[all-commits] [llvm/llvm-project] 641910: [LifetimeSafety] Add language option for experimen...

[Utkarsh Saxena via All-commits]

  Branch: refs/heads/release/21.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 6419104d187807eafc61ae7dfda55b4101e8fd6f
      https://github.com/llvm/llvm-project/commit/6419104d187807eafc61ae7dfda55b4101e8fd6f
  Author: Utkarsh Saxena <usx at google.com>
  Date:   2025-08-05 (Tue, 05 Aug 2025)

  Changed paths:
    M clang/include/clang/Basic/LangOptions.def
    M clang/include/clang/Driver/Options.td
    M clang/lib/Sema/AnalysisBasedWarnings.cpp
    M clang/test/Sema/warn-lifetime-safety-dataflow.cpp

  Log Message:
  -----------
  [LifetimeSafety] Add language option for experimental lifetime safety (#149592)

Add a language option flag for experimental lifetime safety analysis in C++.

This change provides a language option to control the experimental lifetime safety analysis feature, making it more explicit and easier to enable/disable. Previously, the feature was controlled indirectly through a diagnostic warning flag, which we do not want to accidentally enable with `-Weverything` (atm)!

- Added a new language option `EnableLifetimeSafety` in `LangOptions.def` for experimental lifetime safety analysis in C++
- Added corresponding driver options `-fexperimental-lifetime-safety` and `-fno-experimental-lifetime-safety` in `Options.td`
- Modified `AnalysisBasedWarnings.cpp` to use the new language option flag instead of checking if a specific diagnostic is ignored
- Updated a test case to use the new flag instead of relying on the warning flag alone

(cherry picked from commit 0d0478903474b2e53c874427e3d6eb2ed7567e50)



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