FM / c

/usr/include/boost/predef/library/c

Name	Size	Mode	Actions
cloudabi.h	1314	0644	edit dl rm
gnu.h	1506	0644	edit dl rm
uc.h	1127	0644	edit dl rm
vms.h	1057	0644	edit dl rm
zos.h	1407	0644	edit dl rm
_prefix.h	319	0644	edit dl rm

Edit: /usr/include/boost/predef/library/c/gnu.h (1506B)

/*
Copyright Rene Rivera 2008-2015
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
*/

#ifndef BOOST_PREDEF_LIBRARY_C_GNU_H
#define BOOST_PREDEF_LIBRARY_C_GNU_H

#include <boost/predef/version_number.h>
#include <boost/predef/make.h>

#include <boost/predef/library/c/_prefix.h>

#if defined(__STDC__)
#include <stddef.h>
#elif defined(__cplusplus)
#include <cstddef>
#endif

/* tag::reference[]
= `BOOST_LIB_C_GNU`

http://en.wikipedia.org/wiki/Glibc[GNU glibc] Standard C library.
Version number available as major, and minor.

[options="header"]
|===
| {predef_symbol} | {predef_version}

| `+__GLIBC__+` | {predef_detection}
| `+__GNU_LIBRARY__+` | {predef_detection}

#define BOOST_LIB_C_GNU BOOST_VERSION_NUMBER_NOT_AVAILABLE

#if defined(__GLIBC__) || defined(__GNU_LIBRARY__)
#   undef BOOST_LIB_C_GNU
#   if defined(__GLIBC__)
#       define BOOST_LIB_C_GNU \
            BOOST_VERSION_NUMBER(__GLIBC__,__GLIBC_MINOR__,0)
#   else
#       define BOOST_LIB_C_GNU \
            BOOST_VERSION_NUMBER(__GNU_LIBRARY__,__GNU_LIBRARY_MINOR__,0)
#   endif
#endif

#if BOOST_LIB_C_GNU
#   define BOOST_LIB_C_GNU_AVAILABLE
#endif

#define BOOST_LIB_C_GNU_NAME "GNU"

#endif

#include <boost/predef/detail/test.h>
BOOST_PREDEF_DECLARE_TEST(BOOST_LIB_C_GNU,BOOST_LIB_C_GNU_NAME)

cmd: