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[libunwind] Add _LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS 

It's useful to be able to disable visibility annotations entirely; for
example, if we're building libunwind static to include in another library,
and we don't want any libunwind functions getting exported out of that
library.

https://reviews.llvm.org/D34637
Patch from Thomas Anderson <thomasanderson@chromium.org>!

llvm-svn: 306442
This commit is contained in:
Nico Weber 2017-06-27 18:37:06 +00:00
parent 836d786e86
commit 205519b97e
1 changed files with 8 additions and 3 deletions
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11
libunwind/src/config.h
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@ -44,9 +44,14 @@
#endif
#endif
// FIXME: these macros are not correct for COFF targets
#define _LIBUNWIND_EXPORT __attribute__((visibility("default")))
#define _LIBUNWIND_HIDDEN __attribute__((visibility("hidden")))
#if defined(_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS)
#define _LIBUNWIND_EXPORT
#define _LIBUNWIND_HIDDEN
#else
// FIXME: these macros are not correct for COFF targets
#define _LIBUNWIND_EXPORT __attribute__((visibility("default")))
#define _LIBUNWIND_HIDDEN __attribute__((visibility("hidden")))
#endif
#if (defined(__APPLE__) && defined(__arm__)) || defined(__USING_SJLJ_EXCEPTIONS__)
#define _LIBUNWIND_BUILD_SJLJ_APIS