From 8c5be90e41a1888f794746a786d5330276c95b89 Mon Sep 17 00:00:00 2001
From: Xu Cheng <xucheng@me.com>
Date: Thu, 8 Oct 2015 19:21:56 +0800
Subject: [PATCH] llvm: better test

---
 Formula/llvm.rb | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/Formula/llvm.rb b/Formula/llvm.rb
index d679ee2e66473..693867cddc7d8 100644
--- a/Formula/llvm.rb
+++ b/Formula/llvm.rb
@@ -175,6 +175,21 @@ def caveats
   end
 
   test do
-    system "#{bin}/llvm-config", "--version"
+    assert_equal prefix.to_s, shell_output("#{bin}/llvm-config --prefix").chomp
+
+    if build.with? "clang"
+      (testpath/"test.cpp").write <<-EOS.undent
+        #include <iostream>
+        using namespace std;
+
+        int main()
+        {
+          cout << "Hello World!" << endl;
+          return 0;
+        }
+      EOS
+      system "#{bin}/clang++", "test.cpp", "-o", "test"
+      system "./test"
+    end
   end
 end