[all-commits] [llvm/llvm-project] 30c05f: [runtimes] Properly handle the sysroot/triple/gcc-...

[Louis Dionne via All-commits]

  Branch: refs/heads/release/13.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 30c05f43b662ae0365715449a05a5429ed3562d9
      https://github.com/llvm/llvm-project/commit/30c05f43b662ae0365715449a05a5429ed3562d9
  Author: Louis Dionne <ldionne.2 at gmail.com>
  Date:   2021-10-21 (Thu, 21 Oct 2021)

  Changed paths:
    M libcxx/CMakeLists.txt
    M libcxxabi/CMakeLists.txt
    M libunwind/CMakeLists.txt

  Log Message:
  -----------
  [runtimes] Properly handle the sysroot/triple/gcc-toolchain

In 395271a, I simplified how we handled the target triple for the
runtimes. However, in doing so, we stopped considering the default
in CMAKE_CXX_COMPILER_TARGET, so we'd use the LLVM_DEFAULT_TARGET_TRIPLE
(which is the host triple) even if CMAKE_CXX_COMPILER_TARGET was specified.
This commit fixes that problem and also refactors the code so that it's
easy to see what the default value is.

The fact that nobody seems to have been broken by this makes me think
that perhaps nobody is using CMAKE_CXX_COMPILER_TARGET to specify the
triple -- but it should still work.

Differential Revision: https://reviews.llvm.org/D111672

(cherry picked from commit 72117f2ffeb6a096a808c34ec7ebee122c2d2e21)