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The Meson Build System http://mesonbuild.com/
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meson/mesonbuild/msetup.py

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# Copyright 2016-2018 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.
from __future__ import annotations
import typing as T
import time
import sys
import datetime
import os.path
import platform
import cProfile as profile
import argparse
import tempfile
import shutil
import glob
from pathlib import Path
from . import environment, interpreter, mesonlib
from . import build
from . import mlog, coredata
from . import mintro
from .mesonlib import MesonException, MachineChoice
from .dependencies import PkgConfigDependency
git_ignore_file = '''# This file is autogenerated by Meson. If you change or delete it, it won't be recreated.
*
'''
hg_ignore_file = '''# This file is autogenerated by Meson. If you change or delete it, it won't be recreated.
syntax: glob
**/*
'''
def add_arguments(parser: argparse.ArgumentParser) -> None:
coredata.register_builtin_arguments(parser)
parser.add_argument('--native-file',
default=[],
action='append',
help='File containing overrides for native compilation environment.')
parser.add_argument('--cross-file',
default=[],
action='append',
help='File describing cross compilation environment.')
parser.add_argument('-v', '--version', action='version',
version=coredata.version)
parser.add_argument('--profile-self', action='store_true', dest='profile',
help=argparse.SUPPRESS)
parser.add_argument('--fatal-meson-warnings', action='store_true', dest='fatal_warnings',
help='Make all Meson warnings fatal')
parser.add_argument('--reconfigure', action='store_true',
help='Set options and reconfigure the project. Useful when new ' +
'options have been added to the project and the default value ' +
'is not working.')
parser.add_argument('--wipe', action='store_true',
help='Wipe build directory and reconfigure using previous command line options. ' +
'Useful when build directory got corrupted, or when rebuilding with a ' +
'newer version of meson.')
parser.add_argument('builddir', nargs='?', default=None)
parser.add_argument('sourcedir', nargs='?', default=None)
class MesonApp:
def __init__(self, options: argparse.Namespace) -> None:
(self.source_dir, self.build_dir) = self.validate_dirs(options.builddir,
options.sourcedir,
options.reconfigure,
options.wipe)
if options.wipe:
# Make a copy of the cmd line file to make sure we can always
# restore that file if anything bad happens. For example if
# configuration fails we need to be able to wipe again.
restore = []
with tempfile.TemporaryDirectory() as d:
for filename in [coredata.get_cmd_line_file(self.build_dir)] + glob.glob(os.path.join(self.build_dir, environment.Environment.private_dir, '*.ini')):
try:
restore.append((shutil.copy(filename, d), filename))
except FileNotFoundError:
# validate_dirs() already verified that build_dir has
# a partial build or is empty.
pass
coredata.read_cmd_line_file(self.build_dir, options)
try:
# Don't delete the whole tree, just all of the files and
# folders in the tree. Otherwise calling wipe form the builddir
# will cause a crash
for l in os.listdir(self.build_dir):
l = os.path.join(self.build_dir, l)
if os.path.isdir(l) and not os.path.islink(l):
mesonlib.windows_proof_rmtree(l)
else:
mesonlib.windows_proof_rm(l)
finally:
self.add_vcs_ignore_files(self.build_dir)
for b, f in restore:
os.makedirs(os.path.dirname(f), exist_ok=True)
shutil.move(b, f)
self.options = options
def has_build_file(self, dirname: str) -> bool:
fname = os.path.join(dirname, environment.build_filename)
return os.path.exists(fname)
def validate_core_dirs(self, dir1: str, dir2: str) -> T.Tuple[str, str]:
invalid_msg_prefix = f'Neither source directory {dir1!r} nor build directory {dir2!r}'
if dir1 is None:
if dir2 is None:
if not self.has_build_file('.') and self.has_build_file('..'):
dir2 = '..'
else:
raise MesonException('Must specify at least one directory name.')
dir1 = os.getcwd()
if dir2 is None:
dir2 = os.getcwd()
ndir1 = os.path.abspath(os.path.realpath(dir1))
ndir2 = os.path.abspath(os.path.realpath(dir2))
if not os.path.exists(ndir1) and not os.path.exists(ndir2):
raise MesonException(f'{invalid_msg_prefix} exist.')
