diff --git a/lld/CMakeLists.txt b/lld/CMakeLists.txt
--- a/lld/CMakeLists.txt
+++ b/lld/CMakeLists.txt
@@ -174,6 +174,12 @@
 option(LLD_BUILD_TOOLS
   "Build the lld tools. If OFF, just generate build targets." ON)
 
+option(LLD_DEFAULT_LD_LLD_IS_MINGW
+    "Use MinGW as the default backend for ld.lld. If OFF, ELF will be used." OFF)
+if (LLD_DEFAULT_LD_LLD_IS_MINGW)
+  add_definitions("-DLLD_DEFAULT_LD_LLD_IS_MINGW=1")
+endif()
+
 if (MSVC)
   add_definitions(-wd4530) # Suppress 'warning C4530: C++ exception handler used, but unwind semantics are not enabled.'
   add_definitions(-wd4062) # Suppress 'warning C4062: enumerator X in switch of enum Y is not handled' from system header.
diff --git a/lld/tools/lld/lld.cpp b/lld/tools/lld/lld.cpp
--- a/lld/tools/lld/lld.cpp
+++ b/lld/tools/lld/lld.cpp
@@ -92,7 +92,12 @@
       continue;
     return isPETargetName(*(it + 1));
   }
+
+#ifdef LLD_DEFAULT_LD_LLD_IS_MINGW
+  return true;
+#else
   return false;
+#endif
 }
 
 static Flavor parseProgname(StringRef progname) {