diff --git a/builddefs/common_rules.mk b/builddefs/common_rules.mk
index 0e5731b4b8..c92ec6baba 100644
--- a/builddefs/common_rules.mk
+++ b/builddefs/common_rules.mk
@@ -72,6 +72,8 @@ endif
 endif
 CFLAGS += -Wall
 CFLAGS += -Wstrict-prototypes
+CFLAGS += $(call cc-option,-Wunused-but-set-variable=1,-Wunused-but-set-variable)
+CFLAGS += $(call cc-option,-Wunused-but-set-parameter=1,-Wunused-but-set-parameter)
 ifneq ($(strip $(ALLOW_WARNINGS)), yes)
     CFLAGS += -Werror
 endif
@@ -89,7 +91,8 @@ CXXFLAGS += -O$(OPT)
 CXXFLAGS += -w
 CXXFLAGS += -Wall
 CXXFLAGS += -Wundef
-
+CXXFLAGS += $(call cc-option,-Wunused-but-set-variable=1,-Wunused-but-set-variable)
+CXXFLAGS += $(call cc-option,-Wunused-but-set-parameter=1,-Wunused-but-set-parameter)
 ifneq ($(strip $(ALLOW_WARNINGS)), yes)
     CXXFLAGS += -Werror
 endif
diff --git a/builddefs/support.mk b/builddefs/support.mk
index 7ef7b9b041..de1d3fd5c4 100644
--- a/builddefs/support.mk
+++ b/builddefs/support.mk
@@ -4,7 +4,7 @@
 #   $(2) = option to use if $(1) is not supported
 #   $(3) = additional arguments to pass to the compiler during the test, but aren't contained in the output
 cc-option = $(shell \
-	if { echo 'int main(){return 0;}' | $(CC) $(1) $(3) -o /dev/null -x c /dev/null >/dev/null 2>&1; }; \
+	if { echo 'int main(){return 0;}' | $(CC) $(1) $(3) -Wl,--unresolved-symbols=ignore-all -o /dev/null -x c /dev/null >/dev/null 2>&1; }; \
 	then echo "$(1)"; else echo "$(2)"; fi)
 
 # Helper to pass comma character to make functions (use with `$(,)` to pass in `$(call ...)` arguments)