1 files changed, 59 insertions, 0 deletions
diff --git a/trunk/win32/ifchange.bat b/trunk/win32/ifchange.bat
new file mode 100755
index 0000000000..8411099020
--- /dev/null
+++ b/trunk/win32/ifchange.bat
@@ -0,0 +1,59 @@
+@echo off
+:: usage: ifchange target temporary
+
+if "%1" == "" goto :end
+
+set dest=%1
+set src=%2
+set dest=%dest:/=\%
+set src=%src:/=\%
+if not "%dest%" == "" if not "%dest%" == "%%dest:/=\%%" goto :nt
+
+if not exist %2 goto :end
+
+:: check if fc.exe works.
+echo foo > conftst1.tmp
+echo bar > conftst2.tmp
+fc.exe conftst1.tmp conftst2.tmp > nul
+if not errorlevel 1 goto :brokenfc
+del conftst1.tmp > nul
+del conftst2.tmp > nul
+
+:: target does not exist or new file differs from it.
+if not exist %1 goto :update
+fc.exe %1 %2 > nul
+if errorlevel 1 goto :update
+
+:unchange
+echo %1 unchanged.
+del %2
+goto :end
+
+:brokenfc
+del conftest1.tmp > nul
+del conftest2.tmp > nul
+echo FC.EXE does not work properly.
+echo assuming %1 should be changed.
+
+:update
+echo %1 updated.
+:: if exist %1 del %1
+dir /b %2
+copy %2 %1
+del %2
+goto :end
+
+:nt
+if not exist %src% goto :end
+if exist %dest% (
+    fc.exe %dest% %src% > nul && (
+	echo %dest% unchanged.
+	del %src%
+	goto :end
+    )
+)
+echo %dest% updated.
+copy %src% %dest% > nul
+del %src%
+
+:end