The tests target already passes ARCH and CROSS_COMPILE into run-tests.sh. lib.sh uses those to pick a default compiler and binutils: CC=${CC:-${CROSS_COMPILE}gcc} LD=${LD:-${CROSS_COMPILE}ld} READELF=${READELF:-${CROSS_COMPILE}readelf} OBJCOPY=${OBJCOPY:-${CROSS_COMPILE}objcopy} Those defaults only apply when the variables reach the shell that sources lib.sh. The recipe passed OBJTOOL, ARCH and CROSS_COMPILE explicitly, but not CC or the binutils. Makefile-assigned values (e.g. from LLVM=1) are not visible in the recipe environment unless forwarded: $ LLVM=1 make -C tools/objtool tests ... # preflight # compiler gcc (GCC) ... Pass CC, LD, READELF and OBJCOPY the same way as ARCH and CROSS_COMPILE, so fixtures are built and inspected with the toolchain make selected: $ LLVM=1 make -C tools/objtool tests ... # preflight # compiler clang version 21.1.8 ... Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com> Signed-off-by: Song Liu <song@kernel.org> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Assisted-by: Claude:claude-opus-5 Link: https://patch.msgid.link/20260916184351.2720310-12-song@kernel.org