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author	Jussi Pakkanen <jpakkane@gmail.com>	2017-06-12 21:47:22 +0300
committer	Jussi Pakkanen <jpakkane@gmail.com>	2017-06-12 21:47:22 +0300
commit	93681b013742ecb9de9f2e4739d333248c5d0f87 (patch)
tree	39457023b13b0155abcf434fada93c01d5b4ebf7
parent	1944a7a66d594b60eea32f76e049810d8adb0ed5 (diff)
download	meson-93681b013742ecb9de9f2e4739d333248c5d0f87.zip meson-93681b013742ecb9de9f2e4739d333248c5d0f87.tar.gz meson-93681b013742ecb9de9f2e4739d333248c5d0f87.tar.bz2

Updated version number for release.0.41.0

Diffstat

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man/meson.1

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man/mesonconf.1

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man/mesonintrospect.1

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man/mesontest.1

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man/wraptool.1

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mesonbuild/coredata.py

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# 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 os
import re
import shlex
import pickle
import subprocess
from collections import OrderedDict
import itertools
from pathlib import PurePath

from . import backends
from .. import modules
from .. import environment, mesonlib
from .. import build
from .. import mlog
from .. import dependencies
from .. import compilers
from ..compilers import CompilerArgs, CCompiler
from ..linkers import ArLinker
from ..mesonlib import File, MesonException, OrderedSet
from ..mesonlib import get_compiler_for_source, has_path_sep
from .backends import CleanTrees, InstallData, TargetInstallData
from ..build import InvalidArguments

if mesonlib.is_windows():
    quote_func = lambda s: '"{}"'.format(s)
    execute_wrapper = 'cmd /c'
    rmfile_prefix = 'del /f /s /q {} &&'
else:
    quote_func = shlex.quote
    execute_wrapper = ''
    rmfile_prefix = 'rm -f {} &&'

def ninja_quote(text, is_build_line=False):
    if is_build_line:
        qcs = ('$', ' ', ':')
    else:
        qcs = ('$', ' ')
    for char in qcs:
        text = text.replace(char, '$' + char)
    if '\n' in text:
        errmsg = '''Ninja does not support newlines in rules. The content was:

%s

Please report this error with a test case to the Meson bug tracker.''' % text
        raise MesonException(errmsg)
    return text


class NinjaBuildElement:
    def __init__(self, all_outputs, outfilenames, rule, infilenames):
        if isinstance(outfilenames, str):
            self.outfilenames = [outfilenames]
        else:
            self.outfilenames = outfilenames
        assert(isinstance(rule, str))
        self.rule = rule
        if isinstance(infilenames, str):
            self.infilenames = [infilenames]
        else:
            self.infilenames = infilenames
        self.deps = OrderedSet()
        self.orderdeps = OrderedSet()
        self.elems = []
        self.all_outputs = all_outputs

    def add_dep(self, dep):
        if isinstance(dep, list):
            self.deps.update(dep)
        else:
            self.deps.add(dep)

    def add_orderdep(self, dep):
        if isinstance(dep, list):
            self.orderdeps.update(dep)
        else:
            self.orderdeps.add(dep)

    def add_item(self, name, elems):
        if isinstance(elems, str):
            elems = [elems]
        self.elems.append((name, elems))

    def write(self, outfile):
        self.check_outputs()
        line = 'build %s: %s %s' % (' '.join([ninja_quote(i, True) for i in self.outfilenames]),
                                    self.rule,
                                    ' '.join([ninja_quote(i, True) for i in self.infilenames]))
        if len(self.deps) > 0:
            line += ' | ' + ' '.join([ninja_quote(x, True) for x in self.deps])
        if len(self.orderdeps) > 0:
            line += ' || ' + ' '.join([ninja_quote(x, True) for x in self.orderdeps])
        line += '\n'
        # This is the only way I could find to make this work on all
        # platforms including Windows command shell. Slash is a dir separator
        # on Windows, too, so all characters are unambiguous and, more importantly,
        # do not require quoting, unless explicitely specified, which is necessary for
        # the csc compiler.
        line = line.replace('\\', '/')
        outfile.write(line)

        # All the entries that should remain unquoted
        raw_names = {'DEPFILE', 'DESC', 'pool', 'description'}

        for e in self.elems:
            (name, elems) = e
            should_quote = name not in raw_names
            line = ' %s = ' % name
            newelems = []
            for i in elems:
                if not should_quote or i == '&&': # Hackety hack hack
                    quoter = ninja_quote
                else:
                    quoter = lambda x: ninja_quote(quote_func(x))
                i = i.replace('\\', '\\\\')
                if quote_func('') == '""':
                    i = i.replace('"', '\\"')
                newelems.append(quoter(i))
            line += ' '.join(newelems)
            line += '\n'
            outfile.write(line)
        outfile.write('\n')

    def check_outputs(self):
        for n in self.outfilenames:
            if n in self.all_outputs:
                raise MesonException('Multiple producers for Ninja target "%s". Please rename your targets.' % n)
            self.all_outputs[n] = True

class NinjaBackend(backends.Backend):

    def __init__(self, build):
        super().__init__(build)
        self.name = 'ninja'
        self.ninja_filename = 'build.ninja'
        self.target_arg_cache = {}
        self.fortran_deps = {}
        self.all_outputs = {}

    def create_target_alias(self, to_target, outfile):
        # We need to use aliases for targets that might be used as directory
        # names to workaround a Ninja bug that breaks `ninja -t clean`.
        # This is used for 'reserved' targets such as 'test', 'install',
        # 'benchmark', etc, and also for RunTargets.
        # https://github.com/mesonbuild/meson/issues/1644
        if not to_target.startswith('meson-'):
            m = 'Invalid usage of create_target_alias with {!r}'
            raise AssertionError(m.format(to_target))
        from_target = to_target[len('meson-'):]
        elem = NinjaBuildElement(self.all_outputs, from_target, 'phony', to_target)
        elem.write(outfile)

    def detect_vs_dep_prefix(self, tempfilename):
        '''VS writes its dependency in a locale dependent format.
        Detect the search prefix to use.'''
        for compiler in self.build.compilers.values():
            # Have to detect the dependency format
            if compiler.id == 'msvc':
                break
        else:
            # None of our compilers are MSVC, we're done.
            return open(tempfilename, 'a', encoding='utf-8')
        filename = os.path.join(self.environment.get_scratch_dir(),
                                'incdetect.c')
        with open(filename, 'w') as f:
            f.write('''#include<stdio.h>
int dummy;
''')

        # The output of cl dependency information is language
        # and locale dependent. Any attempt at converting it to
        # Python strings leads to failure. We _must_ do this detection
        # in raw byte mode and write the result in raw bytes.
        pc = subprocess.Popen(['cl', '/showIncludes', '/c', 'incdetect.c'],
                              cwd=self.environment.get_scratch_dir(),
                              stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        (stdo, _) = pc.communicate()

        # We want to match 'Note: including file: ' in the line
        # 'Note: including file: d:\MyDir\include\stdio.h', however
        # different locales have different messages with a different
        # number of colons. Match up to the the drive name 'd:\'.
        matchre = re.compile(rb"^(.*\s)[a-zA-Z]:\\.*stdio.h$")
        for line in stdo.split(b'\r\n'):
            match = matchre.match(line)
            if match:
                with open(tempfilename, 'ab') as binfile:
                    binfile.write(b'msvc_deps_prefix = ' + match.group(1) + b'\n')
                return open(tempfilename, 'a', encoding='utf-8')
        raise MesonException('Could not determine vs dep dependency prefix string.')

