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"))) 14extern struct _IO_FILE *const stdin, *const stdout, *const stderr; 15 16__attribute__((__visibility__("default"))) 17extern int optind, opterr, optopt, optreset, __optreset, getdate_err, h_errno, daylight, __daylight, signgam, __signgam; 18 19__attribute__((__visibility__("default"))) 20extern long timezone, __timezone; 21 22__attribute__((__visibility__("default"))) 23extern char *optarg, **environ, **__environ, *tzname[2], *__tzname[2], *__progname, *__progname_full; 24 25#pragma GCC visibility push(protected) 26 27#endif 28