1 files changed, 30 insertions, 0 deletions
diff --git a/win32/ifchange.bat b/win32/ifchange.bat
new file mode 100755
index 0000000000..61a80c841b
--- /dev/null
+++ b/win32/ifchange.bat
@@ -0,0 +1,30 @@
+@echo off
+:: usage: ifchange target temporary
+
+:: check if fc.exe works.
+echo foo > conftest1.tmp
+echo bar > conftest2.tmp
+fc.exe conftest1.tmp conftest2.tmp > nul
+if not errorlevel 1 goto :brokenfc
+
+:: 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
+copy %2 %1 > nul
+:end