    def generate(self, interp):
        self.interpreter = interp
        self.ninja_command = environment.detect_ninja(log=True)
        if self.ninja_command is None:
            raise MesonException('Could not detect Ninja v1.5 or newer')
        outfilename = os.path.join(self.environment.get_build_dir(), self.ninja_filename)
        tempfilename = outfilename + '~'
        with open(tempfilename, 'w', encoding='utf-8') as outfile:
            outfile.write('# This is the build file for project "%s"\n' %
                          self.build.get_project())
            outfile.write('# It is autogenerated by the Meson build system.\n')
            outfile.write('# Do not edit by hand.\n\n')
            outfile.write('ninja_required_version = 1.5.1\n\n')
        with self.detect_vs_dep_prefix(tempfilename) as outfile:
            self.generate_rules(outfile)
            self.generate_phony(outfile)
            outfile.write('# Build rules for targets\n\n')
            for t in self.build.get_targets().values():
                self.generate_target(t, outfile)
            outfile.write('# Test rules\n\n')
            self.generate_tests(outfile)
            outfile.write('# Install rules\n\n')
            self.generate_install(outfile)
            self.generate_dist(outfile)
            if 'b_coverage' in self.environment.coredata.base_options and \
                    self.environment.coredata.base_options['b_coverage'].value:
                outfile.write('# Coverage rules\n\n')
                self.generate_coverage_rules(outfile)
            outfile.write('# Suffix\n\n')
            self.generate_utils(outfile)
            self.generate_ending(outfile)
        # Only overwrite the old build file after the new one has been
        # fully created.
        os.replace(tempfilename, outfilename)
        self.generate_compdb()

    # http://clang.llvm.org/docs/JSONCompilationDatabase.html
    def generate_compdb(self):
        pch_compilers = ['%s_PCH' % i for i in self.build.compilers]
        native_compilers = ['%s_COMPILER' % i for i in self.build.compilers]
        cross_compilers = ['%s_CROSS_COMPILER' % i for i in self.build.cross_compilers]
        ninja_compdb = [self.ninja_command, '-t', 'compdb'] + pch_compilers + native_compilers + cross_compilers
        builddir = self.environment.get_build_dir()
        try:
            jsondb = subprocess.check_output(ninja_compdb, cwd=builddir)
            with open(os.path.join(builddir, 'compile_commands.json'), 'wb') as f:
                f.write(jsondb)
        except Exception:
            mlog.warning('Could not create compilation database.')

    # Get all generated headers. Any source file might need them so
    # we need to add an order dependency to them.
    def get_generated_headers(self, target):
        if hasattr(target, 'cached_generated_headers'):
            return target.cached_generated_headers
        header_deps = []
        # XXX: Why don't we add deps to CustomTarget headers here?
        for genlist in target.get_generated_sources():
            if isinstance(genlist, (build.CustomTarget, build.CustomTargetIndex)):
                continue
            for src in genlist.get_outputs():
                if self.environment.is_header(src):
                    header_deps.append(self.get_target_generated_dir(target, genlist, src))
        if 'vala' in target.compilers and not isinstance(target, build.Executable):
            vala_header = File.from_built_file(self.get_target_dir(target), target.vala_header)
            header_deps.append(vala_header)
        # Recurse and find generated headers
        for dep in itertools.chain(target.link_targets, target.link_whole_targets):
            if isinstance(dep, (build.StaticLibrary, build.SharedLibrary)):
                header_deps += self.get_generated_headers(dep)
        target.cached_generated_headers = header_deps
        return header_deps

    def get_target_generated_sources(self, target):
        """
        Returns a dictionary with the keys being the path to the file
        (relative to the build directory) of that type and the value
        being the GeneratorList or CustomTarget that generated it.
        """
        srcs = OrderedDict()
        for gensrc in target.get_generated_sources():
            for s in gensrc.get_outputs():
                f = self.get_target_generated_dir(target, gensrc, s)
                srcs[f] = s
        return srcs

    def get_target_sources(self, target):
        srcs = OrderedDict()
        for s in target.get_sources():
            # BuildTarget sources are always mesonlib.File files which are
            # either in the source root, or generated with configure_file and
            # in the build root
            if not isinstance(s, File):
                raise InvalidArguments('All sources in target {!r} must be of type mesonlib.File'.format(s))
            f = s.rel_to_builddir(self.build_to_src)
            srcs[f] = s
        return srcs

    # Languages that can mix with C or C++ but don't support unity builds yet
    # because the syntax we use for unity builds is specific to C/++/ObjC/++.
    # Assembly files cannot be unitified and neither can LLVM IR files
    langs_cant_unity = ('d', 'fortran')

    def get_target_source_can_unity(self, target, source):
        if isinstance(source, File):
            source = source.fname
        if self.environment.is_llvm_ir(source) or \
           self.environment.is_assembly(source):
            return False
        suffix = os.path.splitext(source)[1][1:]
        for lang in self.langs_cant_unity:
            if lang not in target.compilers:
                continue
            if suffix in target.compilers[lang].file_suffixes:
                return False
        return True

    def generate_target(self, target, outfile):
        if isinstance(target, build.CustomTarget):
            self.generate_custom_target(target, outfile)
        if isinstance(target, build.RunTarget):
            self.generate_run_target(target, outfile)
        name = target.get_id()
        if name in self.processed_targets:
            return
        self.processed_targets[name] = True
        # Generate rules for all dependency targets
        self.process_target_dependencies(target, outfile)
        # If target uses a language that cannot link to C objects,
        # just generate for that language and return.
        if isinstance(target, build.Jar):
            self.generate_jar_target(target, outfile)
            return
        if 'rust' in target.compilers:
            self.generate_rust_target(target, outfile)
            return
        if 'cs' in target.compilers:
            self.generate_cs_target(target, outfile)
            return
        if 'swift' in target.compilers:
            self.generate_swift_target(target, outfile)
            return

        # Now we handle the following languages:
        # ObjC++, ObjC, C++, C, D, Fortran, Vala

        # target_sources:
        #   Pre-existing target C/C++ sources to be built; dict of full path to
        #   source relative to build root and the original File object.
        # generated_sources:
        #   GeneratedList and CustomTarget sources to be built; dict of the full
        #   path to source relative to build root and the generating target/list
        # vala_generated_sources:
        #   Array of sources generated by valac that have to be compiled
        if 'vala' in target.compilers:
            # Sources consumed by valac are filtered out. These only contain
            # C/C++ sources, objects, generated libs, and unknown sources now.
            target_sources, generated_sources, \
                vala_generated_sources = self.generate_vala_compile(target, outfile)
        else:
            target_sources = self.get_target_sources(target)
            generated_sources = self.get_target_generated_sources(target)
            vala_generated_sources = []
        self.scan_fortran_module_outputs(target)
        # Generate rules for GeneratedLists
        self.generate_generator_list_rules(target, outfile)

        # Generate rules for building the remaining source files in this target
        outname = self.get_target_filename(target)
        obj_list = []
        use_pch = self.environment.coredata.base_options.get('b_pch', False)
        is_unity = self.is_unity(target)
        if use_pch and target.has_pch():
            pch_objects = self.generate_pch(target, outfile)
        else:
            pch_objects = []
        header_deps = []
        unity_src = []
        unity_deps = [] # Generated sources that must be built before compiling a Unity target.
        header_deps += self.get_generated_headers(target)

        if is_unity:
            # Warn about incompatible sources if a unity build is enabled
            langs = set(target.compilers.keys())
            langs_cant = langs.intersection(self.langs_cant_unity)
            if langs_cant:
                langs_are = langs = ', '.join(langs_cant).upper()
                langs_are += ' are' if len(langs_cant) > 1 else ' is'
                msg = '{} not supported in Unity builds yet, so {} ' \
                      'sources in the {!r} target will be compiled normally' \
                      ''.format(langs_are, langs, target.name)
                mlog.log(mlog.red('FIXME'), msg)

        # Get a list of all generated headers that will be needed while building
        # this target's sources (generated sources and pre-existing sources).
        # This will be set as dependencies of all the target's sources. At the
        # same time, also deal with generated sources that need to be compiled.
        generated_source_files = []
        for rel_src, gensrc in generated_sources.items():
            dirpart, fnamepart = os.path.split(rel_src)
            raw_src = File(True, dirpart, fnamepart)
            if self.environment.is_source(rel_src) and not self.environment.is_header(rel_src):
                if is_unity and self.get_target_source_can_unity(target, rel_src):
                    unity_deps.append(raw_src)
                    abs_src = os.path.join(self.environment.get_build_dir(), rel_src)
                    unity_src.append(abs_src)
                else:
                    generated_source_files.append(raw_src)
            elif self.environment.is_object(rel_src):
                obj_list.append(rel_src)
            elif self.environment.is_library(rel_src):
                pass
            else:
                # Assume anything not specifically a source file is a header. This is because
                # people generate files with weird suffixes (.inc, .fh) that they then include
                # in their source files.
                header_deps.append(raw_src)
        # These are the generated source files that need to be built for use by
        # this target. We create the Ninja build file elements for this here
        # because we need `header_deps` to be fully generated in the above loop.
        for src in generated_source_files:
            if self.environment.is_llvm_ir(src):
                o = self.generate_llvm_ir_compile(target, outfile, src)
            else:
                o = self.generate_single_compile(target, outfile, src, True,
                                                 header_deps=header_deps)
            obj_list.append(o)

        # Generate compilation targets for C sources generated from Vala
        # sources. This can be extended to other $LANG->C compilers later if
        # necessary. This needs to be separate for at least Vala
        vala_generated_source_files = []
        for src in vala_generated_sources:
            dirpart, fnamepart = os.path.split(src)
            raw_src = File(True, dirpart, fnamepart)
            if is_unity:
                unity_src.append(os.path.join(self.environment.get_build_dir(), src))
                header_deps.append(raw_src)
            else:
                # Generated targets are ordered deps because the must exist
                # before the sources compiling them are used. After the first
                # compile we get precise dependency info from dep files.
                # This should work in all cases. If it does not, then just
                # move them from orderdeps to proper deps.
                if self.environment.is_header(src):
                    header_deps.append(raw_src)
                else:
                    # We gather all these and generate compile rules below
                    # after `header_deps` (above) is fully generated
                    vala_generated_source_files.append(raw_src)
        for src in vala_generated_source_files:
            # Passing 'vala' here signifies that we want the compile
            # arguments to be specialized for C code generated by
            # valac. For instance, no warnings should be emitted.
            obj_list.append(self.generate_single_compile(target, outfile, src, 'vala', [], header_deps))

        # Generate compile targets for all the pre-existing sources for this target
        for f, src in target_sources.items():
            if not self.environment.is_header(src):
                if self.environment.is_llvm_ir(src):
                    obj_list.append(self.generate_llvm_ir_compile(target, outfile, src))
                elif is_unity and self.get_target_source_can_unity(target, src):
                    abs_src = os.path.join(self.environment.get_build_dir(),
                                           src.rel_to_builddir(self.build_to_src))
                    unity_src.append(abs_src)
                else:
                    obj_list.append(self.generate_single_compile(target, outfile, src, False, [], header_deps))
        obj_list += self.flatten_object_list(target)
        if is_unity:
            for src in self.generate_unity_files(target, unity_src):
                obj_list.append(self.generate_single_compile(target, outfile, src, True, unity_deps + header_deps))
        linker, stdlib_args = self.determine_linker_and_stdlib_args(target)
        elem = self.generate_link(target, outfile, outname, obj_list, linker, pch_objects, stdlib_args=stdlib_args)
        self.generate_shlib_aliases(target, self.get_target_dir(target))
        elem.write(outfile)

    def process_target_dependencies(self, target, outfile):
        for t in target.get_dependencies():
            if t.get_id() not in self.processed_targets:
                self.generate_target(t, outfile)

    def custom_target_generator_inputs(self, target, outfile):
        for s in target.sources:
            if hasattr(s, 'held_object'):
                s = s.held_object
            if isinstance(s, build.GeneratedList):
                self.generate_genlist_for_target(s, target, outfile)

    def unwrap_dep_list(self, target):
        deps = []
        for i in target.get_dependencies():
            # FIXME, should not grab element at zero but rather expand all.
            if isinstance(i, list):
                i = i[0]
            # Add a dependency on all the outputs of this target
            for output in i.get_outputs():
                deps.append(os.path.join(self.get_target_dir(i), output))
        return deps

    def generate_custom_target(self, target, outfile):
        self.custom_target_generator_inputs(target, outfile)
        (srcs, ofilenames, cmd) = self.eval_custom_target_command(target)
        deps = self.unwrap_dep_list(target)
        deps += self.get_custom_target_depend_files(target)
        desc = 'Generating {0} with a {1} command.'
        if target.build_always_stale:
            deps.append('PHONY')
        if target.depfile is None:
            rulename = 'CUSTOM_COMMAND'
        else:
            rulename = 'CUSTOM_COMMAND_DEP'
        elem = NinjaBuildElement(self.all_outputs, ofilenames, rulename, srcs)
        elem.add_dep(deps)
        for d in target.extra_depends:
            # Add a dependency on all the outputs of this target
            for output in d.get_outputs():
                elem.add_dep(os.path.join(self.get_target_dir(d), output))
        serialize = False
        extra_paths = []
        # If the target requires capturing stdout, then use the serialized
        # executable wrapper to capture that output and save it to a file.
        if target.capture:
            serialize = True
        # If the command line requires a newline, also use the wrapper, as
        # ninja does not support them in its build rule syntax.
        if any('\n' in c for c in cmd):
            serialize = True
        # Windows doesn't have -rpath, so for EXEs that need DLLs built within
        # the project, we need to set PATH so the DLLs are found. We use
        # a serialized executable wrapper for that and check if the
        # CustomTarget command needs extra paths first.
        is_cross = self.environment.is_cross_build() and \
            self.environment.cross_info.need_cross_compiler() and \
            self.environment.cross_info.need_exe_wrapper()
        if mesonlib.for_windows(is_cross, self.environment) or \
           mesonlib.for_cygwin(is_cross, self.environment):
            extra_bdeps = target.get_transitive_build_target_deps()
            extra_paths = self.determine_windows_extra_paths(target.command[0],
                                                             extra_bdeps, is_cross)
            if extra_paths:
                serialize = True
        if serialize:
            exe_data = self.serialize_executable(target.name, target.command[0], cmd[1:],
                                                 # All targets are built from the build dir
                                                 self.environment.get_build_dir(),
                                                 extra_paths=extra_paths,
                                                 capture=ofilenames[0] if target.capture else None)
            cmd = self.environment.get_build_command() + ['--internal', 'exe', exe_data]
            cmd_type = 'meson_exe.py custom'
        else:
            cmd_type = 'custom'
        if target.depfile is not None:
            depfile = target.get_dep_outname(elem.infilenames)
            rel_dfile = os.path.join(self.get_target_dir(target), depfile)
            abs_pdir = os.path.join(self.environment.get_build_dir(), self.get_target_dir(target))
            os.makedirs(abs_pdir, exist_ok=True)
            elem.add_item('DEPFILE', rel_dfile)
        if target.console:
            elem.add_item('pool', 'console')
        cmd = self.replace_paths(target, cmd)
        elem.add_item('COMMAND', cmd)
        elem.add_item('description', desc.format(target.name, cmd_type))
        elem.write(outfile)
        self.processed_targets[target.get_id()] = True

    def generate_run_target(self, target, outfile):
        cmd = self.environment.get_build_command() + ['--internal', 'commandrunner']
        deps = self.unwrap_dep_list(target)
        arg_strings = []
        for i in target.args:
            if isinstance(i, str):
                arg_strings.append(i)
            elif isinstance(i, (build.BuildTarget, build.CustomTarget)):
                relfname = self.get_target_filename(i)
                arg_strings.append(os.path.join(self.environment.get_build_dir(), relfname))
                deps.append(relfname)
            elif isinstance(i, mesonlib.File):
                relfname = i.rel_to_builddir(self.build_to_src)
                arg_strings.append(os.path.join(self.environment.get_build_dir(), relfname))
            else:
                raise AssertionError('Unreachable code in generate_run_target: ' + str(i))
        if target.subproject != '':
            subproject_prefix = '{}@@'.format(target.subproject)
        else:
            subproject_prefix = ''
        target_name = 'meson-{}{}'.format(subproject_prefix, target.name)
        elem = NinjaBuildElement(self.all_outputs, target_name, 'CUSTOM_COMMAND', [])
        cmd += [self.environment.get_source_dir(),
                self.environment.get_build_dir(),
                target.subdir] + self.environment.get_build_command()
        texe = target.command
        try:
            texe = texe.held_object
        except AttributeError:
            pass
        if isinstance(texe, build.Executable):
            abs_exe = os.path.join(self.environment.get_build_dir(), self.get_target_filename(texe))
            deps.append(self.get_target_filename(texe))
            if self.environment.is_cross_build():
                exe_wrap = self.environment.get_exe_wrapper()
                if exe_wrap:
                    if not exe_wrap.found():
                        msg = 'The exe_wrapper {!r} defined in the cross file is ' \
                              'needed by run target {!r}, but was not found. ' \
                              'Please check the command and/or add it to PATH.'
                        raise MesonException(msg.format(exe_wrap.name, target.name))
                    cmd += exe_wrap.get_command()
            cmd.append(abs_exe)
        elif isinstance(texe, dependencies.ExternalProgram):
            cmd += texe.get_command()
        elif isinstance(texe, build.CustomTarget):
            deps.append(self.get_target_filename(texe))
            cmd += [os.path.join(self.environment.get_build_dir(), self.get_target_filename(texe))]
        elif isinstance(texe, mesonlib.File):
            cmd.append(texe.absolute_path(self.environment.get_source_dir(), self.environment.get_build_dir()))
        else:
            cmd.append(target.command)
        cmd += arg_strings

