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dft_tools/doc/reference/utilities/python_include_mess.rst
tayral edd1ff4529 Restructuring documentation.
A first general restructuration of the doc according to the pattern [tour|tutorial|reference].
In the reference part, objects are documented per topic.
In each topic, [definition|c++|python|hdf5] (not yet implemented)
2014-10-18 12:21:08 +01:00

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Python include warnings
===============================
Very often compile warnings of Python can be seen, something like ::
/usr/local/install/python-2.7.5/include/python2.7/pyconfig.h:1173:0: warning: "_POSIX_C_SOURCE" redefined [enabled by default]
#define _POSIX_C_SOURCE 200112L
^
In file included from /usr/local/install/gcc-4.8.1/include/c++/4.8.1/x86_64-unknown-linux-gnu/bits/os_defines.h:39:0,
......
/usr/include/features.h:162:0: note: this is the location of the previous definition
# define _POSIX_C_SOURCE 200809L
...
#define _XOPEN_SOURCE 600
It is due to the fact that Python.h must be included
before some other headers (cf python documentation).
Solutions:
#. include first some triqs library, like arrays.hpp, gfs.hpp, etc...
#. include first <utility/first_include.hpp>
that conditionally includes python if python is to be supported.
(used by all triqs libs, hence the first point).