fix unnecessary rebuilding

git-svn-id: svn://svn.icculus.org/netradiant/trunk@42 61c419a2-8eb2-4b30-bcec-8cead039b335

diff --git a/Makefile b/Makefile
index 74ffcc38d5c679f205237a7f50aa9ebdc4f45b5f..a9feedc38a183bc7c099d844b9b294b00fae143e 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -687,15 +687,28 @@ makeversion:
        ver=`cat include/version.default`; \
        major=`echo $$ver | cut -d . -f 2`; \
        minor=`echo $$ver | cut -d . -f 3 | cut -d - -f 1`; \
-       echo "// generated header, see Makefile" > include/version.h; \
-       echo "#define RADIANT_VERSION \"$$ver\"" >> include/version.h; \
-       echo "#define RADIANT_MAJOR_VERSION \"$$major\"" >> include/version.h; \
-       echo "#define RADIANT_MINOR_VERSION \"$$minor\"" >> include/version.h; \
-       echo "$$major" > include/RADIANT_MAJOR; \
-       echo "$$minor" > include/RADIANT_MINOR; \
-       echo "$$ver" > include/version; \
-       echo "// generated header, see Makefile" > include/aboutmsg.h; \
-       echo "#define RADIANT_ABOUTMSG \"$(RADIANT_ABOUTMSG)\"" >> include/aboutmsg.h; \
+       echo "// generated header, see Makefile" > include/version.h.new; \
+       echo "#define RADIANT_VERSION \"$$ver\"" >> include/version.h.new; \
+       echo "#define RADIANT_MAJOR_VERSION \"$$major\"" >> include/version.h.new; \
+       echo "#define RADIANT_MINOR_VERSION \"$$minor\"" >> include/version.h.new; \
+       echo "$$major" > include/RADIANT_MAJOR.new; \
+       echo "$$minor" > include/RADIANT_MINOR.new; \
+       echo "$$ver" > include/version.new; \
+       echo "// generated header, see Makefile" > include/aboutmsg.h.new; \
+       echo "#define RADIANT_ABOUTMSG \"$(RADIANT_ABOUTMSG)\"" >> include/aboutmsg.h.new; \
+       mv_if_diff() \
+       { \
+               if diff $$1 $$2 >/dev/null 2>&1; then \
+                       rm -f $$1; \
+               else \
+                       mv $$1 $$2; \
+               fi; \
+       }; \
+       mv_if_diff include/version.h.new include/version.h; \
+       mv_if_diff include/RADIANT_MAJOR.new include/RADIANT_MAJOR; \
+       mv_if_diff include/RADIANT_MINOR.new include/RADIANT_MINOR; \
+       mv_if_diff include/version.new include/version; \
+       mv_if_diff include/aboutmsg.h.new include/aboutmsg.h
 
 .PHONY: install-data
 install-data: