[all-commits] [llvm/llvm-project] c505ce: Deprecate -fheinous-gnu-extensions; introduce a ne...

[Aaron Ballman via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c505ce9df7006edabf402a73782121c44b697289
      https://github.com/llvm/llvm-project/commit/c505ce9df7006edabf402a73782121c44b697289
  Author: Aaron Ballman <aaron at aaronballman.com>
  Date:   2024-08-23 (Fri, 23 Aug 2024)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/Basic/DiagnosticSemaKinds.td
    M clang/include/clang/Basic/LangOptions.def
    M clang/include/clang/Driver/Options.td
    M clang/lib/Sema/SemaStmtAsm.cpp
    M clang/test/Analysis/asm.cpp
    M clang/test/Analysis/cfg.c
    M clang/test/Analysis/cfg.cpp
    A clang/test/Driver/heinous-gnu-extensions.c
    M clang/test/Misc/warning-flags.c
    M clang/test/Sema/heinous-extensions-off.c
    M clang/test/Sema/heinous-extensions-on.c

  Log Message:
  -----------
  Deprecate -fheinous-gnu-extensions; introduce a new warning flag (#105821)

The new warning flag is `-Winvalid-gnu-asm-cast`, which is enabled by
default and is a downgradable diagnostic which defaults to an error.

This language dialect flag only controls whether a single diagnostic is
emitted as a warning or as an error, and has never been expanded to
include other behaviors. Given the rather perjorative name, it's better
for us to just expose a diagnostic flag for the one warning in question
and let the user elect to do `-Wno-error=` if they need to.

There's not a lot of use of the language dialect flag in the wild, but
there is some use of it. For the time being, this aliases the -f flag to
`-Wno-error=invalid-gnu-asm-cast`, but the -f flag can eventually be
removed.



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