parameters_with_absolute_paths(self, parameter_list, build_dir):
+        for idx, i in enumerate(parameter_list):
+            if i[:2] == '-I' or i[:2] == '-L':
+                parameter_list[idx] = i[:2] + os.path.normpath(os.path.join(build_dir, i[2:]))
+
+        return parameter_list
+
+    @functools.lru_cache()
+    def _get_search_dirs(self, env):
+        extra_args = ['--print-search-dirs']
+        stdo = None
+        with self._build_wrapper('', env, extra_args=extra_args,
+                                 dependencies=None, mode='compile',
+                                 want_output=True) as p:
+            stdo = p.stdo
+        return stdo
+
+    def _split_fetch_real_dirs(self, pathstr):
+        # We need to use the path separator used by the compiler for printing
+        # lists of paths ("gcc --print-search-dirs"). By default
+        # we assume it uses the platform native separator.
+        pathsep = os.pathsep
+
+        # clang uses ':' instead of ';' on Windows https://reviews.llvm.org/D61121
+        # so we need to repair things like 'C:\foo:C:\bar'
+        if pathsep == ';':
+            pathstr = re.sub(r':([^/\\])', r';\1', pathstr)
+
+        # pathlib treats empty paths as '.', so filter those out
+        paths = [p for p in pathstr.split(pathsep) if p]
+
+        result = []
+        for p in paths:
+            # GCC returns paths like this:
+            # /usr/lib/gcc/x86_64-linux-gnu/8/../../../../x86_64-linux-gnu/lib
+            # It would make sense to normalize them to get rid of the .. parts
+            # Sadly when you are on a merged /usr fs it also kills these:
+            # /lib/x86_64-linux-gnu
+            # since /lib is a symlink to /usr/lib. This would mean
+            # paths under /lib would be considered not a "system path",
+            # which is wrong and breaks things. Store everything, just to be sure.
+            pobj = pathlib.Path(p)
+            unresolved = pobj.as_posix()
+            if pobj.exists():
+                if unresolved not in result:
+                    result.append(unresolved)
+                try:
+                    resolved = pathlib.Path(p).resolve().as_posix()
+                    if resolved not in result:
+                        result.append(resolved)
+                except FileNotFoundError:
+                    pass
+        return tuple(result)
+
+    def get_compiler_dirs(self, env, name):
+        '''
+        Get dirs from the compiler, either `libraries:` or `programs:`
+        '''
+        stdo = self._get_search_dirs(env)
+        for line in stdo.split('\n'):
+            if line.startswith(name + ':'):
+                return self._split_fetch_real_dirs(line.split('=', 1)[1])
+        return ()
+
+
+class GnuCompiler(GnuLikeCompiler):
+    """
+    GnuCompiler represents an actual GCC in its many incarnations.
+    Compilers imitating GCC (Clang/Intel) should use the GnuLikeCompiler ABC.
+    """
+    def __init__(self, compiler_type, defines: dict):
+        super().__init__(compiler_type)
+        self.id = 'gcc'
+        self.defines = defines or {}
+        self.base_options.append('b_colorout')
+
+    def get_colorout_args(self, colortype: str) -> typing.List[str]:
+        if mesonlib.version_compare(self.version, '>=4.9.0'):
+            return gnu_color_args[colortype][:]
+        return []
+
+    def get_warn_args(self, level: str) -> list:
+        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: str) -> bool:
+        return define in self.defines
+
+    def get_builtin_define(self, define):
+        if define in self.defines:
+            return self.defines[define]
+
+    def get_optimization_args(self, optimization_level: str):
+        return gnu_optimization_args[optimization_level]
+
+    def get_pch_suffix(self) -> str:
+        return 'gch'
+
+    def openmp_flags(self) -> typing.List[str]:
+        return ['-fopenmp']
diff --git a/mesonbuild/compilers/objc.py b/mesonbuild/compilers/objc.py
index 44c414a..ec4aa1a 100644
--- a/mesonbuild/compilers/objc.py
+++ b/mesonbuild/compilers/objc.py
@@ -17,8 +17,9 @@ import typing
 
 from ..mesonlib import EnvironmentException, MachineChoice
 
+from .compilers import Compiler, ClangCompiler
 from .mixins.clike import CLikeCompiler
-from .compilers import Compiler, ClangCompiler, GnuCompiler
+from .mixins.gnu import GnuCompiler
 
 class ObjCCompiler(CLikeCompiler, Compiler):
     def __init__(self, exelist, version, for_machine: MachineChoice, is_cross: bool, exe_wrap: typing.Optional[str]):
diff --git a/mesonbuild/compilers/objcpp.py b/mesonbuild/compilers/objcpp.py
index 3a232b5..38082d2 100644
--- a/mesonbuild/compilers/objcpp.py
+++ b/mesonbuild/compilers/objcpp.py
@@ -18,7 +18,8 @@ import typing
 from ..mesonlib import EnvironmentException, MachineChoice
 
 from .mixins.clike import CLikeCompiler
-from .compilers import Compiler, ClangCompiler, GnuCompiler
+from .compilers import Compiler, ClangCompiler
+from .mixins.gnu import GnuCompiler
 
 class ObjCPPCompiler(CLikeCompiler, Compiler):
     def __init__(self, exelist, version, for_machine: MachineChoice, is_cross: bool, exe_wrap: typing.Optional[str]):