Add util to makefile

makefile

@@ -10,6 +10,7 @@ help:
 	@echo "Available make targets:"
 	@echo "  clean   Remove output files"
 	@echo "  core    Check the C core source for compiler warnings"
+	@echo "  util    Check the C utility source for compiler warnings"
 	@echo "  wasm    Build the WebAssembly module"
 	@echo
 
@@ -47,6 +48,17 @@ util:
 #	GCC generic
 	@gcc util/vbu.c -I core -I util -c -o /dev/null -O3 \
         -Werror -std=c90 -Wall -Wextra -Wpedantic -fno-strict-aliasing
+#	GCC compilation control
+	@gcc util/vbu.c -I core -I util -c -o /dev/null -O3 \
+        -Werror -std=c90 -Wall -Wextra -Wpedantic -fno-strict-aliasing \
+        -D VB_SIGNED_PROPAGATE -D VBU_REALLOC=testRealloc
+#	Clang generic
+	@emcc util/vbu.c -I core -I util -c -o /dev/null -O3 \
+        -Werror -std=c90 -Wall -Wextra -Wpedantic -fno-strict-aliasing
+#	Clang compilation control
+	@emcc util/vbu.c -I core -I util -c -o /dev/null -O3 \
+        -Werror -std=c90 -Wall -Wextra -Wpedantic -fno-strict-aliasing \
+        -D VB_SIGNED_PROPAGATE -D VBU_REALLOC=testRealloc
 
 .PHONY: wasm
 wasm: