[all-commits] [llvm/llvm-project] 28f2d0: [AIX] Revert `#pragma mc_func` check (#102919)

[Qiongsi Wu via All-commits]

  Branch: refs/heads/release/19.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 28f2d04b3ca36faffe997fa86833e5ed83699272
      https://github.com/llvm/llvm-project/commit/28f2d04b3ca36faffe997fa86833e5ed83699272
  Author: Qiongsi Wu <274595+qiongsiwu at users.noreply.github.com>
  Date:   2024-08-13 (Tue, 13 Aug 2024)

  Changed paths:
    M clang/include/clang/Basic/DiagnosticParseKinds.td
    M clang/include/clang/Driver/Options.td
    M clang/include/clang/Lex/PreprocessorOptions.h
    M clang/include/clang/Parse/Parser.h
    M clang/lib/Driver/ToolChains/AIX.cpp
    M clang/lib/Parse/ParsePragma.cpp
    R clang/test/Preprocessor/pragma_mc_func.c

  Log Message:
  -----------
  [AIX] Revert `#pragma mc_func` check (#102919)

https://github.com/llvm/llvm-project/pull/99888 added a specific
diagnostic for `#pragma mc_func` on AIX. There are some disagreements
on:

1. If the check should be on by default. Leaving the check off by
default is dangerous, since it is difficult to be aware of such a check.
Turning it on by default at the moment causes build failures on AIX. See
https://github.com/llvm/llvm-project/pull/101336 for more details.
2. If the check can be made more general. See
https://github.com/llvm/llvm-project/pull/101336#issuecomment-2269283906.

This PR reverts this check from `main` so we can flush out these
disagreements.

(cherry picked from commit 123b6fcc70af17d81c903b839ffb55afc9a9728f)



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