[issue5404] Cross-compiling Python

[awilfox]

awilfox added the comment:

Bootstrapping a Linux environment based on musl libc from glibc host requires cross-compilation to the same architecture (for example, configure is --build=i686-pc-linux-gnu --host=i686-pc-linux-musl).

The Python core will build and link fine in this configuration; unfortunately, every module in sharedmods fails to link if the ABI is different, as Lib/distutils/command/build_ext.py:732 uses sys.abiflags and the native Python is used.  For example, my distribution ships with no ABI flags (libpython3.4.so), but if I use the default enabled PyMalloc (libpython3.4m.so), I will see:

/usr/libexec/gcc/i686-foxkit-linux-musl/ld: cannot find -lpython3.4
collect2: error: ld returned 1 exit status

during linking of all sharedmods.

As I am relatively unfamiliar with distutils' internals I am quite unsure how to proceed to fix this, but am willing test any patches.  For now, I just disable/enable PyMalloc and wide Unicode to match the ABI of the host computer.

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components: +Cross-Build -Build
nosy: +Alex.Willmer, awilfox
versions: +Python 3.4 -Python 3.2

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<http://bugs.python.org/issue5404>
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