[all-commits] [llvm/llvm-project] f5c1d4: [libc++] Try to fix Chromium's build

[Louis Dionne via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: f5c1d4409e013f805a151bb2089cfa030f7eb892
      https://github.com/llvm/llvm-project/commit/f5c1d4409e013f805a151bb2089cfa030f7eb892
  Author: Louis Dionne <ldionne at apple.com>
  Date:   2020-04-02 (Thu, 02 Apr 2020)

  Changed paths:
    M libcxx/cmake/Modules/HandleLibCXXABI.cmake

  Log Message:
  -----------
  [libc++] Try to fix Chromium's build

Chromium's build sets LIBCXX_CXX_ABI_SYSTEM explicitly when building
libc++, which was broken by 61e89737c5da (which stopped listening to
that option). As a workaround, this commit uses the system libc++abi
when LIBCXX_CXX_ABI_SYSTEM is used.

However, we will need to work with Chromium to standardize their build
of libc++, because LIBCXX_CXX_ABI_SYSTEM is not a public facing build
configuration for libc++, and has never been AFAICT.