The Meson Build System
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402 lines
16 KiB
402 lines
16 KiB
# SPDX-License-Identifier: Apache-2.0 |
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# Copyright 2022 The Meson development team |
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from __future__ import annotations |
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import sys, os, subprocess, shutil |
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import shlex |
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import typing as T |
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from .. import envconfig |
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from .. import mlog |
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from ..compilers import compilers |
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from ..compilers.detect import defaults as compiler_names |
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if T.TYPE_CHECKING: |
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import argparse |
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def has_for_build() -> bool: |
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for cenv in envconfig.ENV_VAR_COMPILER_MAP.values(): |
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if os.environ.get(cenv + '_FOR_BUILD'): |
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return True |
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return False |
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# Note: when adding arguments, please also add them to the completion |
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# scripts in $MESONSRC/data/shell-completions/ |
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def add_arguments(parser: 'argparse.ArgumentParser') -> None: |
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parser.add_argument('--debarch', default=None, |
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help='The dpkg architecture to generate.') |
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parser.add_argument('--gccsuffix', default="", |
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help='A particular gcc version suffix if necessary.') |
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parser.add_argument('-o', required=True, dest='outfile', |
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help='The output file.') |
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parser.add_argument('--cross', default=False, action='store_true', |
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help='Generate a cross compilation file.') |
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parser.add_argument('--native', default=False, action='store_true', |
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help='Generate a native compilation file.') |
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parser.add_argument('--system', default=None, |
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help='Define system for cross compilation.') |
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parser.add_argument('--subsystem', default=None, |
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help='Define subsystem for cross compilation.') |
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parser.add_argument('--kernel', default=None, |
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help='Define kernel for cross compilation.') |
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parser.add_argument('--cpu', default=None, |
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help='Define cpu for cross compilation.') |
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parser.add_argument('--cpu-family', default=None, |
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help='Define cpu family for cross compilation.') |
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parser.add_argument('--endian', default='little', choices=['big', 'little'], |
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help='Define endianness for cross compilation.') |
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class MachineInfo: |
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def __init__(self) -> None: |
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self.compilers: T.Dict[str, T.List[str]] = {} |
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self.binaries: T.Dict[str, T.List[str]] = {} |
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self.properties: T.Dict[str, T.Union[str, T.List[str]]] = {} |
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self.compile_args: T.Dict[str, T.List[str]] = {} |
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self.link_args: T.Dict[str, T.List[str]] = {} |
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self.cmake: T.Dict[str, T.Union[str, T.List[str]]] = {} |
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self.system: T.Optional[str] = None |
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self.subsystem: T.Optional[str] = None |
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self.kernel: T.Optional[str] = None |
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self.cpu: T.Optional[str] = None |
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self.cpu_family: T.Optional[str] = None |
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self.endian: T.Optional[str] = None |
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#parser = argparse.ArgumentParser(description='''Generate cross compilation definition file for the Meson build system. |
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# |
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#If you do not specify the --arch argument, Meson assumes that running |
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#plain 'dpkg-architecture' will return correct information for the |
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#host system. |
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# |
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#This script must be run in an environment where CPPFLAGS et al are set to the |
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#same values used in the actual compilation. |
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#''' |
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#) |
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def locate_path(program: str) -> T.List[str]: |
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if os.path.isabs(program): |
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return [program] |
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for d in os.get_exec_path(): |
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f = os.path.join(d, program) |
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if os.access(f, os.X_OK): |
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return [f] |
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raise ValueError("%s not found on $PATH" % program) |
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def write_args_line(ofile: T.TextIO, name: str, args: T.Union[str, T.List[str]]) -> None: |
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if len(args) == 0: |
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return |
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if isinstance(args, str): |
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ostr = name + "= '" + args + "'\n" |
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else: |
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ostr = name + ' = [' |
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ostr += ', '.join("'" + i + "'" for i in args) |
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ostr += ']\n' |
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ofile.write(ostr) |
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def get_args_from_envvars(infos: MachineInfo) -> None: |
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cppflags = shlex.split(os.environ.get('CPPFLAGS', '')) |
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cflags = shlex.split(os.environ.get('CFLAGS', '')) |
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cxxflags = shlex.split(os.environ.get('CXXFLAGS', '')) |
