commit 244334750df13bd76a8485c616f4d2a4c1f0dae3
author Louis Dionne <ldionne@apple.com> Mon Mar 25 14:56:29 2019 +0000
committer Louis Dionne <ldionne@apple.com> Mon Mar 25 14:56:29 2019 +0000
tree 7d3a571a6db2a9ca9d53e4007706739e40381b0f
parent d36fc70220ed17b325425beae36550211309756e

[libc++][CMake] Allow merging libc++abi.a into libc++ even on Apple platforms

Summary:
I can't see a good reason to disallow this, even though it isn't the
standard way we build libc++ for Apple platforms.

Making this work on Apple platforms requires using different flags for
--whole-archive and removing the -D flag when running `ar` to merge
archives because that flag isn't supported by the `ar` shipped on Apple
platforms. This shouldn't be an issue since the -D option appears to be
enabled by default in GNU `ar`.

Reviewers: phosek, EricWF, serge-sans-paille

Subscribers: mgorny, christof, jkorous, dexonsmith, libcxx-commits

Differential Revision: https://reviews.llvm.org/D59513

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@356903 91177308-0d34-0410-b5e6-96231b3b80d8