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Viewing changes to config/link-warning.h

  • Committer: Jay Pipes
  • Date: 2009-02-04 15:44:25 UTC
  • mfrom: (829 drizzle)
  • mto: This revision was merged to the branch mainline in revision 830.
  • Revision ID: jpipes@serialcoder-20090204154425-th8xfk2ujz2y8xwg
Merge with trunk

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config/link-warning.h
 
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/* GL_LINK_WARNING("literal string") arranges to emit the literal string as
 
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   a linker warning on most glibc systems.
 
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   We use a linker warning rather than a preprocessor warning, because
 
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   #warning cannot be used inside macros.  */
 
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#ifndef GL_LINK_WARNING
 
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  /* This works on platforms with GNU ld and ELF object format.
 
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     Testing __GLIBC__ is sufficient for asserting that GNU ld is in use.
 
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     Testing __ELF__ guarantees the ELF object format.
 
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     Testing __GNUC__ is necessary for the compound expression syntax.  */
 
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# if defined __GLIBC__ && defined __ELF__ && defined __GNUC__
 
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#  define GL_LINK_WARNING(message) \
 
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     GL_LINK_WARNING1 (__FILE__, __LINE__, message)
 
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#  define GL_LINK_WARNING1(file, line, message) \
 
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     GL_LINK_WARNING2 (file, line, message)  /* macroexpand file and line */
 
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#  define GL_LINK_WARNING2(file, line, message) \
 
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     GL_LINK_WARNING3 (file ":" #line ": warning: " message)
 
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#  define GL_LINK_WARNING3(message) \
 
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     ({ static const char warning[sizeof (message)]             \
 
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          __attribute__ ((__unused__,                           \
 
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                          __section__ (".gnu.warning"),         \
 
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                          __aligned__ (1)))                     \
 
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          = message "\n";                                       \
 
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        (void)0;                                                \
 
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     })
 
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# else
 
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#  define GL_LINK_WARNING(message) ((void) 0)
 
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# endif
 
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#endif