[all-commits] [llvm/llvm-project] 2ef7cb: [clang] Add deprecation warning for `-Ofast` drive...

[Vlad Serebrennikov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2ef7cbf71c98246d6f3a9c63dea75b76c7b5e928
      https://github.com/llvm/llvm-project/commit/2ef7cbf71c98246d6f3a9c63dea75b76c7b5e928
  Author: Vlad Serebrennikov <serebrennikov.vladislav at gmail.com>
  Date:   2024-07-18 (Thu, 18 Jul 2024)

  Changed paths:
    M clang/docs/CommandGuide/clang.rst
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/Basic/DiagnosticDriverKinds.td
    M clang/include/clang/Basic/DiagnosticGroups.td
    M clang/include/clang/Driver/Options.td
    M clang/lib/Driver/ToolChains/Clang.cpp
    M clang/test/Driver/Ofast.c

  Log Message:
  -----------
  [clang] Add deprecation warning for `-Ofast` driver option (#98736)

This patch implements consensus on the corresponding RFC documented
here: https://discourse.llvm.org/t/rfc-deprecate-ofast/78687/72
Specifically, I added a deprecation warning for `-Ofast`, that suggests
to use `-O3` or `-O3` with `-ffast-math`, and a new diagnostic group for
aforementioned warning.
Deprecation period is going to be lengthy, so I hope this PR can be
merged in time for Clang 19.



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