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