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kbuild: Use ld.lld for linking host programs when LLVM is set

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Currently, host programs are linked with HOSTCC using the toolchain's
default linker. This can result in confusing behavior when using the
LLVM Kbuild variable (which states that the user would like to build
with the LLVM toolchain instead of the GNU one), as clang's default
linker is ld for most platforms, not ld.lld. The documentation mentions
HOSTLD=ld.lld is set but this variable is not used by Kbuild proper,
only within some tools/ projects. Kbuild provides the HOSTLDFLAGS
variable, which allow users to provide the '-fuse-ld' or '--ld-path'
flags to customize what linker is used, but this is not super obvious to
folks not familiar with Kbuild.

If the user has not customized the linker already using one of these
flags, default to ld.lld when using the LLVM variable, which is more in
line with user expectations when using that variable.

Closes: https://github.com/ClangBuiltLinux/linux/issues/2167
Link: https://patch.msgid.link/20260610-kbuild-use-lld-for-linking-hostprogs-v1-1-70396fe42ee3@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
This commit is contained in:
Nathan Chancellor 2026-06-10 12:55:25 -07:00
parent 1a1e62a5a4
commit 7158c5b67e
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1 changed files with 3 additions and 0 deletions
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3
Makefile
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@ -525,6 +525,9 @@ OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
ifeq ($(filter -fuse-ld=% --ld-path=%,$(KBUILD_HOSTLDFLAGS)),)
KBUILD_HOSTLDFLAGS += -fuse-ld=lld
endif
else
CC = $(CROSS_COMPILE)gcc
LD = $(CROSS_COMPILE)ld