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| 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 |
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