[all-commits] [llvm/llvm-project] 859ee9: [Clang] Set default LTO mode for AMDGCN/SPIR-V tar...

[Joseph Huber via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 859ee9d83ef227848a98c5948f887574f5e7420c
      https://github.com/llvm/llvm-project/commit/859ee9d83ef227848a98c5948f887574f5e7420c
  Author: Joseph Huber <huberjn at outlook.com>
  Date:   2026-06-09 (Tue, 09 Jun 2026)

  Changed paths:
    M clang/include/clang/Driver/ToolChain.h
    M clang/lib/Driver/Driver.cpp
    M clang/lib/Driver/ToolChains/AMDGPU.cpp
    M clang/lib/Driver/ToolChains/AMDGPU.h
    M clang/lib/Driver/ToolChains/AMDGPUOpenMP.h
    M clang/lib/Driver/ToolChains/Clang.cpp
    M clang/lib/Driver/ToolChains/HIPAMD.h
    M clang/lib/Driver/ToolChains/HIPSPV.cpp
    M clang/lib/Driver/ToolChains/HIPSPV.h
    M clang/test/Driver/amdgpu-openmp-sanitize-options.c
    M clang/test/Driver/amdgpu-openmp-toolchain.c
    M clang/test/Driver/hip-binding.hip
    M clang/test/Driver/hip-device-compile.hip
    M clang/test/Driver/hip-offload-compress-zlib.hip
    M clang/test/Driver/hip-offload-compress-zstd.hip
    M clang/test/Driver/hip-phases.hip
    M clang/test/Driver/hip-rdc-device-only.hip
    M clang/test/Driver/hip-sanitize-options.hip
    M clang/test/Driver/hip-save-temps.hip
    M clang/test/Driver/hip-spirv-backend-bindings.c
    M clang/test/Driver/hip-spirv-backend-opt.c
    M clang/test/Driver/hip-spirv-backend-phases.c
    M clang/test/Driver/hip-spirv-linker-crash.c
    M clang/test/Driver/hip-target-id.hip
    M clang/test/Driver/hip-toolchain-device-only.hip
    M clang/test/Driver/hip-toolchain-no-rdc.hip
    M clang/test/Driver/hip-toolchain-rdc-flto-partitions.hip
    M clang/test/Driver/hip-toolchain-rdc-separate.hip
    M clang/test/Driver/hip-toolchain-rdc-static-lib.hip
    M clang/test/Driver/hip-toolchain-rdc.hip
    M clang/test/Driver/hip-unbundle-preproc.hipi
    M clang/test/Driver/hipspv-toolchain-rdc-separate.hip
    M clang/test/Driver/hipspv-toolchain-rdc.hip
    M clang/test/Driver/hipspv-toolchain.hip
    M clang/test/Driver/openmp-offload-gpu.c
    M clang/test/Driver/spirv-amd-toolchain.c
    M clang/test/Driver/spirv-openmp-toolchain.c

  Log Message:
  -----------
  [Clang] Set default LTO mode for AMDGCN/SPIR-V targets to full (#201457)

Summary:
Previously we had several layers of if conditions that functionally
amounted to pretending like we were in LTO-mode. The previous changes
moved the LTO settings into the toolchain so we can now override it for
our offloading toolchains. This allows us to respect the LTO mode, where
previously there was no way to override it.

The main artifact of this PR should be trimming up the massive if
statement.

Some slight by-products on the old-driver path, but this can be
recovered with `-fno-offload-lto` and the old driver should be deleted
in a few months anyways.



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