        elem.add_dep(deps)
        cmd = self.replace_paths(target, cmd)
        elem.add_item('COMMAND', cmd)
        elem.add_item('description', 'Running external command %s.' % target.name)
        elem.add_item('pool', 'console')
        elem.write(outfile)
        # Alias that runs the target defined above with the name the user specified
        self.create_target_alias(target_name, outfile)
        self.processed_targets[target.get_id()] = True

    def generate_coverage_command(self, elem, outputs):
        elem.add_item('COMMAND', self.environment.get_build_command() +
                      ['--internal', 'coverage'] +
                      outputs +
                      [self.environment.get_source_dir(),
                       os.path.join(self.environment.get_source_dir(),
                                    self.build.get_subproject_dir()),
                       self.environment.get_build_dir(),
                       self.environment.get_log_dir()])

    def generate_coverage_rules(self, outfile):
        e = NinjaBuildElement(self.all_outputs, 'meson-coverage', 'CUSTOM_COMMAND', 'PHONY')
        self.generate_coverage_command(e, [])
        e.add_item('description', 'Generates coverage reports.')
        e.write(outfile)
        # Alias that runs the target defined above
        self.create_target_alias('meson-coverage', outfile)
        self.generate_coverage_legacy_rules(outfile)

    def generate_coverage_legacy_rules(self, outfile):
        e = NinjaBuildElement(self.all_outputs, 'meson-coverage-xml', 'CUSTOM_COMMAND', 'PHONY')
        self.generate_coverage_command(e, ['--xml'])
        e.add_item('description', 'Generates XML coverage report.')
        e.write(outfile)
        # Alias that runs the target defined above
        self.create_target_alias('meson-coverage-xml', outfile)

        e = NinjaBuildElement(self.all_outputs, 'meson-coverage-text', 'CUSTOM_COMMAND', 'PHONY')
        self.generate_coverage_command(e, ['--text'])
        e.add_item('description', 'Generates text coverage report.')
        e.write(outfile)
        # Alias that runs the target defined above
        self.create_target_alias('meson-coverage-text', outfile)

        e = NinjaBuildElement(self.all_outputs, 'meson-coverage-html', 'CUSTOM_COMMAND', 'PHONY')
        self.generate_coverage_command(e, ['--html'])
        e.add_item('description', 'Generates HTML coverage report.')
        e.write(outfile)
        # Alias that runs the target defined above
        self.create_target_alias('meson-coverage-html', outfile)

    def generate_install(self, outfile):
        self.create_install_data_files()
        elem = NinjaBuildElement(self.all_outputs, 'meson-install', 'CUSTOM_COMMAND', 'PHONY')
        elem.add_dep('all')
        elem.add_item('DESC', 'Installing files.')
        elem.add_item('COMMAND', self.environment.get_build_command() + ['install', '--no-rebuild'])
        elem.add_item('pool', 'console')
        elem.write(outfile)
        # Alias that runs the target defined above
        self.create_target_alias('meson-install', outfile)

    def generate_tests(self, outfile):
        self.serialize_tests()
        cmd = self.environment.get_build_command(True) + ['test', '--no-rebuild']
        if not self.environment.coredata.get_builtin_option('stdsplit'):
            cmd += ['--no-stdsplit']
        if self.environment.coredata.get_builtin_option('errorlogs'):
            cmd += ['--print-errorlogs']
        elem = NinjaBuildElement(self.all_outputs, 'meson-test', 'CUSTOM_COMMAND', ['all', 'PHONY'])
        elem.add_item('COMMAND', cmd)
        elem.add_item('DESC', 'Running all tests.')
        elem.add_item('pool', 'console')
        elem.write(outfile)
        # Alias that runs the above-defined meson-test target
        self.create_target_alias('meson-test', outfile)

        # And then benchmarks.
        cmd = self.environment.get_build_command(True) + [
            'test', '--benchmark', '--logbase',
            'benchmarklog', '--num-processes=1', '--no-rebuild']
        elem = NinjaBuildElement(self.all_outputs, 'meson-benchmark', 'CUSTOM_COMMAND', ['all', 'PHONY'])
        elem.add_item('COMMAND', cmd)
        elem.add_item('DESC', 'Running benchmark suite.')
        elem.add_item('pool', 'console')
        elem.write(outfile)
        # Alias that runs the above-defined meson-benchmark target
        self.create_target_alias('meson-benchmark', outfile)

    def generate_rules(self, outfile):
        outfile.write('# Rules for compiling.\n\n')
        self.generate_compile_rules(outfile)
        outfile.write('# Rules for linking.\n\n')
        num_pools = self.environment.coredata.backend_options['backend_max_links'].value
        if num_pools > 0:
            outfile.write('''pool link_pool
  depth = %d

''' % num_pools)
        if self.environment.is_cross_build():
            self.generate_static_link_rules(True, outfile)
        self.generate_static_link_rules(False, outfile)
        self.generate_dynamic_link_rules(outfile)
        outfile.write('# Other rules\n\n')
        outfile.write('rule CUSTOM_COMMAND\n')
        outfile.write(' command = $COMMAND\n')
        outfile.write(' description = $DESC\n')
        outfile.write(' restat = 1\n\n')
        # Ninja errors out if you have deps = gcc but no depfile, so we must
        # have two rules for custom commands.
        outfile.write('rule CUSTOM_COMMAND_DEP\n')
        outfile.write(' command = $COMMAND\n')
        outfile.write(' description = $DESC\n')
        outfile.write(' deps = gcc\n')
        outfile.write(' depfile = $DEPFILE\n')
        outfile.write(' restat = 1\n\n')
        outfile.write('rule REGENERATE_BUILD\n')
        c = [ninja_quote(quote_func(x)) for x in self.environment.get_build_command()] + \
            ['--internal',
             'regenerate',
             ninja_quote(quote_func(self.environment.get_source_dir())),
             ninja_quote(quote_func(self.environment.get_build_dir()))]
        outfile.write(" command = " + ' '.join(c) + ' --backend ninja\n')
        outfile.write(' description = Regenerating build files.\n')
        outfile.write(' generator = 1\n\n')
        outfile.write('\n')

    def generate_phony(self, outfile):
        outfile.write('# Phony build target, always out of date\n')
        outfile.write('build PHONY: phony\n')
        outfile.write('\n')

    def generate_jar_target(self, target, outfile):
        fname = target.get_filename()
        outname_rel = os.path.join(self.get_target_dir(target), fname)
        src_list = target.get_sources()
        class_list = []
        compiler = target.compilers['java']
        c = 'c'
        m = 'm'
        e = ''
        f = 'f'
        main_class = target.get_main_class()
        if main_class != '':
            e = 'e'
        for src in src_list:
            plain_class_path = self.generate_single_java_compile(src, target, compiler, outfile)
            class_list.append(plain_class_path)
        class_dep_list = [os.path.join(self.get_target_private_dir(target), i) for i in class_list]
        manifest_path = os.path.join(self.get_target_private_dir(target), 'META-INF', 'MANIFEST.MF')
        manifest_fullpath = os.path.join(self.environment.get_build_dir(), manifest_path)
        os.makedirs(os.path.dirname(manifest_fullpath), exist_ok=True)
        with open(manifest_fullpath, 'w') as manifest:
            if any(target.link_targets):
                manifest.write('Class-Path: ')
                cp_paths = [os.path.join(self.get_target_dir(l), l.get_filename()) for l in target.link_targets]
                manifest.write(' '.join(cp_paths))
            manifest.write('\n')
        jar_rule = 'java_LINKER'
        commands = [c + m + e + f]
        commands.append(manifest_path)
        if e != '':
            commands.append(main_class)
        commands.append(self.get_target_filename(target))
        # Java compilation can produce an arbitrary number of output
        # class files for a single source file. Thus tell jar to just
        # grab everything in the final package.
        commands += ['-C', self.get_target_private_dir(target), '.']
        elem = NinjaBuildElement(self.all_outputs, outname_rel, jar_rule, [])
        elem.add_dep(class_dep_list)
        elem.add_item('ARGS', commands)
        elem.write(outfile)