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objcflags = shlex.split(os.environ.get('OBJCFLAGS', '')) |
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objcxxflags = shlex.split(os.environ.get('OBJCXXFLAGS', '')) |
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ldflags = shlex.split(os.environ.get('LDFLAGS', '')) |
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c_args = cppflags + cflags |
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cpp_args = cppflags + cxxflags |
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c_link_args = cflags + ldflags |
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cpp_link_args = cxxflags + ldflags |
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objc_args = cppflags + objcflags |
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objcpp_args = cppflags + objcxxflags |
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objc_link_args = objcflags + ldflags |
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objcpp_link_args = objcxxflags + ldflags |
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if c_args: |
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infos.compile_args['c'] = c_args |
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if c_link_args: |
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infos.link_args['c'] = c_link_args |
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if cpp_args: |
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infos.compile_args['cpp'] = cpp_args |
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if cpp_link_args: |
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infos.link_args['cpp'] = cpp_link_args |
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if objc_args: |
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infos.compile_args['objc'] = objc_args |
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if objc_link_args: |
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infos.link_args['objc'] = objc_link_args |
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if objcpp_args: |
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infos.compile_args['objcpp'] = objcpp_args |
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if objcpp_link_args: |
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infos.link_args['objcpp'] = objcpp_link_args |
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deb_cpu_family_map = { |
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'mips64el': 'mips64', |
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'i686': 'x86', |
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'powerpc64le': 'ppc64', |
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} |
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deb_cpu_map = { |
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'armhf': 'arm7hlf', |
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'mips64el': 'mips64', |
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'powerpc64le': 'ppc64', |
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} |
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def deb_detect_cmake(infos: MachineInfo, data: T.Dict[str, str]) -> None: |
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system_name_map = {'linux': 'Linux', 'kfreebsd': 'kFreeBSD', 'hurd': 'GNU'} |
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system_processor_map = {'arm': 'armv7l', 'mips64el': 'mips64', 'powerpc64le': 'ppc64le'} |
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infos.cmake["CMAKE_C_COMPILER"] = infos.compilers['c'] |
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try: |
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infos.cmake["CMAKE_CXX_COMPILER"] = infos.compilers['cpp'] |
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except KeyError: |
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pass |
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infos.cmake["CMAKE_SYSTEM_NAME"] = system_name_map[data['DEB_HOST_ARCH_OS']] |
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infos.cmake["CMAKE_SYSTEM_PROCESSOR"] = system_processor_map.get(data['DEB_HOST_GNU_CPU'], |
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data['DEB_HOST_GNU_CPU']) |
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def deb_compiler_lookup(infos: MachineInfo, compilerstems: T.List[T.Tuple[str, str]], host_arch: str, gccsuffix: str) -> None: |
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for langname, stem in compilerstems: |
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compilername = f'{host_arch}-{stem}{gccsuffix}' |
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try: |
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p = locate_path(compilername) |
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infos.compilers[langname] = p |
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except ValueError: |
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pass |
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def detect_cross_debianlike(options: T.Any) -> MachineInfo: |
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if options.debarch == 'auto': |
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cmd = ['dpkg-architecture'] |
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else: |
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cmd = ['dpkg-architecture', '-a' + options.debarch] |
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output = subprocess.check_output(cmd, universal_newlines=True, |
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stderr=subprocess.DEVNULL) |
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data = {} |
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for line in output.split('\n'): |
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line = line.strip() |
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if line == '': |
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continue |
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k, v = line.split('=', 1) |
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data[k] = v |
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host_arch = data['DEB_HOST_GNU_TYPE'] |
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host_os = data['DEB_HOST_ARCH_OS'] |
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host_subsystem = host_os |
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host_kernel = 'linux' |
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host_cpu_family = deb_cpu_family_map.get(data['DEB_HOST_GNU_CPU'], |
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data['DEB_HOST_GNU_CPU']) |
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host_cpu = deb_cpu_map.get(data['DEB_HOST_ARCH'], |
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data['DEB_HOST_ARCH']) |
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host_endian = data['DEB_HOST_ARCH_ENDIAN'] |
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compilerstems = [('c', 'gcc'), |
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('cpp', 'g++'), |
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('objc', 'gobjc'), |
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('objcpp', 'gobjc++')] |
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infos = MachineInfo() |
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deb_compiler_lookup(infos, compilerstems, host_arch, options.gccsuffix) |
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if len(infos.compilers) == 0: |
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print('Warning: no compilers were detected.') |
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infos.binaries['ar'] = locate_path("%s-ar" % host_arch) |
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infos.binaries['strip'] = locate_path("%s-strip" % host_arch) |
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infos.binaries['objcopy'] = locate_path("%s-objcopy" % host_arch) |
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infos.binaries['ld'] = locate_path("%s-ld" % host_arch) |
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try: |
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infos.binaries['cmake'] = locate_path("cmake") |
