Add a verify stanza to the Makefile to compare the option bits in markdown.h and mkdio.h

Makefile.in

@@ -20,7 +20,7 @@ MAN3PAGES=mkd-callbacks.3 mkd-functions.3 markdown.3 mkd-line.3
 
 all: $(PGMS) $(SAMPLE_PGMS)
 
-install: $(PGMS)
+install: $(PGMS) verify
 	@INSTALL_PROGRAM@ $(PGMS) $(DESTDIR)/$(BINDIR)
 	@INSTALL_DATA@ $(MKDLIB) $(DESTDIR)/$(LIBDIR)
 	@INSTALL_DATA@ mkdio.h $(DESTDIR)/$(INCDIR)
@@ -75,6 +75,9 @@ $(MKDLIB): $(OBJS)
 	$(AR) crv $(MKDLIB) $(OBJS)
 	$(RANLIB) $(MKDLIB)
 
+verify: tools/checkbits.sh
+	@tools/checkbits.sh && echo "headers are ok!"
+
 test:	$(PGMS) echo cols
 	@for x in tests/*.t; do \
 	    sh $$x || exit 1; \

tools/checkbits.sh

@@ -0,0 +1,8 @@
+#! /bin/sh
+
+trap "rm -f in.markdown.h in.mkdio.h" EXIT
+
+grep '#define MKD_' markdown.h | awk '$3 ~ /0x0/ {print $2,$3;}' > in.markdown.h
+grep '#define MKD_' mkdio.h | awk '$3 ~ /0x0/ {print $2,$3;}' > in.mkdio.h
+
+exec diff -c -bw in.markdown.h in.mkdio.h