[clang] [Clang] Rework LTO mode selection to be a Toolchain property (PR #201155)

Wed Jun 3 09:48:09 PDT 2026

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-sie-ubuntu-fast` running on `sie-linux-worker` while building `clang` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/144/builds/55446

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (build-unified-tree) failure: build (failure)
...
8.828 [149/40/48] Building CXX object tools/lld/Common/CMakeFiles/lldCommon.dir/Version.cpp.o
8.883 [148/40/49] Linking CXX static library lib/liblldCommon.a
8.991 [147/40/50] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Haiku.cpp.o
9.038 [146/40/51] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Cuda.cpp.o
9.488 [145/40/52] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChain.cpp.o
9.701 [144/40/53] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/HIPSPV.cpp.o
9.735 [143/40/54] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Managarm.cpp.o
9.998 [142/40/55] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/HIPAMD.cpp.o
10.373 [141/40/56] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/MipsLinux.cpp.o
10.613 [140/40/57] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Clang.cpp.o
FAILED: tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Clang.cpp.o 
CCACHE_CPP2=yes CCACHE_HASHDIR=yes CCACHE_SLOPPINESS=pch_defines,time_macros /usr/bin/ccache /usr/bin/g++ -DCLANG_EXPORTS -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/tools/clang/lib/Driver -I/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/lib/Driver -I/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/include -I/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/tools/clang/include -I/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/include -I/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-array-bounds -Wno-stringop-overread -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -O3 -DNDEBUG -UNDEBUG -fno-exceptions -funwind-tables -fno-rtti -std=c++17 -MD -MT tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Clang.cpp.o -MF tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Clang.cpp.o.d -o tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Clang.cpp.o -c /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/lib/Driver/ToolChains/Clang.cpp
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/lib/Driver/ToolChains/Clang.cpp: In member function ‘virtual void clang::driver::tools::LinkerWrapper::ConstructJob(clang::driver::Compilation&, const clang::driver::JobAction&, const clang::driver::InputInfo&, const InputInfoList&, const llvm::opt::ArgList&, const char*) const’:
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/lib/Driver/ToolChains/Clang.cpp:9832:23: error: ‘const class clang::driver::Driver’ has no member named ‘getOffloadLTOMode’; did you mean ‘enum clang::driver::Driver::OffloadMode’? (not accessible from this context)
 9832 |     if (C.getDriver().getOffloadLTOMode() == LTOK_None && !UsesProfileGenerate)
      |                       ^~~~~~~~~~~~~~~~~
In file included from /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/include/clang/Driver/CudaInstallationDetector.h:13,
                 from /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/lib/Driver/ToolChains/MSVC.h:13,
                 from /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/lib/Driver/ToolChains/Clang.h:12,
                 from /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/lib/Driver/ToolChains/Clang.cpp:9:
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/clang/include/clang/Driver/Driver.h:120:8: note: declared private here
  120 |   enum OffloadMode {
      |        ^~~~~~~~~~~
10.894 [140/39/58] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Hurd.cpp.o
10.926 [140/38/59] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/SPIRVOpenMP.cpp.o
11.525 [140/37/60] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/OpenBSD.cpp.o
11.640 [140/36/61] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Fuchsia.cpp.o
11.658 [140/35/62] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/TCE.cpp.o
11.813 [140/34/63] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Hexagon.cpp.o
12.037 [140/33/64] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/HIPUtility.cpp.o
12.352 [140/32/65] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/NetBSD.cpp.o
12.395 [140/31/66] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Solaris.cpp.o
12.405 [140/30/67] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Serenity.cpp.o
12.465 [140/29/68] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/SPIRV.cpp.o
12.492 [140/28/69] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Darwin.cpp.o
12.585 [140/27/70] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/MinGW.cpp.o
12.685 [140/26/71] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/SYCL.cpp.o
12.820 [140/25/72] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/VEToolchain.cpp.o
12.824 [140/24/73] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/UEFI.cpp.o
12.837 [140/23/74] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/PPCFreeBSD.cpp.o
12.919 [140/22/75] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/Types.cpp.o
12.931 [140/21/76] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/MSVC.cpp.o
13.099 [140/20/77] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/XCore.cpp.o
13.132 [140/19/78] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Linux.cpp.o
13.149 [140/18/79] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/PPCLinux.cpp.o
13.204 [140/17/80] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/PS4CPU.cpp.o
13.397 [140/16/81] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/InterfaceStubs.cpp.o
13.478 [140/15/82] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/MSP430.cpp.o
13.840 [140/14/83] Building CXX object tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/OHOS.cpp.o

```

</details>

https://github.com/llvm/llvm-project/pull/201155