redhat: make ENABLE_WERROR enable also OBJTOOL_WERROR

JIRA: https://issues.redhat.com/browse/RHEL-85302
Upstream Status: RHEL only

We don't want to enable CONFIG_OBJTOOL_WERROR for OOT / third-party
module builds by default, so tie its enablement to CONFIG_WERROR which
has the ENABLE_WERROR Makefile variable toggle.

Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>

Author: joe-lawrence

redhat/configs/build_configs.sh

@@ -112,6 +112,7 @@ function merge_configs()
 
 	if [ -n "$ENABLE_WERROR" ]; then
 		sed -i "s|# CONFIG_WERROR is not set|CONFIG_WERROR=y|g" "$name"
+		sed -i "s|# CONFIG_OBJTOOL_WERROR is not set|CONFIG_OBJTOOL_WERROR=y|g" "$name"
 	fi
 
 	rm -f config-merged."$count" config-merging."$count"

scripts/Makefile.lib

@@ -258,7 +258,10 @@ objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE)		+= --static-call
 objtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION)		+= --uaccess
 objtool-args-$(CONFIG_GCOV_KERNEL)			+= --no-unreachable
 objtool-args-$(CONFIG_PREFIX_SYMBOLS)			+= --prefix=$(CONFIG_FUNCTION_PADDING_BYTES)
+# RHEL-only: don't enforce OBJTOOL_WERROR for out of tree modules
+ifeq ($(KBUILD_EXTMOD),)
 objtool-args-$(CONFIG_OBJTOOL_WERROR)			+= --Werror --backtrace
+endif
 
 objtool-args = $(objtool-args-y)					\
 	$(if $(delay-objtool), --link)					\