Enhance host bcc to allow cross-compilation (eg. debug arm codegen on host):
 eg. bcc -C armv7-none-linux-gnueabi # generate ARMv7
     bcc -C i686-unknown-linux       # generate x86 (default on Goobuntu)
 Other targets are not supported at this moment.

Change-Id: If2f1199656664327cf35cf6a3670136f48c42cad
diff --git a/lib/ExecutionEngine/Compiler.cpp b/lib/ExecutionEngine/Compiler.cpp
index dd370d9..4351079 100644
--- a/lib/ExecutionEngine/Compiler.cpp
+++ b/lib/ExecutionEngine/Compiler.cpp
@@ -91,6 +91,20 @@
 
 bool Compiler::GlobalInitialized = false;
 
+
+#if !defined(__HOST__)
+  #define TARGET_TRIPLE_STRING  DEFAULT_TARGET_TRIPLE_STRING
+#else
+// In host TARGET_TRIPLE_STRING is a variable to allow cross-compilation.
+  #if defined(__cplusplus)
+    extern "C" {
+  #endif
+      char *TARGET_TRIPLE_STRING = (char*)DEFAULT_TARGET_TRIPLE_STRING;
+  #if defined(__cplusplus)
+    };
+  #endif
+#endif
+
 // Code generation optimization level for the compiler
 llvm::CodeGenOpt::Level Compiler::CodeGenOptLevel;