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# Copyright 2019-2022 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
"""Abstractions for the LLVM/Clang compiler family."""
import os
import shutil
import typing as T
from ... import mesonlib
from ...linkers import AppleDynamicLinker, ClangClDynamicLinker, LLVMDynamicLinker, GnuGoldDynamicLinker, \
MoldDynamicLinker
from ...mesonlib import OptionKey
from ..compilers import CompileCheckMode
from .gnu import GnuLikeCompiler
if T.TYPE_CHECKING:
from ...environment import Environment
from ...dependencies import Dependency # noqa: F401
clang_color_args = {
'auto': ['-fcolor-diagnostics'],
'always': ['-fcolor-diagnostics'],
'never': ['-fno-color-diagnostics'],
} # type: T.Dict[str, T.List[str]]
clang_optimization_args = {
'plain': [],
'0': ['-O0'],
'g': ['-Og'],
'1': ['-O1'],
'2': ['-O2'],
'3': ['-O3'],
's': ['-Oz'],
} # type: T.Dict[str, T.List[str]]
class ClangCompiler(GnuLikeCompiler):
id = 'clang'
def __init__(self, defines: T.Optional[T.Dict[str, str]]):
super().__init__()
self.defines = defines or {}
self.base_options.update(
{OptionKey('b_colorout'), OptionKey('b_lto_threads'), OptionKey('b_lto_mode'), OptionKey('b_thinlto_cache'),
OptionKey('b_thinlto_cache_dir')})
# TODO: this really should be part of the linker base_options, but
# linkers don't have base_options.
if isinstance(self.linker, AppleDynamicLinker):
self.base_options.add(OptionKey('b_bitcode'))
# All Clang backends can also do LLVM IR
self.can_compile_suffixes.add('ll')
def get_colorout_args(self, colortype: str) -> T.List[str]:
return clang_color_args[colortype][:]
def has_builtin_define(self, define: str) -> bool:
return define in self.defines
def get_builtin_define(self, define: str) -> T.Optional[str]:
return self.defines.get(define)
def get_optimization_args(self, optimization_level: str) -> T.List[str]:
return clang_optimization_args[optimization_level]
def get_pch_suffix(self) -> str:
return 'pch'
def get_pch_use_args(self, pch_dir: str, header: str) -> T.List[str]:
# Workaround for Clang bug http://llvm.org/bugs/show_bug.cgi?id=15136
# This flag is internal to Clang (or at least not documented on the man page)
# so it might change semantics at any time.
return ['-include-pch', os.path.join(pch_dir, self.get_pch_name(header))]
def get_compiler_check_args(self, mode: CompileCheckMode) -> T.List[str]:
# Clang is different than GCC, it will return True when a symbol isn't
# defined in a header. Specifically this seems to have something to do
# with functions that may be in a header on some systems, but not all of
# them. `strlcat` specifically with can trigger this.
myargs: T.List[str] = ['-Werror=implicit-function-declaration']
if mode is CompileCheckMode.COMPILE:
myargs.extend(['-Werror=unknown-warning-option', '-Werror=unused-command-line-argument'])
if mesonlib.version_compare(self.version, '>=3.6.0'):
myargs.append('-Werror=ignored-optimization-argument')
return super().get_compiler_check_args(mode) + myargs
def has_function(self, funcname: str, prefix: str, env: 'Environment', *,
extra_args: T.Optional[T.List[str]] = None,
dependencies: T.Optional[T.List['Dependency']] = None) -> T.Tuple[bool, bool]:
if extra_args is None:
extra_args = []
# Starting with XCode 8, we need to pass this to force linker
# visibility to obey OS X/iOS/tvOS minimum version targets with
# -mmacosx-version-min, -miphoneos-version-min, -mtvos-version-min etc.
# https://github.com/Homebrew/homebrew-core/issues/3727
# TODO: this really should be communicated by the linker
if isinstance(self.linker, AppleDynamicLinker) and mesonlib.version_compare(self.version, '>=8.0'):
extra_args.append('-Wl,-no_weak_imports')
return super().has_function(funcname, prefix, env, extra_args=extra_args,
dependencies=dependencies)
def openmp_flags(self) -> T.List[str]:
if mesonlib.version_compare(self.version, '>=3.8.0'):
return ['-fopenmp']
elif mesonlib.version_compare(self.version, '>=3.7.0'):
return ['-fopenmp=libomp']
else:
# Shouldn't work, but it'll be checked explicitly in the OpenMP dependency.
return []
@classmethod
def use_linker_args(cls, linker: str, version: str) -> T.List[str]:
# Clang additionally can use a linker specified as a path, which GCC
# (and other gcc-like compilers) cannot. This is because clang (being
# llvm based) is retargetable, while GCC is not.
#
# qcld: Qualcomm Snapdragon linker, based on LLVM
if linker == 'qcld':
return ['-fuse-ld=qcld']
if linker == 'mold':
return ['-fuse-ld=mold']
if shutil.which(linker):
if not shutil.which(linker):
raise mesonlib.MesonException(
f'Cannot find linker {linker}.')
return [f'-fuse-ld={linker}']
return super().use_linker_args(linker, version)
def get_has_func_attribute_extra_args(self, name: str) -> T.List[str]:
# Clang only warns about unknown or ignored attributes, so force an
# error.
return ['-Werror=attributes']
def get_coverage_link_args(self) -> T.List[str]:
return ['--coverage']
def get_lto_compile_args(self, *, threads: int = 0, mode: str = 'default') -> T.List[str]:
args: T.List[str] = []
if mode == 'thin':
# ThinLTO requires the use of gold, lld, ld64, lld-link or mold 1.1+
if isinstance(self.linker, (MoldDynamicLinker)):
# https://github.com/rui314/mold/commit/46995bcfc3e3113133620bf16445c5f13cd76a18
if not mesonlib.version_compare(self.linker.version, '>=1.1'):
raise mesonlib.MesonException("LLVM's ThinLTO requires mold 1.1+")
elif not isinstance(self.linker, (AppleDynamicLinker, ClangClDynamicLinker, LLVMDynamicLinker, GnuGoldDynamicLinker)):
raise mesonlib.MesonException(f"LLVM's ThinLTO only works with gold, lld, lld-link, ld64 or mold, not {self.linker.id}")
args.append(f'-flto={mode}')
else:
assert mode == 'default', 'someone forgot to wire something up'
args.extend(super().get_lto_compile_args(threads=threads))
return args
def get_lto_link_args(self, *, threads: int = 0, mode: str = 'default',
thinlto_cache_dir: T.Optional[str] = None) -> T.List[str]:
args = self.get_lto_compile_args(threads=threads, mode=mode)
if mode == 'thin' and thinlto_cache_dir is not None:
# We check for ThinLTO linker support above in get_lto_compile_args, and all of them support
# get_thinlto_cache_args as well
args.extend(self.linker.get_thinlto_cache_args(thinlto_cache_dir))
# In clang -flto-jobs=0 means auto, and is the default if unspecified, just like in meson
if threads > 0:
if not mesonlib.version_compare(self.version, '>=4.0.0'):
raise mesonlib.MesonException('clang support for LTO threads requires clang >=4.0')
args.append(f'-flto-jobs={threads}')
return args
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