Triple initialization.

Change-Id: I153e1e700f2730f8596249a70a0c7077dafc3de0
diff --git a/llvm-rs-cc.cpp b/llvm-rs-cc.cpp
index a746abe..37987d6 100644
--- a/llvm-rs-cc.cpp
+++ b/llvm-rs-cc.cpp
@@ -212,7 +212,8 @@
 
     Opts.mAllowRSPrefix = Args->hasArg(OPT_allow_rs_prefix);
 
-    Opts.mTriple = Args->getLastArgValue(OPT_triple);
+    Opts.mTriple = Args->getLastArgValue(OPT_triple,
+                                         "armv7-none-linux-gnueabi");
     Opts.mCPU = Args->getLastArgValue(OPT_target_cpu);
     Opts.mFeatures = Args->getAllArgValues(OPT_target_feature);