[英]Distutils: build multiple Python extension modules (written in Swig) that share a method
我有四个 C++ 文件:Ah、A.cpp、Bh、B.cpp,Ah 包含在 B.cpp 中
啊:
#pragma once
void A();
A.cpp:
#include <iostream>
void A() {
std::cout << "A" << std::endl;
}
乙:
#pragma once
void B();
B.cpp:
#include "A.h"
#include <iostream>
void B() {
A();
std::cout << "B" << std::endl;
}
现在我写了两个 SWIG 接口文件 Ai 和 Bi
艾:
%module A
%{
#include "A.h"
%}
%include "A.h"
双:
%module B
%{
#include "B.h"
%}
%include "B.h"
setup.py 文件是:
from distutils.core import setup, Extension
A_ext = Extension( "_A", [ "A.i", "A.cpp", ], swig_opts = ['-c++'], extra_compile_args = ['-g'])
B_ext = Extension( "_B", [ "B.i", "B.cpp", ], swig_opts = ['-c++'], extra_compile_args = ['-g'])
setup(
name = "test",
version = "1.0",
ext_modules = [ A_ext, B_ext ],
py_modules = [ "A", "B" ]
)
如果我在下面输入命令,它会显示“A”。
python -c 'import A; A.A()'
如果我在下面键入命令,则会出现分段错误:
python -c 'import B; B.B()'
我该怎么做才能正确运行此命令? 由于我不想多次编译B.cpp,除了下面的方法之外还有其他方法吗?
B_ext = Extension( "_B", [ "B.i", "A.cpp", "B.cpp", ], swig_opts = ['-c++'], extra_compile_args = ['-g'])
为了清楚起见,我稍微更改了您的文件。
啊:
#pragma once
void funcA();
a.cpp :
#include <iostream>
void funcA() {
std::cout << __FILE__ << " " << __LINE__ << " " << __FUNCTION__ << std::endl;
}
艾:
%module a
%{
#include "a.h"
%}
%include "a.h"
哈:
#pragma once
void funcB();
b.cpp :
#include "a.h"
#include <iostream>
void funcB() {
std::cout << __FILE__ << " " << __LINE__ << " " << __FUNCTION__ << std::endl;
funcA();
}
双:
%module b
%{
#include "b.h"
%}
%include "b.h"
设置.py :
from distutils.core import setup
from distutils.extension import Extension
a = "a"
b = "b"
ext_a = Extension("_" + a, [a + ".i", a + ".cpp"], swig_opts=("-c++",), extra_compile_args=["-g"])
ext_b = Extension("_" + b, [b + ".i", b + ".cpp"], swig_opts=("-c++",), extra_compile_args=["-g"])
setup(
name="test",
version="1.0",
ext_modules=[ext_a, ext_b],
py_modules=[a, b]
)
调用b.funcB时会发生什么(简化)(只有stacktrace ,导入被搁置一旁)。 每个步骤调用下一个:
问题是第 4步中的代码。 不在模块_b 中,它将在运行时失败。 但事情有点奇怪:调用funcB时不会出现故障(核心转储),而是在模块( b -> _b )导入时出现(我认为这是因为swig的幕后魔术),如见下。
输出:
[cfati@cfati-ubtu16x64-0:~/Work/Dev/StackOverflow/q050938128]> ~/sopr.sh *** Set shorter prompt to better fit when pasted in StackOverflow (or other) pages *** [064bit prompt]> ls a.cpp ah ai b.cpp bh bi setup.py [064bit prompt]> python3 setup.py build > /dev/null 2>&1 [064bit prompt]> echo $? 0 [064bit prompt]> ls a.cpp ah ai a.py a_wrap.cpp b.cpp bh bi b.py build b_wrap.cpp setup.py [064bit prompt]> ls ./build/lib.linux-x86_64-3.5 _a.cpython-35m-x86_64-linux-gnu.so _b.cpython-35m-x86_64-linux-gnu.so [064bit prompt]> PYTHONPATH=${PYTHONPATH}:./build/lib.linux-x86_64-3.5 python3 -c "import _a;_a.funcA()" a.cpp 6 funcA [064bit prompt]> PYTHONPATH=${PYTHONPATH}:./build/lib.linux-x86_64-3.5 python3 -c "import _b" Segmentation fault (core dumped)
为了解决它,要么:
显然,选项#3。 是完美的候选人。 但是distutils ( [Python.Docs]: API Reference ) 没有提供所需的功能OOTB (显然构建一个扩展模块和它依赖的外部共享库,这不是distutils 的目标场景),或者至少,我找不到任何。
有一个build_clib模块,它提供构建静态库的功能(由扩展模块使用),但这与选项#1相同。 .