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deb_detect_cmake(infos, data) |
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except ValueError: |
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pass |
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try: |
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infos.binaries['pkg-config'] = locate_path("%s-pkg-config" % host_arch) |
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except ValueError: |
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pass # pkg-config is optional |
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try: |
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infos.binaries['cups-config'] = locate_path("cups-config") |
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except ValueError: |
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pass |
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infos.system = host_os |
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infos.subsystem = host_subsystem |
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infos.kernel = host_kernel |
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infos.cpu_family = host_cpu_family |
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infos.cpu = host_cpu |
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infos.endian = host_endian |
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get_args_from_envvars(infos) |
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return infos |
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def write_machine_file(infos: MachineInfo, ofilename: str, write_system_info: bool) -> None: |
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tmpfilename = ofilename + '~' |
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with open(tmpfilename, 'w', encoding='utf-8') as ofile: |
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ofile.write('[binaries]\n') |
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ofile.write('# Compilers\n') |
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for langname in sorted(infos.compilers.keys()): |
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compiler = infos.compilers[langname] |
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write_args_line(ofile, langname, compiler) |
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ofile.write('\n') |
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ofile.write('# Other binaries\n') |
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for exename in sorted(infos.binaries.keys()): |
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exe = infos.binaries[exename] |
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write_args_line(ofile, exename, exe) |
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ofile.write('\n') |
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ofile.write('[built-in options]\n') |
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all_langs = list(set(infos.compile_args.keys()).union(set(infos.link_args.keys()))) |
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all_langs.sort() |
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for lang in all_langs: |
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if lang in infos.compile_args: |
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write_args_line(ofile, lang + '_args', infos.compile_args[lang]) |
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if lang in infos.link_args: |
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write_args_line(ofile, lang + '_link_args', infos.link_args[lang]) |
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ofile.write('\n') |
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ofile.write('[properties]\n') |
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for k, v in infos.properties.items(): |
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write_args_line(ofile, k, v) |
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ofile.write('\n') |
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if infos.cmake: |
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ofile.write('[cmake]\n\n') |
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for k, v in infos.cmake.items(): |
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write_args_line(ofile, k, v) |
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ofile.write('\n') |
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if write_system_info: |
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ofile.write('[host_machine]\n') |
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ofile.write(f"cpu = '{infos.cpu}'\n") |
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ofile.write(f"cpu_family = '{infos.cpu_family}'\n") |
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ofile.write(f"endian = '{infos.endian}'\n") |
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ofile.write(f"system = '{infos.system}'\n") |
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if infos.subsystem: |
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ofile.write(f"subsystem = '{infos.subsystem}'\n") |
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if infos.kernel: |
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ofile.write(f"kernel = '{infos.kernel}'\n") |
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os.replace(tmpfilename, ofilename) |
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def detect_language_args_from_envvars(langname: str, envvar_suffix: str = '') -> T.Tuple[T.List[str], T.List[str]]: |
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compile_args = [] |
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if langname in compilers.CFLAGS_MAPPING: |
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compile_args = shlex.split(os.environ.get(compilers.CFLAGS_MAPPING[langname] + envvar_suffix, '')) |
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if langname in compilers.LANGUAGES_USING_CPPFLAGS: |
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cppflags = tuple(shlex.split(os.environ.get('CPPFLAGS' + envvar_suffix, ''))) |
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lang_compile_args = list(cppflags) + compile_args |
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else: |
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lang_compile_args = compile_args |
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lang_link_args = [] |
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if langname in compilers.LANGUAGES_USING_LDFLAGS: |
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lang_link_args += shlex.split(os.environ.get('LDFLAGS' + envvar_suffix, '')) |
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lang_link_args += compile_args |
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return (lang_compile_args, lang_link_args) |
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def detect_compilers_from_envvars(envvar_suffix: str = '') -> MachineInfo: |
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infos = MachineInfo() |
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for langname, envvarname in envconfig.ENV_VAR_COMPILER_MAP.items(): |
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compilerstr = os.environ.get(envvarname + envvar_suffix) |
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if not compilerstr: |
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continue |
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if os.path.exists(compilerstr): |
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compiler = [compilerstr] |
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else: |
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compiler = shlex.split(compilerstr) |
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infos.compilers[langname] = compiler |
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lang_compile_args, lang_link_args = detect_language_args_from_envvars(langname, envvar_suffix) |
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if lang_compile_args: |
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infos.compile_args[langname] = lang_compile_args |
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if lang_link_args: |