try:
os.makedirs(ndir1, exist_ok=True)
except FileExistsError as e:
raise MesonException(f'{dir1} is not a directory') from e
try:
os.makedirs(ndir2, exist_ok=True)
except FileExistsError as e:
raise MesonException(f'{dir2} is not a directory') from e
if os.path.samefile(ndir1, ndir2):
# Fallback to textual compare if undefined entries found
has_undefined = any((s.st_ino == 0 and s.st_dev == 0) for s in (os.stat(ndir1), os.stat(ndir2)))
if not has_undefined or ndir1 == ndir2:
raise MesonException('Source and build directories must not be the same. Create a pristine build directory.')
if self.has_build_file(ndir1):
if self.has_build_file(ndir2):
raise MesonException(f'Both directories contain a build file {environment.build_filename}.')
return ndir1, ndir2
if self.has_build_file(ndir2):
return ndir2, ndir1
raise MesonException(f'{invalid_msg_prefix} contain a build file {environment.build_filename}.')
def add_vcs_ignore_files(self, build_dir: str) -> None:
with open(os.path.join(build_dir, '.gitignore'), 'w', encoding='utf-8') as ofile:
ofile.write(git_ignore_file)
with open(os.path.join(build_dir, '.hgignore'), 'w', encoding='utf-8') as ofile:
ofile.write(hg_ignore_file)
def validate_dirs(self, dir1: str, dir2: str, reconfigure: bool, wipe: bool) -> T.Tuple[str, str]:
(src_dir, build_dir) = self.validate_core_dirs(dir1, dir2)
if Path(build_dir) in Path(src_dir).parents:
raise MesonException(f'Build directory {build_dir} cannot be a parent of source directory {src_dir}')
if not os.listdir(build_dir):
self.add_vcs_ignore_files(build_dir)
return src_dir, build_dir
priv_dir = os.path.join(build_dir, 'meson-private')
has_valid_build = os.path.exists(os.path.join(priv_dir, 'coredata.dat'))
has_partial_build = os.path.isdir(priv_dir)
if has_valid_build:
if not reconfigure and not wipe:
print('Directory already configured.\n\n'
'Just run your build command (e.g. ninja) and Meson will regenerate as necessary.\n'
'If ninja fails, run "ninja reconfigure" or "meson setup --reconfigure"\n'
'to force Meson to regenerate.\n\n'
'If build failures persist, run "meson setup --wipe" to rebuild from scratch\n'
'using the same options as passed when configuring the build.\n'
'To change option values, run "meson configure" instead.')
# FIXME: This returns success and ignores new option values from CLI.
# We should either make this a hard error, or update options and
# return success.
# Note that making this an error would not be backward compatible (and also isn't
# universally agreed on): https://github.com/mesonbuild/meson/pull/4249.
raise SystemExit(0)
elif not has_partial_build and wipe:
raise MesonException(f'Directory is not empty and does not contain a previous build:\n{build_dir}')
return src_dir, build_dir
def generate(self) -> None:
env = environment.Environment(self.source_dir, self.build_dir, self.options)
mlog.initialize(env.get_log_dir(), self.options.fatal_warnings)
if self.options.profile:
mlog.set_timestamp_start(time.monotonic())
with mesonlib.BuildDirLock(self.build_dir):
self._generate(env)
def _generate(self, env: environment.Environment) -> None:
# Get all user defined options, including options that have been defined
# during a previous invocation or using meson configure.
user_defined_options = argparse.Namespace(**vars(self.options))
coredata.read_cmd_line_file(self.build_dir, user_defined_options)
mlog.debug('Build started at', datetime.datetime.now().isoformat())
mlog.debug('Main binary:', sys.executable)
mlog.debug('Build Options:', coredata.format_cmd_line_options(user_defined_options))
mlog.debug('Python system:', platform.system())
mlog.log(mlog.bold('The Meson build system'))
mlog.log('Version:', coredata.version)
mlog.log('Source dir:', mlog.bold(self.source_dir))
mlog.log('Build dir:', mlog.bold(self.build_dir))
if env.is_cross_build():
mlog.log('Build type:', mlog.bold('cross build'))
else:
mlog.log('Build type:', mlog.bold('native build'))
b = build.Build(env)
intr = interpreter.Interpreter(b, user_defined_options=user_defined_options)
# Super hack because mlog.log and mlog.debug have different signatures,
# and there is currently no way to annotate them correctly, unionize them, or
# even to write `T.Callable[[*mlog.TV_Loggable], None]`
logger_fun = T.cast('T.Callable[[mlog.TV_Loggable, mlog.TV_Loggable], None]',
(mlog.log if env.is_cross_build() else mlog.debug))
build_machine = intr.builtin['build_machine']
