[all-commits] [llvm/llvm-project] 71ab44: [Clang] Add "extend lifetime" flags and release no...

[Wolfgang Pieb via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 71ab44a8193c56e4ef9aede4d9bac8e14760c6c6
      https://github.com/llvm/llvm-project/commit/71ab44a8193c56e4ef9aede4d9bac8e14760c6c6
  Author: Wolfgang Pieb <wolfgang.pieb at sony.com>
  Date:   2025-01-28 (Tue, 28 Jan 2025)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/Basic/CodeGenOptions.def
    M clang/include/clang/Basic/CodeGenOptions.h
    M clang/include/clang/Driver/Options.td
    M clang/lib/Driver/ToolChains/Clang.cpp
    A clang/test/Driver/extend-variable-liveness.c

  Log Message:
  -----------
  [Clang] Add "extend lifetime" flags and release note (#110000)

Following the commit that added the fake use intrinsic to LLVM, this patch
adds a pair of flags for the clang frontend that emit fake use intrinsics,
for the purpose of extending the lifetime of variables (either all source
variables, or just the `this` pointer). This patch does not implement the
fake use intrinsic emission of the flags themselves, it simply adds the flags,
the corresponding release note, and the attachment of the `has_fake_uses`
attribute to affected functions; the remaining functionality appears in the
next patch.

Co-authored-by: Stephen Tozer <stephen.tozer at sony.com>



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