gen-btf.sh emits a .btf.o file with BTF sections to be linked into
vmlinux in link-vmlinux.sh
This .btf.o file is created by compiling an emptystring with ${CC},
and then adding BTF sections into it with ${OBJCOPY}.
To ensure the .btf.o is linkable when cross-compiling with LLVM, we
have to also pass ${KBUILD_FLAGS}, which in particular control the
target word size.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202512240559.2M06DSX7-lkp@intel.com/
Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
---
scripts/gen-btf.sh | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/scripts/gen-btf.sh b/scripts/gen-btf.sh
index 06c6d8becaa2..12244dbe097c 100755
--- a/scripts/gen-btf.sh
+++ b/scripts/gen-btf.sh
@@ -96,7 +96,7 @@ gen_btf_o()
# deletes all symbols including __start_BTF and __stop_BTF, which will
# be redefined in the linker script.
info OBJCOPY "${btf_data}"
- echo "" | ${CC} ${CLANG_FLAGS} -c -x c -o ${btf_data} -
+ echo "" | ${CC} ${CLANG_FLAGS} ${KBUILD_CFLAGS} -c -x c -o ${btf_data} -
${OBJCOPY} --add-section .BTF=${ELF_FILE}.BTF \
--set-section-flags .BTF=alloc,readonly ${btf_data}
${OBJCOPY} --only-section=.BTF --strip-all ${btf_data}
--
2.52.0