[all-commits] [llvm/llvm-project] b13fc7: [OpenCL] __cpp_threadsafe_static_init is by defaul...

[Justas Janickas via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b13fc7311eabca27b3baea99b7be6edef0213406
      https://github.com/llvm/llvm-project/commit/b13fc7311eabca27b3baea99b7be6edef0213406
  Author: Justas Janickas <Justas.Janickas at arm.com>
  Date:   2021-08-02 (Mon, 02 Aug 2021)

  Changed paths:
    M clang/lib/Driver/ToolChains/Clang.cpp
    A clang/test/Driver/threadsafe-statics.clcpp

  Log Message:
  -----------
  [OpenCL] __cpp_threadsafe_static_init is by default undefined in OpenCL mode.

Definition of `__cpp_threadsafe_static_init` macro is controlled by
language option Opts.ThreadsafeStatics. This patch sets language
option to false by default in OpenCL mode, resulting in macro
`__cpp_threadsafe_static_init` being undefined. Default value can be
overridden using command line option -fthreadsafe-statics.

Change is supposed to address portability because not all OpenCL
vendors support thread safe implementation of static initialization.

Fixes llvm.org/PR48012

Differential Revision: https://reviews.llvm.org/D107163