[all-commits] [llvm/llvm-project] 78820c: [Clang] Enable multilib library support for Linux/...

[Joseph Huber via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 78820cb91605693b7d768be4ebc8b66181d3e9c3
      https://github.com/llvm/llvm-project/commit/78820cb91605693b7d768be4ebc8b66181d3e9c3
  Author: Joseph Huber <huberjn at outlook.com>
  Date:   2026-04-14 (Tue, 14 Apr 2026)

  Changed paths:
    M clang/include/clang/Driver/ToolChain.h
    M clang/lib/Driver/ToolChain.cpp
    M clang/lib/Driver/ToolChains/BareMetal.cpp
    M clang/lib/Driver/ToolChains/BareMetal.h
    M clang/lib/Driver/ToolChains/CommonArgs.cpp
    M clang/lib/Driver/ToolChains/Gnu.cpp
    M clang/lib/Driver/ToolChains/Linux.cpp
    M clang/lib/Driver/ToolChains/MinGW.cpp
    A clang/test/Driver/linux-multilib.yaml
    A clang/test/Driver/mingw-multilib.yaml

  Log Message:
  -----------
  [Clang] Enable multilib library support for Linux/Windows (#188584)

Summary:
This PR standardizes the logic used in the baremtal build to the common
toolchain interface. We then use this to handle the support in Linux and
Windows.

The multilib functionality allows us to select variant libraries based
off of a configuration file. For example, if the `multilib.yaml` file
detects `-fsanitize=address` it will automatically use the libraries
inside of `asan/` instead. These are layered so they do not necessarily
need to be complete library builds. More documentation can be found at
https://clang.llvm.org/docs/Multilib.html.

The motivation for this is so platforms like ROCm can use a more
standard way to ship debug / asan variants of libraries like OpenMP or
similar for both GPU an CPU targets.



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