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/*
* Copyright (C) 2007, 2009 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
/* GL_LINK_WARNING("literal string") arranges to emit the literal string as
a linker warning on most glibc systems.
We use a linker warning rather than a preprocessor warning, because
#warning cannot be used inside macros. */
#ifndef GL_LINK_WARNING
/* This works on platforms with GNU ld and ELF object format.
Testing __GLIBC__ is sufficient for asserting that GNU ld is in use.
Testing __ELF__ guarantees the ELF object format.
Testing __GNUC__ is necessary for the compound expression syntax. */
# if defined __GLIBC__ && defined __ELF__ && defined __GNUC__
# define GL_LINK_WARNING(message) \
GL_LINK_WARNING1 (__FILE__, __LINE__, message)
# define GL_LINK_WARNING1(file, line, message) \
GL_LINK_WARNING2 (file, line, message) /* macroexpand file and line */
# define GL_LINK_WARNING2(file, line, message) \
GL_LINK_WARNING3 (file ":" #line ": warning: " message)
# define GL_LINK_WARNING3(message) \
({ static const char warning[sizeof (message)] \
__attribute__ ((__unused__, \
__section__ (".gnu.warning"), \
__aligned__ (1))) \
= message "\n"; \
(void)0; \
})
# else
# define GL_LINK_WARNING(message) ((void) 0)
# endif
#endif
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