mirror of
git://git.musl-libc.org/musl
synced 2025-05-02 07:48:21 +00:00
b8dda24fe1
the motivation for this change is that the extra declaration (with or without visibility) using "struct _IO_FILE" instead of "FILE" seems to trigger a bug in gcc 3.x where it considers the types mismatched. however, this change also results in slightly better code and it is valid because (1) these three objects are constant, and (2) applying the & operator to any of them is invalid C, since they are not even specified to be objects. thus it does not matter if the application and libc see different addresses for them, as long as the (initial, unchanging) value is seen the same by both.
38 lines
1.3 KiB
C
38 lines
1.3 KiB
C
/* This file is only used if enabled in the build system, in which case it is
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* included automatically via command line options. It is not included
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* explicitly by any source files or other headers. Its purpose is to
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* override default visibilities to reduce the size and performance costs
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* of position-independent code. */
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#ifndef CRT
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#ifdef SHARED
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/* For shared libc.so, all symbols should be protected, but some toolchains
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* fail to support copy relocations for protected data, so exclude all
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* exported data symbols. */
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__attribute__((__visibility__("default")))
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extern int optind, opterr, optopt, optreset, __optreset, getdate_err, h_errno, daylight, __daylight, signgam, __signgam;
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__attribute__((__visibility__("default")))
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extern long timezone, __timezone;
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__attribute__((__visibility__("default")))
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extern char *optarg, **environ, **__environ, *tzname[2], *__tzname[2], *__progname, *__progname_full;
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#pragma GCC visibility push(protected)
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#elif defined(__PIC__)
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/* If building static libc.a as position-independent code, try to make
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* everything hidden except possibly-undefined weak references. */
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__attribute__((__visibility__("default")))
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extern void (*const __init_array_start)(), (*const __init_array_end)(),
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(*const __fini_array_start)(), (*const __fini_array_end)();
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#pragma GCC visibility push(hidden)
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#endif
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#endif
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