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[libc++] Add _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS

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

Differential Revision: https://reviews.llvm.org/D26934

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@288690 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Shoaib Meenai
2016-12-05 19:40:12 +00:00
parent d59e3c7fed
commit c6d8e8a9cc
4 changed files with 43 additions and 9 deletions
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6
docs/UsingLibcxx.rst
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@@ -149,3 +149,9 @@ thread safety annotations.
This macro is used to enable -Wthread-safety annotations on libc++'s
``std::mutex`` and ``std::lock_guard``. By default these annotations are
disabled and must be manually enabled by the user.
**_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS**:
This macro is used to disable all visibility annotations inside libc++.
Defining this macro and then building libc++ with hidden visibility gives a
build of libc++ which does not export any symbols, which can be useful when
building statically for inclusion into another library.