[PATCH] D127189: [clang][AIX] Add option to control quadword lock free atomics ABI on AIX

[Kai Luo via Phabricator via cfe-commits]

lkail created this revision.
lkail added reviewers: hubert.reinterpretcast, cebowleratibm, xingxue, PowerPC.
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We are supporting quadword lock free atomics on AIX. For the situation that users on AIX are using a libatomic that is lock-based for quadword types, we can't enable quadword lock free atomics by default on AIX in case user's new code and legacy code access the same shared atomic quadword variable, we can't guarentee atomicity. So we need an option to enable quadword lock free atomics on AIX, thus we can build a quadword lock-free libatomic for users to make the transition smooth.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D127189

Files:
  clang/include/clang/Basic/LangOptions.def
  clang/include/clang/Driver/Options.td
  clang/lib/Basic/Targets/PPC.cpp
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/lib/Frontend/CompilerInvocation.cpp
  clang/test/CodeGen/PowerPC/quadword-atomics.c
  clang/test/Driver/aix-quadword-atomics-abi.c
  clang/test/Driver/ppc-unsupported.c
  clang/test/Sema/atomic-ops.c

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