[all-commits] [llvm/llvm-project] 987b49: [PPC] Undefine __ppc64__ to match GCC

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 987b49395c604c794bee4439af4d3a47b4b58276
      https://github.com/llvm/llvm-project/commit/987b49395c604c794bee4439af4d3a47b4b58276
  Author: Fangrui Song <i at maskray.me>
  Date:   2022-11-22 (Tue, 22 Nov 2022)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/lib/Basic/Targets/PPC.cpp
    M clang/test/Preprocessor/init-ppc64.c

  Log Message:
  -----------
  [PPC] Undefine __ppc64__ to match GCC

GCC only defines `__ppc64__` for darwin while the darwin support has been
removed from llvm-project. The existence of `__ppc64__` makes some software
think we are compiling for big-endian PowerPC Mac; also it lures users to write
code which is not portable to GCC.

It is straightforward if a distro wants to keep the macro: add
`-D__ppc64__=1` to a Clang configuration file.

Reviewed By: thesamesam, nemanjai

Differential Revision: https://reviews.llvm.org/D137511