separate warnflags for c,c++

Makefile

@@ -53,13 +53,17 @@ TODAY = $(shell date "+%Y-%m-%d")
 ARCHFLAGS ?= -maes -mavx2 -mbmi2 #TODO
 
 ifeq ($(CC),clang)
-WARNFLAGS += -Wgcc-compat
+WARNFLAGS_C += -Wgcc-compat
+endif
+
+ifeq ($(CXX),clang++)
+WARNFLAGS_CXX += -Wgcc-compat
 endif
 
 ARCHFLAGS += $(XARCHFLAGS)
-CFLAGS  = $(LANGFLAGS) $(WARNFLAGS) $(INCFLAGS) $(OFLAGS) $(ARCHFLAGS) $(GENFLAGS) $(XCFLAGS)
-PUB_CFLAGS  = $(LANGFLAGS) $(WARNFLAGS) $(PUB_INCFLAGS) $(OFLAGS) $(ARCHFLAGS) $(GENFLAGS) $(XCFLAGS)
-CXXFLAGS = $(LANGXXFLAGS) $(WARNFLAGS) $(INCFLAGS) $(OFLAGS) $(ARCHFLAGS) $(GENFLAGS) $(XCXXFLAGS)
+CFLAGS  = $(LANGFLAGS) $(WARNFLAGS) $(WARNFLAGS_C) $(INCFLAGS) $(OFLAGS) $(ARCHFLAGS) $(GENFLAGS) $(XCFLAGS)
+PUB_CFLAGS  = $(LANGFLAGS) $(WARNFLAGS) $(WARNFLAGS_C) $(PUB_INCFLAGS) $(OFLAGS) $(ARCHFLAGS) $(GENFLAGS) $(XCFLAGS)
+CXXFLAGS = $(LANGXXFLAGS) $(WARNFLAGS) $(WARNFLAGS_CXX) $(INCFLAGS) $(OFLAGS) $(ARCHFLAGS) $(GENFLAGS) $(XCXXFLAGS)
 LDFLAGS = $(XLDFLAGS)
 ASFLAGS = $(ARCHFLAGS) $(XASFLAGS)