[all-commits] [llvm/llvm-project] 742fa8: [ARM] Introduce -mtp=auto and make it the default ...

[Austin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 742fa8ac67796198dde99e18cdadeaf9b96c2f88
      https://github.com/llvm/llvm-project/commit/742fa8ac67796198dde99e18cdadeaf9b96c2f88
  Author: Austin <zhenhangwang at huawei.com>
  Date:   2025-03-03 (Mon, 03 Mar 2025)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/Driver/Options.td
    M clang/lib/Driver/ToolChains/Arch/ARM.cpp
    M clang/test/Driver/arm-thread-pointer.c

  Log Message:
  -----------
  [ARM] Introduce -mtp=auto and make it the default (#128901)

This adds a new value auto to the possible values of the existing -mtp=
clang option which controls how the thread pointer is found. auto means
the same as soft if the target architecture doesn't support a hardware
thread pointer at all; otherwise it means the same as cp15.

This behavior is the default in gcc version 4.1.0 and later. The new
auto option is therefore also the default in clang, so this change
aligns clang with gcc.

Fixes #123864.



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