[all-commits] [llvm/llvm-project] d0c8d5: Fix CMake configuration error when run with -Werro...

[AlexDenisov via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: d0c8d58527b07d8609961ea1f084d69ce0fcd3a8
      https://github.com/llvm/llvm-project/commit/d0c8d58527b07d8609961ea1f084d69ce0fcd3a8
  Author: Alex Denisov <alex at lowlevelbits.org>
  Date:   2020-10-10 (Sat, 10 Oct 2020)

  Changed paths:
    M llvm/cmake/modules/CheckAtomic.cmake

  Log Message:
  -----------
  Fix CMake configuration error when run with -Werror/-Wall

The following code doesn't compile

  uint64_t i = x.load(std::memory_order_relaxed);
  return 0;

when CMAKE_C_FLAGS set to -Werror -Wall, thus incorrectly
breaking the CMake configuration step:

  -- Looking for __atomic_load_8 in atomic
  -- Looking for __atomic_load_8 in atomic - not found
  CMake Error at cmake/modules/CheckAtomic.cmake:79 (message):
    Host compiler appears to require libatomic for 64-bit operations, but
    cannot find it.
  Call Stack (most recent call first):
    cmake/config-ix.cmake:360 (include)
    CMakeLists.txt:671 (include)