    def generate_cs_resource_tasks(self, target, outfile):
        args = []
        deps = []
        for r in target.resources:
            rel_sourcefile = os.path.join(self.build_to_src, target.subdir, r)
            if r.endswith('.resources'):
                a = '-resource:' + rel_sourcefile
            elif r.endswith('.txt') or r.endswith('.resx'):
                ofilebase = os.path.splitext(os.path.basename(r))[0] + '.resources'
                ofilename = os.path.join(self.get_target_private_dir(target), ofilebase)
                elem = NinjaBuildElement(self.all_outputs, ofilename, "CUSTOM_COMMAND", rel_sourcefile)
                elem.add_item('COMMAND', ['resgen', rel_sourcefile, ofilename])
                elem.add_item('DESC', 'Compiling resource %s.' % rel_sourcefile)
                elem.write(outfile)
                deps.append(ofilename)
                a = '-resource:' + ofilename
            else:
                raise InvalidArguments('Unknown resource file %s.' % r)
            args.append(a)
        return args, deps

    def generate_cs_target(self, target, outfile):
        buildtype = self.get_option_for_target('buildtype', target)
        fname = target.get_filename()
        outname_rel = os.path.join(self.get_target_dir(target), fname)
        src_list = target.get_sources()
        compiler = target.compilers['cs']
        rel_srcs = [os.path.normpath(s.rel_to_builddir(self.build_to_src)) for s in src_list]
        deps = []
        commands = CompilerArgs(compiler, target.extra_args.get('cs', []))
        commands += compiler.get_buildtype_args(buildtype)
        if isinstance(target, build.Executable):
            commands.append('-target:exe')
        elif isinstance(target, build.SharedLibrary):
            commands.append('-target:library')
        else:
            raise MesonException('Unknown C# target type.')
        (resource_args, resource_deps) = self.generate_cs_resource_tasks(target, outfile)
        commands += resource_args
        deps += resource_deps
        commands += compiler.get_output_args(outname_rel)
        for l in target.link_targets:
            lname = os.path.join(self.get_target_dir(l), l.get_filename())
            commands += compiler.get_link_args(lname)
            deps.append(lname)
        if '-g' in commands:
            outputs = [outname_rel, outname_rel + '.mdb']
        else:
            outputs = [outname_rel]
        generated_sources = self.get_target_generated_sources(target)
        for rel_src in generated_sources.keys():
            dirpart, fnamepart = os.path.split(rel_src)
            if rel_src.lower().endswith('.cs'):
                rel_srcs.append(os.path.normpath(rel_src))
            deps.append(os.path.normpath(rel_src))

        for dep in target.get_external_deps():
            commands.extend_direct(dep.get_link_args())
        commands += self.build.get_project_args(compiler, target.subproject)
        commands += self.build.get_global_args(compiler)

        elem = NinjaBuildElement(self.all_outputs, outputs, 'cs_COMPILER', rel_srcs)
        elem.add_dep(deps)
        elem.add_item('ARGS', commands)
        elem.write(outfile)

        self.generate_generator_list_rules(target, outfile)

    def generate_single_java_compile(self, src, target, compiler, outfile):
        deps = [os.path.join(self.get_target_dir(l), l.get_filename()) for l in target.link_targets]
        args = []
        args += compiler.get_buildtype_args(self.get_option_for_target('buildtype', target))
        args += self.build.get_global_args(compiler)
        args += self.build.get_project_args(compiler, target.subproject)
        args += target.get_java_args()
        args += compiler.get_output_args(self.get_target_private_dir(target))
        args += target.get_classpath_args()
        curdir = target.get_subdir()
        sourcepath = os.path.join(self.build_to_src, curdir) + os.pathsep
        sourcepath += os.path.normpath(curdir) + os.pathsep
        for i in target.include_dirs:
            for idir in i.get_incdirs():
                sourcepath += os.path.join(self.build_to_src, i.curdir, idir) + os.pathsep
        args += ['-sourcepath', sourcepath]
        rel_src = src.rel_to_builddir(self.build_to_src)
        plain_class_path = src.fname[:-4] + 'class'
        rel_obj = os.path.join(self.get_target_private_dir(target), plain_class_path)
        element = NinjaBuildElement(self.all_outputs, rel_obj, compiler.get_language() + '_COMPILER', rel_src)
        element.add_dep(deps)
        element.add_item('ARGS', args)
        element.write(outfile)
        return plain_class_path

    def generate_java_link(self, outfile):
        rule = 'rule java_LINKER\n'
        command = ' command = jar $ARGS\n'
        description = ' description = Creating JAR $out.\n'
        outfile.write(rule)
        outfile.write(command)
        outfile.write(description)
        outfile.write('\n')

    def determine_dep_vapis(self, target):
        """
        Peek into the sources of BuildTargets we're linking with, and if any of
        them was built with Vala, assume that it also generated a .vapi file of
        the same name as the BuildTarget and return the path to it relative to
        the build directory.
        """
        result = OrderedSet()
        for dep in itertools.chain(target.link_targets, target.link_whole_targets):
            if not dep.is_linkable_target():
                continue
            for i in dep.sources:
                if hasattr(i, 'fname'):
                    i = i.fname
                if i.endswith('vala'):
                    vapiname = dep.vala_vapi
                    fullname = os.path.join(self.get_target_dir(dep), vapiname)
                    result.add(fullname)
                    break
        return list(result)

    def split_vala_sources(self, t):
        """
        Splits the target's sources into .vala, .gs, .vapi, and other sources.
        Handles both pre-existing and generated sources.

        Returns a tuple (vala, vapi, others) each of which is a dictionary with
        the keys being the path to the file (relative to the build directory)
        and the value being the object that generated or represents the file.
        """
        vala = OrderedDict()
        vapi = OrderedDict()
        others = OrderedDict()
        othersgen = OrderedDict()
        # Split pre-existing sources
        for s in t.get_sources():
            # BuildTarget sources are always mesonlib.File files which are
            # either in the source root, or generated with configure_file and
            # in the build root
            if not isinstance(s, File):
                msg = 'All sources in target {!r} must be of type ' \
                      'mesonlib.File, not {!r}'.format(t, s)
                raise InvalidArguments(msg)
            f = s.rel_to_builddir(self.build_to_src)
            if s.endswith(('.vala', '.gs')):
                srctype = vala
            elif s.endswith('.vapi'):
                srctype = vapi
            else:
                srctype = others
            srctype[f] = s
        # Split generated sources
        for gensrc in t.get_generated_sources():
            for s in gensrc.get_outputs():
                f = self.get_target_generated_dir(t, gensrc, s)
                if s.endswith(('.vala', '.gs')):
                    srctype = vala
                elif s.endswith('.vapi'):
                    srctype = vapi
                # Generated non-Vala (C/C++) sources. Won't be used for
                # generating the Vala compile rule below.
                else:
                    srctype = othersgen
                # Duplicate outputs are disastrous
                if f in srctype and srctype[f] is not gensrc:
                    msg = 'Duplicate output {0!r} from {1!r} {2!r}; ' \
                          'conflicts with {0!r} from {4!r} {3!r}' \
                          ''.format(f, type(gensrc).__name__, gensrc.name,
                                    srctype[f].name, type(srctype[f]).__name__)
                    raise InvalidArguments(msg)
                # Store 'somefile.vala': GeneratedList (or CustomTarget)
                srctype[f] = gensrc
        return vala, vapi, (others, othersgen)

    def generate_vala_compile(self, target, outfile):
        """Vala is compiled into C. Set up all necessary build steps here."""
        (vala_src, vapi_src, other_src) = self.split_vala_sources(target)
        extra_dep_files = []
        if not vala_src:
            msg = 'Vala library {!r} has no Vala or Genie source files.'
            raise InvalidArguments(msg.format(target.name))

