New submission from RAW:
The header file pyconfig.h mishandles the _POSIX_C_SOURCE and _XOPEN_SOURCE
preprocessor macros.
For older versions of Python, the pyconfig.h header specifies:
#define _POSIX_C_SOURCE 200112L
and:
#define _XOPEN_SOURCE 600
For newer versions of Python, the pyconfig.h header specifies:
#define _POSIX_C_SOURCE 200809L
and:
#define _XOPEN_SOURCE 700
The Open Group has documentation about these symbols:
http://pubs.opengroup.org/onlinepubs/007904975/functions/xsh_chap02_02.html
In particular, the documentation states:
A POSIX-conforming application should ensure that the feature test macro
_POSIX_C_SOURCE is defined before inclusion of any header.
So, having a header file attempting to set _POSIX_C_SOURCE violates this
intention.
Yes, I am well aware that the Python documentation says to include Python.h
before any standard headers are included. However, this is still problematic.
In particular, it causes trouble for source code that wishes to include the
Python headers and wishes to use declarations that are made visible by setting
later values for _POSIX_C_SOURCE and _XOPEN_SOURCE.
I would suggest the pyconfig.h be updated to have something like this:
#if !defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE < 200112L
#ifdef _POSIX_C_SOURCE
#warning Python expects -D_POSIX_C_SOURCE=200112L or later
#undef _POSIX_C_SOURCE
#endif
#define _POSIX_C_SOURCE 200112L
#endif
and this:
#if !defined(_XOPEN_SOURCE) || _XOPEN_SOURCE < 600
#ifdef _XOPEN_SOURCE
#warning Python expects -D_XOPEN_SOURCE=600 or later
#undef _XOPEN_SOURCE
#endif
#define _XOPEN_SOURCE 600
#endif
--
components: Library (Lib)
messages: 181309
nosy: RAW
priority: normal
severity: normal
status: open
title: Mishandled _POSIX_C_SOURCE and _XOPEN_SOURCE in pyconfig.h
type: compile error
versions: Python 2.6, Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python
3.4, Python 3.5
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<http://bugs.python.org/issue17120>
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