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kbuild: AutoFDO: Update split machine function argument for upstream rename

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A recent LLVM commit [1] renamed the internal LLVM plugin option
'-split-machine-functions' to '-function-splitting=all', breaking the
AutoFDO + ThinLTO build with:

  ld.lld: error: -plugin-opt=-: ld.lld: Unknown command line argument '-split-machine-functions'.  Try: 'ld.lld --help'

The plugin option is needed for in-process ThinLTO, so handle the rename
accordingly using ld-option.

Cc: stable@vger.kernel.org
Closes: https://github.com/ClangBuiltLinux/linux/issues/2186
Fixes: 2fd65f7afd ("AutoFDO: Enable machine function split optimization for AutoFDO")
Link: 3e6acc87c5 [1]
Link: https://patch.msgid.link/20261014-update-autofdo-split-machine-function-option-v1-1-5c71b3005e89@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
This commit is contained in:
Nathan Chancellor 2026-10-14 16:40:41 -07:00
parent 46d4ccf3b6
commit 2b358510d5
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GPG Key ID: 1D6B269171C01A96
1 changed files with 1 additions and 1 deletions
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2
scripts/Makefile.autofdo
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@ -22,7 +22,7 @@ ifdef CONFIG_LTO_CLANG_THIN
KBUILD_LDFLAGS += --lto-sample-profile=$(CLANG_AUTOFDO_PROFILE)
endif
KBUILD_LDFLAGS += --mllvm=-enable-fs-discriminator=true --mllvm=-improved-fs-discriminator=true -plugin-opt=thinlto
KBUILD_LDFLAGS += -plugin-opt=-split-machine-functions
KBUILD_LDFLAGS += $(call ld-option,-plugin-opt=-function-splitting=all,-plugin-opt=-split-machine-functions)
endif
export CFLAGS_AUTOFDO_CLANG RUSTFLAGS_AUTOFDO_CLANG