Eric Fiselier 49e2967f27 [libc++] Fix and document visibility attributes for Clang, GCC and Windows. ...

Summary:
This patch fixes a number of problems with the visibility macros across GCC (on Unix) and Windows (DLL import/export semantics). All of the visibility macros are now documented under `DesignDocs/VisibilityMacros.rst`. Now I'll no longer forget the subtleties of each!

This patch adds two new visibility macros:

* `_LIBCPP_ENUM_VIS` for controlling the typeinfo of enum types. Only Clang supports this.
* `_LIBCPP_EXTERN_TEMPLATE_TYPE_VIS` for redefining visibility on explicit instantiation declarations. Clang and Windows require this.

After applying this patch GCC only emits one -Wattribute warning opposed to 30+.


Reviewers: mclow.lists, EricWF

Subscribers: beanz, mgorny, cfe-commits

Differential Revision: https://reviews.llvm.org/D24602

llvm-svn: 281673

2016-09-15 22:27:07 +00:00

..

ABIVersioning.rst

Use __config_site when building libc++. Also cleanup ABI versioning doc

2015-10-14 00:22:05 +00:00

CapturingConfigInfo.rst

…

VisibilityMacros.rst

[libc++] Fix and document visibility attributes for Clang, GCC and Windows.

2016-09-15 22:27:07 +00:00