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Annotation of embedaddon/libiconv/build-aux/link-warning.h, revision 1.1.1.1

1.1       misho       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