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103dc4d4 LC |
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 |