1/* GL_LINK_WARNING("literal string") arranges to emit the literal string as
2   a linker warning on most glibc systems.
3   We use a linker warning rather than a preprocessor warning, because
4   #warning cannot be used inside macros.  */
5#ifndef GL_LINK_WARNING
6  /* This works on platforms with GNU ld and ELF object format.
7     Testing __GLIBC__ is sufficient for asserting that GNU ld is in use.
8     Testing __ELF__ guarantees the ELF object format.
9     Testing __GNUC__ is necessary for the compound expression syntax.  */
10# if defined __GLIBC__ && defined __ELF__ && defined __GNUC__
11#  define GL_LINK_WARNING(message) \
12     GL_LINK_WARNING1 (__FILE__, __LINE__, message)
13#  define GL_LINK_WARNING1(file, line, message) \
14     GL_LINK_WARNING2 (file, line, message)  /* macroexpand file and line */
15#  define GL_LINK_WARNING2(file, line, message) \
16     GL_LINK_WARNING3 (file ":" #line ": warning: " message)
17#  define GL_LINK_WARNING3(message) \
18     ({ static const char warning[sizeof (message)]		\
19          __attribute__ ((__unused__,				\
20                          __section__ (".gnu.warning"),		\
21                          __aligned__ (1)))			\
22          = message "\n";					\
23        (void)0;						\
24     })
25# else
26#  define GL_LINK_WARNING(message) ((void) 0)
27# endif
28#endif
29