1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
# SPDX-License-Identifier: Apache-2.0
# Copyright 2019-2022 The meson development team
from __future__ import annotations
"""Abstractions for the LLVM/Clang compiler family."""
import os
import shutil
import typing as T
from ... import mesonlib
from ...linkers.linkers import AppleDynamicLinker, ClangClDynamicLinker, LLVMDynamicLinker, GnuGoldDynamicLinker, \
MoldDynamicLinker, MSVCDynamicLinker
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: T.Dict[str, T.List[str]] = {
'auto': ['-fdiagnostics-color=auto'],
'always': ['-fdiagnostics-color=always'],
'never': ['-fdiagnostics-color=never'],
}
clang_optimization_args: T.Dict[str, T.List[str]] = {
'plain': [],
'0': ['-O0'],
'g': ['-Og'],
'1': ['-O1'],
'2': ['-O2'],
'3': ['-O3'],
's': ['-Oz'],
}
clang_lang_map = {
'c': 'c',
'cpp': 'c++',
'objc': 'objective-c',
'objcpp': 'objective-c++',
}
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 is caused by a functionality
# both GCC and clang have: for some "well known" functions, arbitrarily
# chosen, they provide fixit suggestions for the header you should try
# including.
#
# - With GCC, this is a note appended to the prexisting diagnostic
# "error: undeclared identifier"
#
# - With clang, the error is converted to a c89'ish implicit function
# declaration instead, which can be disabled with -Wno-error and on
# clang < 16, simply passes compilation by default.
#
# One example of a clang fixit suggestion is for `strlcat`, which
# triggers this.
#
# This was reported in 2017 and promptly fixed. Just kidding!
# https://github.com/llvm/llvm-project/issues/33905
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 []
def gen_vs_module_defs_args(self, defsfile: str) -> T.List[str]:
if isinstance(self.linker, (MSVCDynamicLinker)):
# With MSVC, DLLs only export symbols that are explicitly exported,
# so if a module defs file is specified, we use that to export symbols
return ['-Wl,/DEF:' + defsfile]
return super().gen_vs_module_defs_args(defsfile)
@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 linker_to_compiler_args(self, args: T.List[str]) -> T.List[str]:
if isinstance(self.linker, (ClangClDynamicLinker, MSVCDynamicLinker)):
return [flag if flag.startswith('-Wl,') else f'-Wl,{flag}' for flag in args]
else:
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
|
