[PATCH] D119209: Implement -mctor_dtor_return_this ABI option.

[Shu-Chun Weng via Phabricator via cfe-commits]

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This option forces constructors and non-deleting destructors to
return `this` pointer.

This is similar to ARM32, Apple ARM64, or Fuchsia C++ ABI, but can be           
applied to any target triple.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D119209

Files:
  clang/include/clang/Basic/CodeGenOptions.def
  clang/include/clang/Driver/Options.td
  clang/lib/CodeGen/CGCXXABI.h
  clang/lib/CodeGen/ItaniumCXXABI.cpp
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/test/CodeGenCXX/constructor-destructor-return-this.cpp

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