Index: lib/ExecutionEngine/ExecutionEngineBindings.cpp
===================================================================
--- lib/ExecutionEngine/ExecutionEngineBindings.cpp	(revision 164482)
+++ lib/ExecutionEngine/ExecutionEngineBindings.cpp	(working copy)
@@ -13,6 +13,7 @@
 
 #define DEBUG_TYPE "jit"
 #include "llvm-c/ExecutionEngine.h"
+#include "llvm/ADT/Triple.h"
 #include "llvm/ExecutionEngine/GenericValue.h"
 #include "llvm/ExecutionEngine/ExecutionEngine.h"
 #include "llvm/Support/ErrorHandling.h"
@@ -123,7 +124,8 @@
   EngineBuilder builder(unwrap(M));
   builder.setEngineKind(EngineKind::JIT)
          .setErrorStr(&Error)
-         .setOptLevel((CodeGenOpt::Level)OptLevel);
+         .setOptLevel((CodeGenOpt::Level)OptLevel)
+         .setMArch(Triple(unwrap(M)->getTargetTriple()).getArchName());
   if (ExecutionEngine *JIT = builder.create()) {
     *OutJIT = wrap(JIT);
     return 0;