Index: llvm/cmake/modules/CMakeLists.txt
===================================================================
--- llvm/cmake/modules/CMakeLists.txt
+++ llvm/cmake/modules/CMakeLists.txt
@@ -135,7 +135,11 @@
 
 # Generate a default location for lit
 if (LLVM_INSTALL_UTILS AND LLVM_BUILD_UTILS)
-  set(LLVM_CONFIG_DEFAULT_EXTERNAL_LIT "${LLVM_CONFIG_TOOLS_BINARY_DIR}/llvm-lit")
+  if (CMAKE_HOST_WIN32 AND NOT CYGWIN)
+    set(LLVM_CONFIG_DEFAULT_EXTERNAL_LIT "${LLVM_CONFIG_TOOLS_BINARY_DIR}/llvm-lit.py")
+  else()
+    set(LLVM_CONFIG_DEFAULT_EXTERNAL_LIT "${LLVM_CONFIG_TOOLS_BINARY_DIR}/llvm-lit")
+  endif()
 endif()
 
 get_config_exports_includes(LLVM LLVM_CONFIG_INCLUDE_EXPORTS)