[issue22699] Module source files not found when cross-compiling

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

Trimmed a bit from setup.py here, but I think this is the cause:

    def build_extensions(self):
        self.srcdir = sysconfig.get_config_var('srcdir')
        self.srcdir = os.path.abspath(self.srcdir)

        [SNIP]

        # Fix up the autodetected modules, prefixing all the source files
        # with Modules/.
        moddirlist = [os.path.join(self.srcdir, 'Modules')]

In my build, I've set PYTHON_FOR_BUILD=python3.8, and the contents of moddirlist is '/usr/lib/python3.8/config-3.8-x86_64-linux-gnu/Modules'. So it's picking the wrong source directory.

I replaced the second line of the function above with:
    self.srcdir = os.path.dirname(os.path.abspath(__file__))

Which made things a little better (I can launch my build now), but all the -I/usr/* options need to be replaced as well or there are no dynamically loaded modules.

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title: cross-compilation of Python3.4 -> Module source files not found when cross-compiling

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<https://bugs.python.org/issue22699>
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