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/* 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