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# SPDX-License-Identifier: GPL-2.0
"""Setup script for perf python extension.
This script is used to build and install the perf python binding.
It handles compiler-specific flags, especially for clang, and configures
the setuptools Extension.
"""
import os
import shlex
import shutil
import subprocess
import sysconfig
from setuptools import setup, Extension
from setuptools.command.build_ext import build_ext as _build_ext
from setuptools.command.install_lib import install_lib as _install_lib
def clang_has_option(cc: str, cc_args: list[str], src_feature_tests: str, option: str) -> bool:
"""Check if clang supports a specific option.
Args:
cc: The compiler executable.
cc_args: Compiler arguments from CC environment variable.
src_feature_tests: Path to the feature tests directory.
option: The compiler option to check (e.g., "-mcet").
Returns:
True if the option is supported, False otherwise.
"""
error_substrings = (
b"unknown argument",
b"is not supported",
b"unknown warning option"
)
cmd = [cc] + cc_args + [
option,
"-o", "/dev/null",
os.path.join(src_feature_tests, "test-hello.c")
]
try:
res = subprocess.run(cmd, stderr=subprocess.PIPE, stdout=subprocess.DEVNULL, check=False)
cc_output = res.stderr.splitlines()
except OSError:
return False
return not any(any(error in line for error in error_substrings) for line in cc_output)
def filter_clang_options(cc: str, cc_args: list[str], src_feature_tests: str) -> None:
"""Filter out unsupported clang options from sysconfig CFLAGS and OPT.
Args:
cc: The compiler executable.
cc_args: Compiler arguments from CC environment variable.
src_feature_tests: Path to the feature tests directory.
"""
config_vars = sysconfig.get_config_vars()
for var in ('CFLAGS', 'OPT'):
if var not in config_vars:
continue
# Split into individual flags using shlex to preserve quoted arguments
flags = shlex.split(config_vars[var])
# Remove -specs=...
flags = [f for f in flags if not f.startswith("-specs=")]
options = (
"-mcet",
"-fcf-protection",
"-fstack-clash-protection",
"-fstack-protector-strong",
"-fno-semantic-interposition",
"-ffat-lto-objects",
"-ftree-loop-distribute-patterns",
"-gno-variable-location-views"
)
for option in options:
if not clang_has_option(cc, cc_args, src_feature_tests, option):
# Remove the option and any variant (e.g. -option=...)
flags = [f for f in flags if not f.startswith(option)]
# Re-join flags preserving quoting
config_vars[var] = shlex.join(flags)
class BuildExt(_build_ext):
"""Custom build_ext command to set output directories."""
def __init__(self, *args, **kwargs):
self.build_lib = None
self.build_temp = None
super().__init__(*args, **kwargs)
def finalize_options(self) -> None:
_build_ext.finalize_options(self)
build_lib = os.getenv('PYTHON_EXTBUILD_LIB')
build_tmp = os.getenv('PYTHON_EXTBUILD_TMP')
if build_lib:
self.build_lib = build_lib
if build_tmp:
self.build_temp = build_tmp
class InstallLib(_install_lib):
"""Custom install_lib command to set output directory."""
def __init__(self, *args, **kwargs):
self.build_dir = None
super().__init__(*args, **kwargs)
def finalize_options(self) -> None:
_install_lib.finalize_options(self)
build_lib = os.getenv('PYTHON_EXTBUILD_LIB')
if build_lib:
self.build_dir = build_lib
def run(self):
_install_lib.run(self)
srctree = os.getenv('srctree', '.')
src_perf = os.path.join(srctree, 'tools/perf')
shutil.copy2(os.path.join(src_perf, 'python/perf.pyi'), self.install_dir)
def main() -> None:
"""Main entry point for the setup script."""
cc_env = os.getenv("CC")
assert cc_env, "Environment variable CC not set"
# Safe parsing of CC environment variable which might contain options/quotes
cc_tokens = shlex.split(cc_env)
cc = cc_tokens[0]
cc_args = cc_tokens[1:]
# Run CC -v to check if it is clang.
try:
cc_info = subprocess.run(
[cc, "-v"], stderr=subprocess.PIPE, stdout=subprocess.DEVNULL, check=False
)
cc_is_clang = b"clang version" in cc_info.stderr
except OSError as e:
raise RuntimeError(f"Failed to execute compiler '{cc}': {e}") from e
srctree = os.getenv('srctree')
assert srctree, "Environment variable srctree, for the Linux sources, not set"
src_feature_tests = f'{srctree}/tools/build/feature'
if cc_is_clang:
filter_clang_options(cc, cc_args, src_feature_tests)
# switch off several checks (need to be at the end of cflags list)
cflags = [
'-fno-strict-aliasing',
'-Wno-write-strings',
'-Wno-unused-parameter',
'-Wno-redundant-decls'
]
if cc_is_clang:
cflags += ["-Wno-unused-command-line-argument"]
if clang_has_option(
cc, cc_args, src_feature_tests, "-Wno-cast-function-type-mismatch"
):
cflags += ["-Wno-cast-function-type-mismatch"]
else:
cflags += ['-Wno-cast-function-type']
# The python headers have mixed code with declarations (decls after asserts, for instance)
cflags += ["-Wno-declaration-after-statement"]
src_perf = f'{srctree}/tools/perf'
perf = Extension(
'perf',
sources=[os.path.join(src_perf, 'util/python.c')],
include_dirs=['util/include'],
extra_compile_args=cflags,
)
setup(
name='perf',
version='0.1',
description='Interface with the Linux profiling infrastructure',
author='Arnaldo Carvalho de Melo',
author_email='acme@redhat.com',
license='GPLv2',
url='http://perf.wiki.kernel.org',
ext_modules=[perf],
cmdclass={'build_ext': BuildExt, 'install_lib': InstallLib},
)
if __name__ == '__main__':
main()
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