        valac = target.compilers['vala']
        c_out_dir = self.get_target_private_dir(target)
        # C files generated by valac
        vala_c_src = []
        # Files generated by valac
        valac_outputs = []
        # All sources that are passed to valac on the commandline
        all_files = list(vapi_src.keys())
        # Passed as --basedir
        srcbasedir = os.path.join(self.build_to_src, target.get_subdir())
        for (vala_file, gensrc) in vala_src.items():
            all_files.append(vala_file)
            # Figure out where the Vala compiler will write the compiled C file
            #
            # If the Vala file is in a subdir of the build dir (in our case
            # because it was generated/built by something else), and is also
            # a subdir of --basedir (because the builddir is in the source
            # tree, and the target subdir is the source root), the subdir
            # components from the source root till the private builddir will be
            # duplicated inside the private builddir. Otherwise, just the
            # basename will be used.
            #
            # If the Vala file is outside the build directory, the paths from
            # the --basedir till the subdir will be duplicated inside the
            # private builddir.
            if isinstance(gensrc, (build.CustomTarget, build.GeneratedList)) or gensrc.is_built:
                vala_c_file = os.path.splitext(os.path.basename(vala_file))[0] + '.c'
                # Check if the vala file is in a subdir of --basedir
                abs_srcbasedir = os.path.join(self.environment.get_source_dir(), target.get_subdir())
                abs_vala_file = os.path.join(self.environment.get_build_dir(), vala_file)
                if PurePath(os.path.commonpath((abs_srcbasedir, abs_vala_file))) == PurePath(abs_srcbasedir):
                    vala_c_subdir = PurePath(abs_vala_file).parent.relative_to(abs_srcbasedir)
                    vala_c_file = os.path.join(str(vala_c_subdir), vala_c_file)
            else:
                path_to_target = os.path.join(self.build_to_src, target.get_subdir())
                if vala_file.startswith(path_to_target):
                    vala_c_file = os.path.splitext(os.path.relpath(vala_file, path_to_target))[0] + '.c'
                else:
                    vala_c_file = os.path.splitext(os.path.basename(vala_file))[0] + '.c'
            # All this will be placed inside the c_out_dir
            vala_c_file = os.path.join(c_out_dir, vala_c_file)
            vala_c_src.append(vala_c_file)
            valac_outputs.append(vala_c_file)

        args = self.generate_basic_compiler_args(target, valac)
        args += valac.get_colorout_args(self.environment.coredata.base_options.get('b_colorout').value)
        # Tell Valac to output everything in our private directory. Sadly this
        # means it will also preserve the directory components of Vala sources
        # found inside the build tree (generated sources).
        args += ['--directory', c_out_dir]
        args += ['--basedir', srcbasedir]
        if target.is_linkable_target():
            # Library name
            args += ['--library', target.name]
            # Outputted header
            hname = os.path.join(self.get_target_dir(target), target.vala_header)
            args += ['--header', hname]
            if self.is_unity(target):
                # Without this the declarations will get duplicated in the .c
                # files and cause a build failure when all of them are
                # #include-d in one .c file.
                # https://github.com/mesonbuild/meson/issues/1969
                args += ['--use-header']
            valac_outputs.append(hname)
            # Outputted vapi file
            vapiname = os.path.join(self.get_target_dir(target), target.vala_vapi)
            # Force valac to write the vapi and gir files in the target build dir.
            # Without this, it will write it inside c_out_dir
            args += ['--vapi', os.path.join('..', target.vala_vapi)]
            valac_outputs.append(vapiname)
            target.outputs += [target.vala_header, target.vala_vapi]
            # Install header and vapi to default locations if user requests this
            if len(target.install_dir) > 1 and target.install_dir[1] is True:
                target.install_dir[1] = self.environment.get_includedir()
            if len(target.install_dir) > 2 and target.install_dir[2] is True:
                target.install_dir[2] = os.path.join(self.environment.get_datadir(), 'vala', 'vapi')
            # Generate GIR if requested
            if isinstance(target.vala_gir, str):
                girname = os.path.join(self.get_target_dir(target), target.vala_gir)
                args += ['--gir', os.path.join('..', target.vala_gir)]
                valac_outputs.append(girname)
                target.outputs.append(target.vala_gir)
                # Install GIR to default location if requested by user
                if len(target.install_dir) > 3 and target.install_dir[3] is True:
                    target.install_dir[3] = os.path.join(self.environment.get_datadir(), 'gir-1.0')
        # Detect gresources and add --gresources arguments for each
        for (gres, gensrc) in other_src[1].items():
            if isinstance(gensrc, modules.GResourceTarget):
                gres_xml, = self.get_custom_target_sources(gensrc)
                args += ['--gresources=' + gres_xml]
        extra_args = []

        for a in target.extra_args.get('vala', []):
            if isinstance(a, File):
                relname = a.rel_to_builddir(self.build_to_src)
                extra_dep_files.append(relname)
                extra_args.append(relname)
            else:
                extra_args.append(a)
        dependency_vapis = self.determine_dep_vapis(target)
        extra_dep_files += dependency_vapis
        args += extra_args
        element = NinjaBuildElement(self.all_outputs, valac_outputs,
                                    valac.get_language() + '_COMPILER',
                                    all_files + dependency_vapis)
        element.add_item('ARGS', args)
        element.add_dep(extra_dep_files)
        element.write(outfile)
        return other_src[0], other_src[1], vala_c_src

    def generate_rust_target(self, target, outfile):
        rustc = target.compilers['rust']
        # Rust compiler takes only the main file as input and
        # figures out what other files are needed via import
        # statements and magic.
        main_rust_file = None
        for i in target.get_sources():
            if not rustc.can_compile(i):
                raise InvalidArguments('Rust target %s contains a non-rust source file.' % target.get_basename())
            if main_rust_file is None:
                main_rust_file = i.rel_to_builddir(self.build_to_src)
        if main_rust_file is None:
            raise RuntimeError('A Rust target has no Rust sources. This is weird. Also a bug. Please report')
        target_name = os.path.join(target.subdir, target.get_filename())
        args = ['--crate-type']
        if isinstance(target, build.Executable):
            cratetype = 'bin'
        elif hasattr(target, 'rust_crate_type'):
            cratetype = target.rust_crate_type
        elif isinstance(target, build.SharedLibrary):
            cratetype = 'dylib'
        elif isinstance(target, build.StaticLibrary):
            cratetype = 'rlib'
        else:
            raise InvalidArguments('Unknown target type for rustc.')
        args.append(cratetype)
        args += ['--crate-name', target.name]
        args += rustc.get_buildtype_args(self.get_option_for_target('buildtype', target))
        depfile = os.path.join(target.subdir, target.name + '.d')
        args += ['--emit', 'dep-info={}'.format(depfile), '--emit', 'link']
        args += target.get_extra_args('rust')
        args += ['-o', os.path.join(target.subdir, target.get_filename())]
        orderdeps = [os.path.join(t.subdir, t.get_filename()) for t in target.link_targets]
        linkdirs = OrderedDict()
        for d in target.link_targets:
            linkdirs[d.subdir] = True
            # specify `extern CRATE_NAME=OUTPUT_FILE` for each Rust
            # dependency, so that collisions with libraries in rustc's
            # sysroot don't cause ambiguity
            args += ['--extern', '{}={}'.format(d.name, os.path.join(d.subdir, d.filename))]
        for d in linkdirs.keys():
            if d == '':
                d = '.'
            args += ['-L', d]
        has_shared_deps = False
        for dep in target.get_dependencies():
            if isinstance(dep, build.SharedLibrary):
                has_shared_deps = True
        if isinstance(target, build.SharedLibrary) or has_shared_deps:
            # add prefer-dynamic if any of the Rust libraries we link
            # against are dynamic, otherwise we'll end up with
            # multiple implementations of crates
            args += ['-C', 'prefer-dynamic']

            # build the usual rpath arguments as well...

            # Set runtime-paths so we can run executables without needing to set
            # LD_LIBRARY_PATH, etc in the environment. Doesn't work on Windows.
            if has_path_sep(target.name):
                # Target names really should not have slashes in them, but
                # unfortunately we did not check for that and some downstream projects
                # now have them. Once slashes are forbidden, remove this bit.
                target_slashname_workaround_dir = os.path.join(os.path.dirname(target.name),
                                                               self.get_target_dir(target))
            else:
                target_slashname_workaround_dir = self.get_target_dir(target)
            rpath_args = rustc.build_rpath_args(self.environment.get_build_dir(),
                                                target_slashname_workaround_dir,
                                                self.determine_rpath_dirs(target),
                                                target.build_rpath,
                                                target.install_rpath)
            # ... but then add rustc's sysroot to account for rustup
            # installations
            for rpath_arg in rpath_args:
                args += ['-C', 'link-arg=' + rpath_arg + ':' + os.path.join(rustc.get_sysroot(), 'lib')]
        crstr = ''
        if target.is_cross:
            crstr = '_CROSS'
        compiler_name = 'rust%s_COMPILER' % crstr
        element = NinjaBuildElement(self.all_outputs, target_name, compiler_name, main_rust_file)
        if len(orderdeps) > 0:
            element.add_orderdep(orderdeps)
        element.add_item('ARGS', args)
        element.add_item('targetdep', depfile)
        element.add_item('cratetype', cratetype)
        element.write(outfile)
        if isinstance(target, build.SharedLibrary):
            self.generate_shsym(outfile, target)

    def swift_module_file_name(self, target):
        return os.path.join(self.get_target_private_dir(target),
                            self.target_swift_modulename(target) + '.swiftmodule')

    def target_swift_modulename(self, target):
        return target.name

    def is_swift_target(self, target):
        for s in target.sources:
            if s.endswith('swift'):
                return True
        return False

    def determine_swift_dep_modules(self, target):
        result = []
        for l in target.link_targets:
            if self.is_swift_target(l):
                result.append(self.swift_module_file_name(l))
        return result

    def determine_swift_dep_dirs(self, target):
        result = []
        for l in target.link_targets:
            result.append(self.get_target_private_dir_abs(l))
        return result

    def get_swift_link_deps(self, target):
        result = []
        for l in target.link_targets:
            result.append(self.get_target_filename(l))
        return result

    def split_swift_generated_sources(self, target):
        all_srcs = self.get_target_generated_sources(target)
        srcs = []
        others = []
        for i in all_srcs:
            if i.endswith('.swift'):
                srcs.append(i)
            else:
                others.append(i)
        return srcs, others

    def generate_swift_target(self, target, outfile):
        module_name = self.target_swift_modulename(target)
        swiftc = target.compilers['swift']
        abssrc = []
        abs_headers = []
        header_imports = []
        for i in target.get_sources():
            if swiftc.can_compile(i):
                relsrc = i.rel_to_builddir(self.build_to_src)
                abss = os.path.normpath(os.path.join(self.environment.get_build_dir(), relsrc))
                abssrc.append(abss)
            elif self.environment.is_header(i):
                relh = i.rel_to_builddir(self.build_to_src)
                absh = os.path.normpath(os.path.join(self.environment.get_build_dir(), relh))
                abs_headers.append(absh)
                header_imports += swiftc.get_header_import_args(absh)
            else:
                raise InvalidArguments('Swift target %s contains a non-swift source file.' % target.get_basename())
        os.makedirs(self.get_target_private_dir_abs(target), exist_ok=True)
        compile_args = swiftc.get_compile_only_args()
        compile_args += swiftc.get_module_args(module_name)
        compile_args += self.build.get_project_args(swiftc, target.subproject)
        compile_args += self.build.get_global_args(swiftc)
        for i in reversed(target.get_include_dirs()):
            basedir = i.get_curdir()
            for d in i.get_incdirs():
                if d not in ('', '.'):
                    expdir = os.path.join(basedir, d)
                else:
                    expdir = basedir
                srctreedir = os.path.normpath(os.path.join(self.environment.get_build_dir(), self.build_to_src, expdir))
                sargs = swiftc.get_include_args(srctreedir)
                compile_args += sargs
        link_args = swiftc.get_output_args(os.path.join(self.environment.get_build_dir(), self.get_target_filename(target)))
        link_args += self.build.get_project_link_args(swiftc, target.subproject)
        link_args += self.build.get_global_link_args(swiftc)
        rundir = self.get_target_private_dir(target)
        out_module_name = self.swift_module_file_name(target)
        in_module_files = self.determine_swift_dep_modules(target)
        abs_module_dirs = self.determine_swift_dep_dirs(target)
        module_includes = []
        for x in abs_module_dirs:
            module_includes += swiftc.get_include_args(x)
        link_deps = self.get_swift_link_deps(target)
        abs_link_deps = [os.path.join(self.environment.get_build_dir(), x) for x in link_deps]
        for d in target.link_targets:
            reldir = self.get_target_dir(d)
            if reldir == '':
                reldir = '.'
            link_args += ['-L', os.path.normpath(os.path.join(self.environment.get_build_dir(), reldir))]
        (rel_generated, _) = self.split_swift_generated_sources(target)
        abs_generated = [os.path.join(self.environment.get_build_dir(), x) for x in rel_generated]
        # We need absolute paths because swiftc needs to be invoked in a subdir
        # and this is the easiest way about it.
        objects = [] # Relative to swift invocation dir
        rel_objects = [] # Relative to build.ninja
        for i in abssrc + abs_generated:
            base = os.path.basename(i)
            oname = os.path.splitext(base)[0] + '.o'
            objects.append(oname)
            rel_objects.append(os.path.join(self.get_target_private_dir(target), oname))

        # Swiftc does not seem to be able to emit objects and module files in one go.
        elem = NinjaBuildElement(self.all_outputs, rel_objects,
                                 'swift_COMPILER',
                                 abssrc)
        elem.add_dep(in_module_files + rel_generated)
        elem.add_dep(abs_headers)
        elem.add_item('ARGS', compile_args + header_imports + abs_generated + module_includes)
        elem.add_item('RUNDIR', rundir)
        elem.write(outfile)
        elem = NinjaBuildElement(self.all_outputs, out_module_name,
                                 'swift_COMPILER',
                                 abssrc)
        elem.add_dep(in_module_files + rel_generated)
        elem.add_item('ARGS', compile_args + abs_generated + module_includes + swiftc.get_mod_gen_args())
        elem.add_item('RUNDIR', rundir)
        elem.write(outfile)
        if isinstance(target, build.StaticLibrary):
            elem = self.generate_link(target, outfile, self.get_target_filename(target),
                                      rel_objects, self.build.static_linker)
            elem.write(outfile)
        elif isinstance(target, build.Executable):
            elem = NinjaBuildElement(self.all_outputs, self.get_target_filename(target), 'swift_COMPILER', [])
            elem.add_dep(rel_objects)
            elem.add_dep(link_deps)
            elem.add_item('ARGS', link_args + swiftc.get_std_exe_link_args() + objects + abs_link_deps)
            elem.add_item('RUNDIR', rundir)
            elem.write(outfile)
        else:
            raise MesonException('Swift supports only executable and static library targets.')

    def generate_static_link_rules(self, is_cross, outfile):
        num_pools = self.environment.coredata.backend_options['backend_max_links'].value
        if 'java' in self.build.compilers:
            if not is_cross:
                self.generate_java_link(outfile)
        if is_cross:
            if self.environment.cross_info.need_cross_compiler():
                static_linker = self.build.static_cross_linker
            else:
                static_linker = self.build.static_linker
            crstr = '_CROSS'
        else:
            static_linker = self.build.static_linker
            crstr = ''
        if static_linker is None:
            return
        rule = 'rule STATIC%s_LINKER\n' % crstr
        if static_linker.can_linker_accept_rsp():
            command_template = ''' command = {executable} $LINK_ARGS {output_args} @$out.rsp
 rspfile = $out.rsp
 rspfile_content = $in
'''
        else:
            command_template = ' command = {executable} $LINK_ARGS {output_args} $in\n'
        cmdlist = []
        # FIXME: Must normalize file names with pathlib.Path before writing
        #        them out to fix this properly on Windows. See:
        # https://github.com/mesonbuild/meson/issues/1517
        # https://github.com/mesonbuild/meson/issues/1526
        if isinstance(static_linker, ArLinker) and not mesonlib.is_windows():
            # `ar` has no options to overwrite archives. It always appends,
            # which is never what we want. Delete an existing library first if
            # it exists. https://github.com/mesonbuild/meson/issues/1355
            cmdlist = [execute_wrapper, rmfile_prefix.format('$out')]
        cmdlist += static_linker.get_exelist()
        command = command_template.format(
            executable=' '.join(cmdlist),
            output_args=' '.join(static_linker.get_output_args('$out')))
        description = ' description = Linking static target $out.\n\n'
        outfile.write(rule)
        outfile.write(command)
        if num_pools > 0:
            outfile.write(' pool = link_pool\n')
        outfile.write(description)

