diff --git a/llvm/utils/TableGen/GICombinerEmitter.cpp b/llvm/utils/TableGen/GICombinerEmitter.cpp
--- a/llvm/utils/TableGen/GICombinerEmitter.cpp
+++ b/llvm/utils/TableGen/GICombinerEmitter.cpp
@@ -1019,6 +1019,10 @@
 //===----------------------------------------------------------------------===//
 
 static void EmitGICombiner(RecordKeeper &RK, raw_ostream &OS) {
+  PrintWarning(
+      "'-gen-global-isel-combiner' is deprecated and will be removed soon; "
+      "please use '-gen-global-isel-combiner-match-table' instead");
+
   CodeGenTarget Target(RK);
   emitSourceFileHeader("Global Combiner", OS);