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comparison link-warning.h @ 272:d5392bb5da3c 2.5
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author | lost |
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date | Sun, 16 Aug 2009 17:16:49 +0000 |
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271:3b793ba7a6c6 | 272:d5392bb5da3c |
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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 |