use cparser-beta for additional syntax/warning checks if available

Makefile

@@ -160,8 +160,12 @@ $(libfirm_dll): $(libfirm_OBJECTS)
 
 # Generic rules
 UNUSED := $(shell mkdir -p $(libfirm_DIRS:%=$(builddir)/%))
+# Determine if we can use cparser-beta for quickcheck
+QUICKCHECK ?= $(shell which cparser-beta || echo true) -fsyntax-only
+
 $(builddir)/%.o: %.c $(IR_SPEC_GENERATED_FILES) config.h
 	@echo CC $@
+	$(Q)$(QUICKCHECK) $(CFLAGS) $(CPPFLAGS) $(libfirm_CPPFLAGS) $<
 	$(Q)$(CC) $(CFLAGS) $(CPPFLAGS) $(libfirm_CPPFLAGS) -MMD -c -o $@ $<
 
 $(docdir)/libfirm.tag: $(IR_SPEC_GENERATED_FILES) Doxyfile $(wildcard include/libfirm/*.h) $(wildcard include/libfirm/adt/*.h)