-/* A C macro for emitting link time warnings.
- Copyright (C) 1995, 1997, 2000, 2002-2003, 2007, 2009-2011 Free Software
- Foundation, Inc.
-
- This program 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 of the License, or
- (at your option) any later version.
-
- This program 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 program. If not, see <http://www.gnu.org/licenses/>. */
-
-#if @HAVE_FEATURES_H@
-# include <features.h> /* for __GLIBC__, __UCLIBC__ */
-#endif
-
-/* 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 __UCLIBC__) && 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