host_machine = intr.builtin['host_machine']
target_machine = intr.builtin['target_machine']
assert isinstance(build_machine, interpreter.MachineHolder)
assert isinstance(host_machine, interpreter.MachineHolder)
assert isinstance(target_machine, interpreter.MachineHolder)
logger_fun('Build machine cpu family:', mlog.bold(build_machine.cpu_family_method([], {})))
logger_fun('Build machine cpu:', mlog.bold(build_machine.cpu_method([], {})))
mlog.log('Host machine cpu family:', mlog.bold(host_machine.cpu_family_method([], {})))
mlog.log('Host machine cpu:', mlog.bold(host_machine.cpu_method([], {})))
logger_fun('Target machine cpu family:', mlog.bold(target_machine.cpu_family_method([], {})))
logger_fun('Target machine cpu:', mlog.bold(target_machine.cpu_method([], {})))
try:
if self.options.profile:
fname = os.path.join(self.build_dir, 'meson-private', 'profile-interpreter.log')
profile.runctx('intr.run()', globals(), locals(), filename=fname)
else:
intr.run()
except Exception as e:
mintro.write_meson_info_file(b, [e])
raise
cdf: T.Optional[str] = None
try:
dumpfile = os.path.join(env.get_scratch_dir(), 'build.dat')
# We would like to write coredata as late as possible since we use the existence of
# this file to check if we generated the build file successfully. Since coredata
# includes settings, the build files must depend on it and appear newer. However, due
# to various kernel caches, we cannot guarantee that any time in Python is exactly in
# sync with the time that gets applied to any files. Thus, we dump this file as late as
# possible, but before build files, and if any error occurs, delete it.
cdf = env.dump_coredata()
self.finalize_postconf_hooks(b, intr)
if self.options.profile:
fname = f'profile-{intr.backend.name}-backend.log'
fname = os.path.join(self.build_dir, 'meson-private', fname)
profile.runctx('intr.backend.generate()', globals(), locals(), filename=fname)
else:
intr.backend.generate()
build.save(b, dumpfile)
if env.first_invocation:
# Use path resolved by coredata because they could have been
# read from a pipe and wrote into a private file.
self.options.cross_file = env.coredata.cross_files
self.options.native_file = env.coredata.config_files
coredata.write_cmd_line_file(self.build_dir, self.options)
else:
coredata.update_cmd_line_file(self.build_dir, self.options)
# Generate an IDE introspection file with the same syntax as the already existing API
if self.options.profile:
fname = os.path.join(self.build_dir, 'meson-private', 'profile-introspector.log')
profile.runctx('mintro.generate_introspection_file(b, intr.backend)', globals(), locals(), filename=fname)
else:
mintro.generate_introspection_file(b, intr.backend)
mintro.write_meson_info_file(b, [], True)
# Post-conf scripts must be run after writing coredata or else introspection fails.
intr.backend.run_postconf_scripts()
# collect warnings about unsupported build configurations; must be done after full arg processing
# by Interpreter() init, but this is most visible at the end
if env.coredata.options[mesonlib.OptionKey('backend')].value == 'xcode':
mlog.warning('xcode backend is currently unmaintained, patches welcome')
if env.coredata.options[mesonlib.OptionKey('layout')].value == 'flat':
mlog.warning('-Dlayout=flat is unsupported and probably broken. It was a failed experiment at '
'making Windows build artifacts runnable while uninstalled, due to PATH considerations, '
'but was untested by CI and anyways breaks reasonable use of conflicting targets in different subdirs. '
'Please consider using `meson devenv` instead. See https://github.com/mesonbuild/meson/pull/9243 '
'for details.')
except Exception as e:
mintro.write_meson_info_file(b, [e])
if cdf is not None:
old_cdf = cdf + '.prev'
if os.path.exists(old_cdf):
os.replace(old_cdf, cdf)
else:
os.unlink(cdf)
raise
def finalize_postconf_hooks(self, b: build.Build, intr: interpreter.Interpreter) -> None:
b.devenv.append(intr.backend.get_devenv())
b.devenv.append(PkgConfigDependency.get_env(intr.environment, MachineChoice.HOST, uninstalled=True))
for mod in intr.modules.values():
mod.postconf_hook(b)
def run(options: T.Union[argparse.Namespace, T.List[str]]) -> int:
if not isinstance(options, argparse.Namespace):
parser = argparse.ArgumentParser()
add_arguments(parser)
options = parser.parse_args(options)
coredata.parse_cmd_line_options(options)
app = MesonApp(options)
app.generate()
return 0