[all-commits] [llvm/llvm-project] 45ad34: [clang][WebAssembly] Imply -fno-threadsafe-static ...

[Sam Clegg via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 45ad3467b708618841869cb529a814001d2295f9
      https://github.com/llvm/llvm-project/commit/45ad3467b708618841869cb529a814001d2295f9
  Author: Sam Clegg <sbc at chromium.org>
  Date:   2022-01-31 (Mon, 31 Jan 2022)

  Changed paths:
    M clang/lib/Basic/Targets/WebAssembly.cpp
    M clang/test/CodeGenCXX/static-init-wasm.cpp

  Log Message:
  -----------
  [clang][WebAssembly] Imply -fno-threadsafe-static when threading is disabled

When we don't enable atomics we completely disabled threading in
which case there is no point in generating thread safe code for
static initialization.

This should always be safe because, in WebAssembly, it is not
possible to link object compiled without the atomics feature into a
mutli-threaded program.

See https://github.com/emscripten-core/emscripten/pull/16152

Differential Revision: https://reviews.llvm.org/D118571