kbuild: avoid running is_rust_module.sh if !RUST

Suggested-by: Nathan Chancellor <[email protected]>
Signed-off-by: Miguel Ojeda <[email protected]>

Author: ojeda

scripts/Makefile.modfinal

@@ -41,7 +41,7 @@ quiet_cmd_btf_ko = BTF [M] $@
       cmd_btf_ko = 							\
 	if [ ! -f vmlinux ]; then					\
 		printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
-	elif $(srctree)/scripts/is_rust_module.sh $@; then 		\
+	elif [ -n "$(CONFIG_RUST)" ] && $(srctree)/scripts/is_rust_module.sh $@; then 		\
 		printf "Skipping BTF generation for %s because it's a Rust module\n" $@ 1>&2; \
 	else								\
 		LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) --btf_base vmlinux $@; \