tree b5e9b8549f17e0ebd125857d04c081326cb97cd8
parent 9e2169efef5bd447dac9620c9c76fe4020e9b7e8
author Shoaib Meenai <smeenai@fb.com> 1488340557 +0000
committer Shoaib Meenai <smeenai@fb.com> 1488340557 +0000

[libc++abi] Clean up visibility

Use the libc++abi visibility macros instead of pragmas or using
visibility attributes directly. Clean up redundant attributes on
definitions (where the declarations already have visibility attributes
applied, from either libc++ or libc++abi headers).

Introduce _LIBCXXABI_WEAK as a drive-by cleanup, which matches the
semantics of _LIBCPP_WEAK.

No functional change. Tested by building on Linux before and after this
change and verifying that the list of exported symbols is identical.

Differential Revision: https://reviews.llvm.org/D26949

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@296576 91177308-0d34-0410-b5e6-96231b3b80d8