[all-commits] [llvm/llvm-project] 671c0a: [Clang][Driver] Fix compiler-rt library directory ...

[tyan0 via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 671c0a275a1f304f22855fabb299090233fdbd54
      https://github.com/llvm/llvm-project/commit/671c0a275a1f304f22855fabb299090233fdbd54
  Author: tyan0 <takashi.yano at nifty.ne.jp>
  Date:   2026-07-17 (Fri, 17 Jul 2026)

  Changed paths:
    M clang/lib/Driver/ToolChain.cpp
    A clang/test/Driver/Inputs/resource_dir/lib/cygwin/libclang_rt.builtins-x86_64.a
    A clang/test/Driver/Inputs/resource_dir_with_per_target_subdir/lib/x86_64-pc-windows-cygnus/libclang_rt.builtins.a
    A clang/test/Driver/cygwin-print-file-name.c

  Log Message:
  -----------
  [Clang][Driver] Fix compiler-rt library directory for cygwin (#208925)

If compiler-rt is built with `LLVM_ENABLE_PER_TARGET_RUNTIME_DIR=OFF`,
its search directory is incorrect.

Specifically, `ToolChain::getOSLibName()` returns `windows` instead of
`cygwin` in a Cygwin environment, due to falling back to getOS(). This
results in a link error against compiler-rt.

This patch makes `getOSLibName()` return `cygwin`, ensuring that
compiler-rt is linked correctly.

---------

Signed-off-by: Takashi Yano <takashi.yano at nifty.ne.jp>



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