diff --git a/llvm/unittests/Support/CMakeLists.txt b/llvm/unittests/Support/CMakeLists.txt
--- a/llvm/unittests/Support/CMakeLists.txt
+++ b/llvm/unittests/Support/CMakeLists.txt
@@ -103,6 +103,9 @@
   raw_pwrite_stream_test.cpp
   raw_sha1_ostream_test.cpp
   xxhashTest.cpp
+
+  DEPENDS
+  intrinsics_gen
   )
 
 target_link_libraries(SupportTests PRIVATE LLVMTestingSupport)