From 2a8f11112ce7a5475c50a81e055b92b6120e3f59 Mon Sep 17 00:00:00 2001
From: Alon Zakai <alonzakai@gmail.com>
Date: Fri, 14 Mar 2014 19:42:52 -0700
Subject: warn if given the wrong triple

---
 lib/Target/JSBackend/JSBackend.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/Target/JSBackend/JSBackend.cpp b/lib/Target/JSBackend/JSBackend.cpp
index 0e0e199c49..76f1a630e0 100644
--- a/lib/Target/JSBackend/JSBackend.cpp
+++ b/lib/Target/JSBackend/JSBackend.cpp
@@ -2346,6 +2346,10 @@ void JSWriter::printModule(const std::string& fname,
 }
 
 bool JSWriter::runOnModule(Module &M) {
+  if (M.getTargetTriple() != "asmjs-unknown-emscripten") {
+    prettyWarning() << "incorrect target triple '" << M.getTargetTriple() << "' (did you use emcc/em++ on all source files and not clang directly?)\n";
+  }
+
   TheModule = &M;
   DL = &getAnalysis<DataLayout>();
 
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