src/internal/vis.h

   1 /* This file is only used if enabled in the build system, in which case it is
   2  * included automatically via command line options. It is not included
   3  * explicitly by any source files or other headers. Its purpose is to
   4  * override default visibilities to reduce the size and performance costs
   5  * of position-independent code. */
   6
   7 #if !defined(CRT) && !defined(__ASSEMBLER__)
   8
   9 /* Conceptually, all symbols should be protected, but some toolchains
  10  * fail to support copy relocations for protected data, so exclude all
  11  * exported data symbols. */
  12
  13 __attribute__((__visibility__("default")))
  14 extern struct _IO_FILE *const stdin, *const stdout, *const stderr;
  15
  16 __attribute__((__visibility__("default")))
  17 extern int optind, opterr, optopt, optreset, __optreset, getdate_err, h_errno, daylight, __daylight, signgam, __signgam;
  18
  19 __attribute__((__visibility__("default")))
  20 extern long timezone, __timezone;
  21
  22 __attribute__((__visibility__("default")))
  23 extern char *optarg, **environ, **__environ, *tzname[2], *__tzname[2], *__progname, *__progname_full;
  24
  25 #pragma GCC visibility push(protected)
  26
  27 #endif