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#if defined(__GNUC__)
#   if (__GNUC__ < 4)
#      error "GCC3 with backported visibility patch is known to miscompile Qt"
#   endif
__attribute((visibility("default"))) void blah();
#elif defined(__SUNPRO_CC)
#   if (__SUNPRO_CC < 0x0550)
#      error "SunStudio 8 or later is required for ELF visibility"
#   endif
__global void blah();
#else
#   error "GCC4+ or SunStudio 8+ are required to support ELF visibility"
#endif