setup.py检查是否存在非python库依赖项 [英] setup.py check if non-python library dependency exists

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问题描述

我正在尝试为 cgal-bindings 建立setup.py。要安装此版本,用户需要至少具有特定版本的CGAL。此外,如果用户具有某些库(例如Eigen3),则应构建一些可选目标CGAL。 Python中是否有跨平台的方法来检查这一点?



我可以在 ctypes.util find_library c>检查该库是否存在,但没有找到获取版本的任何简便方法。 <-实际上这并不是一直有效,某些库仅是标头,例如eigen3,它是C ++模板库。



仅使用 setup() install_requires 自变量适用于Python库,而CGAL是C / C ++库。

解决方案

是否应根据某些库版本的可用性来编译特定的扩展模块,可以通过动态生成< setup.py setup()的code> ext_modules 个参数。 / p>

对于 ruamel.yaml _yaml.so 模块,只有在我执行的系统上安装了 libyaml 开发库时,才应编译该文件:

  import from textwrap import dent 

def check_extensions():
检查是否可以通过尝试编译C来构建C模块针对libyaml开发库的小型
程序

导入临时文件
导入shutdownil

导入distutils.sysconfig
导入distutils.ccompiler来自distutils.errors的
导入CompileError,LinkError

库= ['yaml']

#写一个tempora ry .c文件来编译
c_code = dedent(
#include< yaml.h>

int main(int argc,char * argv [])
{
yaml_parser_t解析器;
parser =解析器; / *防止警告* /
返回0;
}

tmp_dir = tempfile.mkdtemp(前缀='tmp_ruamel_yaml_')
bin_file_name = os.path.join(tmp_dir,'test_yaml')
file_name = bin_file_name +'.c'
以open(file_name,'w')as fp:
fp.write(c_code)

#并尝试编译
编译器= distutils.ccompiler.new_compiler()
断言isinstance(编译器,distutils.ccompiler.CCompiler)
distutils.sysconfig.customize_compiler(compiler)

try:
Compiler.link_executable(
Compiler.compile([file_name]),
bin_file_name,
library = libraries,

除了CompileError:
print('libyaml编译错误')
ret_val =无
除外LinkError:
print('libyaml链接错误')
ret_val =无
其他:
ret_val = [
扩展名(
'_yaml',
来源= ['ext / _yaml.c'],
库=库,
),
]
shutil.rmtree(tmp_dir)
return ret_val

这样,您不需要分发中的其他文件。即使您不能在编译时根据版本号进行编译,您也应该
能够从临时目录运行生成的程序并检查退出值和/或输出。


I'm trying to make a setup.py for cgal-bindings. To install this, the user needs to have at least a certain version of CGAL. In addition, CGAL has a few optional targets that should be built if the user has some libraries (like Eigen3). Is there a cross-platform way in Python to check for this?

I can use find_library in ctypes.util to check if the library exists, but I don't see any easy way to get the version. <-- This doesn't actually work all the time, some libraries are header-only like eigen3, which is a C++ template library.

Using the install_requires argument of setup() only works for Python libraries and CGAL is a C/C++ library.

解决方案

Whether a particular extension module should be compiled depending on the availability of some library version, can be accomplished by dynamically generating the ext_modules argument of setup() in setup.py.

For the _yaml.so module of ruamel.yaml, that only should be compiled when the libyaml development libraries have been installed on the system I do:

import os
from textwrap import dedent

def check_extensions():
    """check if the C module can be build by trying to compile a small 
    program against the libyaml development library"""

    import tempfile
    import shutil

    import distutils.sysconfig
    import distutils.ccompiler
    from distutils.errors import CompileError, LinkError

    libraries = ['yaml']

    # write a temporary .c file to compile
    c_code = dedent("""
    #include <yaml.h>

    int main(int argc, char* argv[])
    {
        yaml_parser_t parser;
        parser = parser;  /* prevent warning */
        return 0;
    }
    """)
    tmp_dir = tempfile.mkdtemp(prefix = 'tmp_ruamel_yaml_')
    bin_file_name = os.path.join(tmp_dir, 'test_yaml')
    file_name = bin_file_name + '.c'
    with open(file_name, 'w') as fp:
        fp.write(c_code)

    # and try to compile it
    compiler = distutils.ccompiler.new_compiler()
    assert isinstance(compiler, distutils.ccompiler.CCompiler)
    distutils.sysconfig.customize_compiler(compiler)

    try:
        compiler.link_executable(
            compiler.compile([file_name]),
            bin_file_name,
            libraries=libraries,
        )
    except CompileError:
        print('libyaml compile error')
        ret_val = None
    except LinkError:
        print('libyaml link error')
        ret_val = None
    else:
        ret_val = [
            Extension(
                '_yaml',
                sources=['ext/_yaml.c'],
                libraries=libraries,
                ),
        ]
    shutil.rmtree(tmp_dir)
    return ret_val

This way you require no extra files in the distribution. Even if you cannot fail to compile based on the version number at compile time, you should be able to run the resulting program from the temporary directory and check the exit value and/or output.

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