This is a note to let you know that I've just added the patch titled kbuild: Add $(KBUILD_HOSTLDFLAGS) to 'has_libelf' test to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kbuild-add-kbuild_hostldflags-to-has_libelf-test.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From f634ca650f724347892068489c7920631a3aac6a Mon Sep 17 00:00:00 2001 From: Nathan Chancellor <nathan@xxxxxxxxxx> Date: Thu, 22 Apr 2021 13:19:14 -0700 Subject: kbuild: Add $(KBUILD_HOSTLDFLAGS) to 'has_libelf' test From: Nathan Chancellor <nathan@xxxxxxxxxx> commit f634ca650f724347892068489c7920631a3aac6a upstream. Normally, invocations of $(HOSTCC) include $(KBUILD_HOSTLDFLAGS), which in turn includes $(HOSTLDFLAGS), which allows users to pass in their own flags when linking. However, the 'has_libelf' test does not, meaning that if a user requests a specific linker via HOSTLDFLAGS=-fuse-ld=..., it is not respected and the build might error. For example, if a user building with clang wants to use all of the LLVM tools without any GNU tools, they might remove all of the GNU tools from their system or PATH then build with $ make HOSTLDFLAGS=-fuse-ld=lld LLVM=1 LLVM_IAS=1 which says use all of the LLVM tools, the integrated assembler, and ld.lld for linking host executables. Without this change, the build will error because $(HOSTCC) uses its default linker, rather than the one requested via -fuse-ld=..., which is GNU ld in clang's case in a default configuration. error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel make[1]: *** [Makefile:1260: prepare-objtool] Error 1 Add $(KBUILD_HOSTLDFLAGS) to the 'has_libelf' test so that the linker choice is respected. Link: https://github.com/ClangBuiltLinux/linux/issues/479 Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx> Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx> Signed-off-by: Paul Barker <paul.barker@xxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/Makefile +++ b/Makefile @@ -1022,7 +1022,7 @@ HOST_LIBELF_LIBS = $(shell pkg-config li ifdef CONFIG_STACK_VALIDATION has_libelf := $(call try-run,\ - echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) + echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) ifeq ($(has_libelf),1) objtool_target := tools/objtool FORCE else Patches currently in stable-queue which might be from nathan@xxxxxxxxxx are queue-5.4/kbuild-add-kbuild_hostldflags-to-has_libelf-test.patch