    def generate_dynamic_link_rules(self, outfile):
        num_pools = self.environment.coredata.backend_options['backend_max_links'].value
        ctypes = [(self.build.compilers, False)]
        if self.environment.is_cross_build():
            if self.environment.cross_info.need_cross_compiler():
                ctypes.append((self.build.cross_compilers, True))
            else:
                # Native compiler masquerades as the cross compiler.
                ctypes.append((self.build.compilers, True))
        else:
            ctypes.append((self.build.cross_compilers, True))
        for (complist, is_cross) in ctypes:
            for langname, compiler in complist.items():
                if langname == 'java' \
                        or langname == 'vala' \
                        or langname == 'rust' \
                        or langname == 'cs':
                    continue
                crstr = ''
                cross_args = []
                if is_cross:
                    crstr = '_CROSS'
                    try:
                        cross_args = self.environment.cross_info.config['properties'][langname + '_link_args']
                    except KeyError:
                        pass
                rule = 'rule %s%s_LINKER\n' % (langname, crstr)
                if compiler.can_linker_accept_rsp():
                    command_template = ''' command = {executable} @$out.rsp
 rspfile = $out.rsp
 rspfile_content = $ARGS  {output_args} $in $LINK_ARGS {cross_args} $aliasing
'''
                else:
                    command_template = ' command = {executable} $ARGS {output_args} $in $LINK_ARGS {cross_args} $aliasing\n'
                command = command_template.format(
                    executable=' '.join(compiler.get_linker_exelist()),
                    cross_args=' '.join(cross_args),
                    output_args=' '.join(compiler.get_linker_output_args('$out'))
                )
                description = ' description = Linking target $out.\n'
                outfile.write(rule)
                outfile.write(command)
                if num_pools > 0:
                    outfile.write(' pool = link_pool\n')
                outfile.write(description)
                outfile.write('\n')
        outfile.write('\n')
        args = [ninja_quote(quote_func(x)) for x in self.environment.get_build_command()] + \
            ['--internal',
             'symbolextractor',
             '$in',
             '$out']
        symrule = 'rule SHSYM\n'
        symcmd = ' command = ' + ' '.join(args) + ' $CROSS\n'
        synstat = ' restat = 1\n'
        syndesc = ' description = Generating symbol file $out.\n'
        outfile.write(symrule)
        outfile.write(symcmd)
        outfile.write(synstat)
        outfile.write(syndesc)
        outfile.write('\n')

    def generate_java_compile_rule(self, compiler, outfile):
        rule = 'rule %s_COMPILER\n' % compiler.get_language()
        invoc = ' '.join([ninja_quote(i) for i in compiler.get_exelist()])
        command = ' command = %s $ARGS $in\n' % invoc
        description = ' description = Compiling Java object $in.\n'
        outfile.write(rule)
        outfile.write(command)
        outfile.write(description)
        outfile.write('\n')

    def generate_cs_compile_rule(self, compiler, outfile):
        rule = 'rule %s_COMPILER\n' % compiler.get_language()
        invoc = ' '.join([ninja_quote(i) for i in compiler.get_exelist()])

        if mesonlib.is_windows():
            command = ''' command = {executable}  @$out.rsp
 rspfile = $out.rsp
 rspfile_content =  $ARGS  $in
'''.format(executable=invoc)
        else:
            command = ' command = %s $ARGS $in\n' % invoc

        description = ' description = Compiling C Sharp target $out.\n'
        outfile.write(rule)
        outfile.write(command)
        outfile.write(description)
        outfile.write('\n')

    def generate_vala_compile_rules(self, compiler, outfile):
        rule = 'rule %s_COMPILER\n' % compiler.get_language()
        invoc = ' '.join([ninja_quote(i) for i in compiler.get_exelist()])
        command = ' command = %s $ARGS $in\n' % invoc
        description = ' description = Compiling Vala source $in.\n'
        restat = ' restat = 1\n' # ValaC does this always to take advantage of it.
        outfile.write(rule)
        outfile.write(command)
        outfile.write(description)
        outfile.write(restat)
        outfile.write('\n')

    def generate_rust_compile_rules(self, compiler, outfile, is_cross):
        crstr = ''
        if is_cross:
            crstr = '_CROSS'
        rule = 'rule %s%s_COMPILER\n' % (compiler.get_language(), crstr)
        invoc = ' '.join([ninja_quote(i) for i in compiler.get_exelist()])
        command = ' command = %s $ARGS $in\n' % invoc
        description = ' description = Compiling Rust source $in.\n'
        depfile = ' depfile = $targetdep\n'

        depstyle = ' deps = gcc\n'
        outfile.write(rule)
        outfile.write(command)
        outfile.write(description)
        outfile.write(depfile)
        outfile.write(depstyle)
        outfile.write('\n')

    def generate_swift_compile_rules(self, compiler, outfile):
        rule = 'rule %s_COMPILER\n' % compiler.get_language()
        full_exe = [ninja_quote(x) for x in self.environment.get_build_command()] + [
            '--internal',
            'dirchanger',
            '$RUNDIR',
        ]
        invoc = (' '.join(full_exe) + ' ' +
                 ' '.join(ninja_quote(i) for i in compiler.get_exelist()))
        command = ' command = %s $ARGS $in\n' % invoc
        description = ' description = Compiling Swift source $in.\n'
        outfile.write(rule)
        outfile.write(command)
        outfile.write(description)
        outfile.write('\n')

    def generate_fortran_dep_hack(self, outfile, crstr):
        if mesonlib.is_windows():
            cmd = 'cmd /C ""'
        else:
            cmd = 'true'
        template = '''# Workaround for these issues:
# https://groups.google.com/forum/#!topic/ninja-build/j-2RfBIOd_8
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47485
rule FORTRAN_DEP_HACK%s
 command = %s
 description = Dep hack
 restat = 1

'''
        outfile.write(template % (crstr, cmd))

    def generate_llvm_ir_compile_rule(self, compiler, is_cross, outfile):
        if getattr(self, 'created_llvm_ir_rule', False):
            return
        rule = 'rule llvm_ir{}_COMPILER\n'.format('_CROSS' if is_cross else '')
        if compiler.can_linker_accept_rsp():
            command_template = ' command = {executable} @$out.rsp\n' \
                               ' rspfile = $out.rsp\n' \
                               ' rspfile_content =  $ARGS {cross_args} {output_args} {compile_only_args} $in\n'
        else:
            command_template = ' command = {executable} $ARGS {cross_args} {output_args} {compile_only_args} $in\n'
        command = command_template.format(
            executable=' '.join([ninja_quote(i) for i in compiler.get_exelist()]),
            cross_args=' '.join(self.get_cross_info_lang_args(compiler.language, is_cross)),
            output_args=' '.join(compiler.get_output_args('$out')),
            compile_only_args=' '.join(compiler.get_compile_only_args())
        )
        description = ' description = Compiling LLVM IR object $in.\n'
        outfile.write(rule)
        outfile.write(command)
        outfile.write(description)
        outfile.write('\n')
        self.created_llvm_ir_rule = True

    def get_cross_info_lang_args(self, lang, is_cross):
        if is_cross:
            try:
                return self.environment.cross_info.config['properties'][lang + '_args']
            except KeyError:
                pass
        return []

    def generate_compile_rule_for(self, langname, compiler, is_cross, outfile):
        if langname == 'java':
            if not is_cross:
                self.generate_java_compile_rule(compiler, outfile)
            return
        if langname == 'cs':
            if not is_cross:
                self.generate_cs_compile_rule(compiler, outfile)
            return
        if langname == 'vala':
            if not is_cross:
                self.generate_vala_compile_rules(compiler, outfile)
            return
        if langname == 'rust':
            self.generate_rust_compile_rules(compiler, outfile, is_cross)
            return
        if langname == 'swift':
            if not is_cross:
                self.generate_swift_compile_rules(compiler, outfile)
            return
        if is_cross:
            crstr = '_CROSS'
        else:
            crstr = ''
        if langname == 'fortran':
            self.generate_fortran_dep_hack(outfile, crstr)


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