X-Git-Url: https://git.dlugolecki.net.pl/?a=blobdiff_plain;f=Makefile.inc;h=a9d0c878f5fac0f940ac283be1f475a9f90c4624;hb=51bf608f680c4c2736144ecf9e3c21121ebbef9e;hp=f86ad01d7b2867f6d5869c446567a5b52557c61a;hpb=33ba39ee5fcff8327cb2a14b8826eb22a40c3be2;p=gedcom-parse.git

diff --git a/Makefile.inc b/Makefile.inc
index f86ad01..a9d0c87 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -1,4 +1,4 @@
-## File to include in other Makefile's, defining common commands
+## File to include in other Makefile's, defining common commands and rules
 # $Id$
 # $Name$
 
@@ -10,3 +10,18 @@ define replace-VERSION
   mv $$file.new $$file; \
   done
 endef
+
+%.tabgen.h:	%.tab.h
+	@if [ ! -r $(srcdir)/$@ ] ; \
+	then \
+          echo "Creating empty file for $@"; \
+	  touch $(srcdir)/$@; \
+	fi
+	@if diff $< $(srcdir)/$@ > /dev/null 2>&1; \
+	then \
+	  : ; \
+	else \
+	  echo "Updating $@"; \
+	  rm $(srcdir)/$@; \
+	  cp $(srcdir)/$< $(srcdir)/$@; \
+	fi