设置.py :
import sys
import os
from distutils.core import setup
from distutils.extension import Extension
from distutils.command.build_clib import build_clib
from distutils.command.build_ext import build_ext
from distutils.ccompiler import CCompiler
__win = sys.platform[:3].lower() == "win"
export_symbols_option = "export_symbols"
class build_clib_dyn(build_clib):
def finalize_options(self):
self.set_undefined_options('build',
('build_lib', 'build_clib'),
('build_temp', 'build_temp'),
('compiler', 'compiler'),
('debug', 'debug'),
('force', 'force'))
self.libraries = self.distribution.libraries
if self.libraries:
self.check_library_list(self.libraries)
if self.include_dirs is None:
self.include_dirs = self.distribution.include_dirs or []
if isinstance(self.include_dirs, str):
self.include_dirs = self.include_dirs.split(os.pathsep)
def build_libraries(self, libraries):
for (lib_name, build_info) in libraries:
sources = build_info.get('sources')
if sources is None or not isinstance(sources, (list, tuple)):
raise DistutilsSetupError(
"in 'libraries' option (library '%s'), "
"'sources' must be present and must be "
"a list of source filenames" % lib_name)
sources = list(sources)
macros = build_info.get('macros')
include_dirs = build_info.get('include_dirs')
objects = self.compiler.compile(sources,
output_dir=self.build_temp,
macros=macros,
include_dirs=include_dirs,
debug=self.debug)
self.compiler.link(CCompiler.SHARED_OBJECT, objects, self.compiler.library_filename(lib_name, lib_type="shared"),
output_dir=self.build_clib,
export_symbols=build_info.get(export_symbols_option),
debug=self.debug)
if __win:
class build_ext_w_dyn_dep(build_ext):
def finalize_options(self):
super(build_ext_w_dyn_dep, self).finalize_options()
self.library_dirs.append(os.path.dirname(self.build_temp))
else:
class build_ext_w_dyn_dep(build_ext):
pass
a_name = "a"
b_name = "b"
common_name = a_name + b_name + "common"
swig_opts = ["-c++"]
libraries = [common_name]
lib_common_build_info = {"sources": [a_name + ".cpp"]}
if __win:
extra_compile_args = None
extra_link_args = None
lib_common_build_info[export_symbols_option] = ["funcA"]
else:
extra_compile_args = ["-g"]
extra_link_args = ["-Wl,-rpath,${ORIGIN}"]
lib_common_info = (common_name, lib_common_build_info)
ext_a = Extension("_" + a_name, [a_name + ".i"], libraries=libraries, extra_compile_args=extra_compile_args, extra_link_args=extra_link_args, swig_opts=swig_opts)
ext_b = Extension("_" + b_name, [b_name + ".i", b_name + ".cpp"], libraries=libraries, extra_compile_args=extra_compile_args, extra_link_args=extra_link_args, swig_opts=swig_opts)
setup(
name="test",
version="1.0",
libraries=[lib_common_info],
cmdclass={"build_clib": build_clib_dyn, "build_ext": build_ext_w_dyn_dep},
ext_modules=[ext_a, ext_b],
py_modules=[a_name, b_name]
)
注意事项:
输出(再次运行上述命令):
[064bit prompt]> ls a.cpp ah ai b.cpp bh bi setup.py [064bit prompt]> python3 setup.py build > /dev/null 2>&1 [064bit prompt]> echo $? 0 [064bit prompt]> ls a.cpp ah ai a.py a_wrap.cpp b.cpp bh bi b.py build b_wrap.cpp setup.py [064bit prompt]> ls build/lib.linux-x86_64-3.5/ _a.cpython-35m-x86_64-linux-gnu.so _b.cpython-35m-x86_64-linux-gnu.so libabcommon.so [064bit prompt]> ldd build/lib.linux-x86_64-3.5/_a.cpython-35m-x86_64-linux-gnu.so linux-vdso.so.1 => (0x00007fffadb49000) libabcommon.so => /home/cfati/Work/Dev/StackOverflow/q050938128/build/lib.linux-x86_64-3.5/libabcommon.so (0x00007f91cd50f000) libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f91cd18d000) libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f91ccf77000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f91ccbad000) libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f91cc990000) libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f91cc687000) /lib64/ld-linux-x86-64.so.2 (0x00007f91cd916000) [064bit prompt]> PYTHONPATH=${PYTHONPATH}:./build/lib.linux-x86_64-3.5 python3 -c "import _a;_a.funcA()" a.cpp 6 funcA [064bit prompt]> PYTHONPATH=${PYTHONPATH}:./build/lib.linux-x86_64-3.5 python3 -c "import _b;_b.funcB()" b.cpp 7 funcB a.cpp 6 funcA
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