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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