Ticket #885: version.patch

version.pro

@@ -6 +6 @@
 ############################################################
 
 SVNTREEDIR = $$system(pwd)
-SVNVERSION = $$system(svnversion . 2>/dev/null)
+SVNVERCMD = svnversion $${SVNTREEDIR} 2>/dev/null
 
-isEmpty( SVNVERSION ) {
-    SVNVERSION = Unknown
-}
-
 SOURCES += version.cpp
 
 version.target = version.cpp 
 version.commands = echo 'const char *myth_source_version =' \
-'"'`(svnversion $${SVNTREEDIR} 2>/dev/null) || echo Unknown`'";' > version.cpp
+'"'`$${SVNVERCMD} || echo Unknown`'";' > /tmp/version.cpp.new;
+version.commands += if test -f version.cpp && diff version.cpp /tmp/version.cpp.new > /dev/null; then rm /tmp/version.cpp.new; else mv /tmp/version.cpp.new version.cpp; fi
 version.depends = FORCE 
 
 QMAKE_EXTRA_UNIX_TARGETS += version