New submission from Takashi Matsuzawa:
I have been debugging for a couple of days to now why my extension module build
fails with my Yocto 2.0 cross-build environment.
(python version is 2.7, host is x86_64 and target is qemux86).
The symptom is that LD flags -L and -lpython27 are not being passed cross gcc
and linker fails.
The direct cause of this is that lib/distutils/sysconfig.py not picking up
Py_ENABLE_SHARED value (it should be 1 since I am linking against shared
In lib/distutils/sysconfig.py:parse_config_h(), the code is reading the file
pointer line by line, and only doing string match against #define and #under.
No other type of lines are meaningful to this code.
However, the pyconfig.h I have is like this:
* Copyright (C) 2005-2011 by Wind River Systems, Inc.
#else /* _MIPS_SIM is not defined */
So, parse_config_h() fails to get anything from there.
In particular, it fails to get the following in pyconfig-32.h and I fail to
build extension module using this configuration of python.
#define Py_ENABLE_SHARED 1
I have looked into the master branch, but the parse_config_h() code is the same
as what I have on my PC.
I am not sure which of the below is true
1) pyconfig.h should be flat, no #ifdef's, so that parse_config_h() does its
2) parse_config_h() should be flexible to allow ordinal header file syntax
including #ifdef's and #includes (or pyconfig.h should be preprocessed before
it is read by parse_config_h()).
nosy: Alex.Willmer, tmatsuzawa
title: lib/distutils/sysconfig.py fails to pick up Py_ENABLE_SHARED value
type: compile error
versions: Python 2.7
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