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infos.link_args[langname] = lang_link_args |
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return infos |
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def detect_binaries_from_envvars(infos: MachineInfo, envvar_suffix: str = '') -> None: |
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for binname, envvar_base in envconfig.ENV_VAR_TOOL_MAP.items(): |
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envvar = envvar_base + envvar_suffix |
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binstr = os.environ.get(envvar) |
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if binstr: |
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infos.binaries[binname] = shlex.split(binstr) |
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def detect_properties_from_envvars(infos: MachineInfo, envvar_suffix: str = '') -> None: |
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var = os.environ.get('PKG_CONFIG_LIBDIR' + envvar_suffix) |
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if var is not None: |
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infos.properties['pkg_config_libdir'] = var |
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var = os.environ.get('PKG_CONFIG_SYSROOT_DIR' + envvar_suffix) |
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if var is not None: |
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infos.properties['sys_root'] = var |
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def detect_cross_system(infos: MachineInfo, options: T.Any) -> None: |
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for optname in ('system', 'subsystem', 'kernel', 'cpu', 'cpu_family', 'endian'): |
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v = getattr(options, optname) |
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if not v: |
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mlog.error(f'Cross property "{optname}" missing, set it with --{optname.replace("_", "-")}.') |
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sys.exit(1) |
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setattr(infos, optname, v) |
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def detect_cross_env(options: T.Any) -> MachineInfo: |
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if options.debarch: |
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print('Detecting cross environment via dpkg-reconfigure.') |
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infos = detect_cross_debianlike(options) |
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else: |
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print('Detecting cross environment via environment variables.') |
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infos = detect_compilers_from_envvars() |
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detect_cross_system(infos, options) |
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detect_binaries_from_envvars(infos) |
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detect_properties_from_envvars(infos) |
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return infos |
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def add_compiler_if_missing(infos: MachineInfo, langname: str, exe_names: T.List[str]) -> None: |
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if langname in infos.compilers: |
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return |
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for exe_name in exe_names: |
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lookup = shutil.which(exe_name) |
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if not lookup: |
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continue |
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compflags, linkflags = detect_language_args_from_envvars(langname) |
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infos.compilers[langname] = [lookup] |
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if compflags: |
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infos.compile_args[langname] = compflags |
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if linkflags: |
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infos.link_args[langname] = linkflags |
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return |
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def detect_missing_native_compilers(infos: MachineInfo) -> None: |
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# T.Any per-platform special detection should go here. |
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for langname, exes in compiler_names.items(): |
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if langname not in envconfig.ENV_VAR_COMPILER_MAP: |
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continue |
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add_compiler_if_missing(infos, langname, exes) |
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def detect_missing_native_binaries(infos: MachineInfo) -> None: |
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# T.Any per-platform special detection should go here. |
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for toolname in sorted(envconfig.ENV_VAR_TOOL_MAP.keys()): |
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if toolname in infos.binaries: |
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continue |
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exe = shutil.which(toolname) |
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if exe: |
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infos.binaries[toolname] = [exe] |
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def detect_native_env(options: T.Any) -> MachineInfo: |
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use_for_build = has_for_build() |
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if use_for_build: |
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mlog.log('Using FOR_BUILD envvars for detection') |
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esuffix = '_FOR_BUILD' |
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else: |
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mlog.log('Using regular envvars for detection.') |
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esuffix = '' |
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infos = detect_compilers_from_envvars(esuffix) |
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detect_missing_native_compilers(infos) |
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detect_binaries_from_envvars(infos, esuffix) |
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detect_missing_native_binaries(infos) |
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detect_properties_from_envvars(infos, esuffix) |
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return infos |
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def run(options: T.Any) -> None: |
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if options.cross and options.native: |
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sys.exit('You can only specify either --cross or --native, not both.') |
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if not options.cross and not options.native: |
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sys.exit('You must specify --cross or --native.') |
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mlog.notice('This functionality is experimental and subject to change.') |
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detect_cross = options.cross |
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if detect_cross: |
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infos = detect_cross_env(options) |
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write_system_info = True |
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else: |
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infos = detect_native_env(options) |
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write_system_info = False |
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write_machine_file(infos, options.outfile, write_system_info)
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