Issue 1017450: including Python.h redefines _POSIX_C_SOURCE (original) (raw)

Issue1017450

Created on 2004-08-27 08:43 by jhellan, last changed 2022-04-11 14:56 by admin. This issue is now closed.

Messages (3)
msg22234 - (view)	Author: Jon Kåre Hellan (jhellan)	Date: 2004-08-27 08:43
Consider this program: #include <limits.h> #include <Python.h> int main (int arg, char **argv) { return 0; } We compile it like this cc -Wall -I/usr/include/python2.3 -c aa.c And get In file included from /usr/include/python2.3/Python.h:8, from aa.c:3: /usr/include/python2.3/pyconfig.h:853:1: warning: "_POSIX_C_SOURCE" redefined In file included from /usr/include/limits.h:26, from /usr/lib/gcc-lib/i486-linux/3.3.4/include/limits.h:122, from /usr/lib/gcc-lib/i486-linux/3.3.4/include/syslimits.h:7, from /usr/lib/gcc-lib/i486-linux/3.3.4/include/limits.h:11, from aa.c:2: /usr/include/features.h:171:1: warning: this is the location of the previous definition Python.h has redefind a symbol which got defined by including limits.h. This is unfriendly to programs which embed Python. I suspect that there are definitions in pyconfig.h which are only relevant when building the Python distribution. Such definitions should not be exposed to embedders or builders of 3rd party modules. I can make the warning go away by including Python.h first. But my application has its own config.h - strange that Python's has to go in front of it.
msg22235 - (view)	Author: Jon Kåre Hellan (jhellan)	Date: 2004-08-27 08:56
Logged In: YES user_id=268898 Sorry about the duplicate. That was my browser's "back" button. Platform is Debian sid (soon to be sarge), and Python version is 2.3.
msg22236 - (view)	Author: Martin v. Löwis (loewis) *	Date: 2004-09-04 16:52
Logged In: YES user_id=21627 Your program is in error - it must not include limits.h before including Python.h, see http://docs.python.org/api/includes.html The defines in Python.h *can* affect the code in the extension module, e.g. they might affect the size of off_t. Extensions which don't follow this rule may crash.