From 28a00e9d6cccf3fd4b483d2c2f684073c4aae999 Mon Sep 17 00:00:00 2001
From: Mike McQuaid <mike@mikemcquaid.com>
Date: Mon, 21 Nov 2016 08:49:29 +0000
Subject: [PATCH] development_tools: return llvm_clang Version class.

This was implemented before the rest of the file was refactored.
---
 Library/Homebrew/development_tools.rb | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Library/Homebrew/development_tools.rb b/Library/Homebrew/development_tools.rb
index 1ae051be06..ea7f5837d0 100644
--- a/Library/Homebrew/development_tools.rb
+++ b/Library/Homebrew/development_tools.rb
@@ -85,12 +85,18 @@ class DevelopmentTools
         else
           Version::NULL
         end
+      end
     end
 
     def llvm_clang_build_version
-      @llvm_clang_build_version ||= if Tab.for_name "llvm"
+      @llvm_clang_build_version ||= begin
         path = Formulary.factory("llvm").opt_prefix/"bin/clang"
-        `#{path} --version`[/clang version (\d\.\d\.\d)/, 1]
+        if path.executable? &&
+           build_version = `#{path} --version`[/clang version (\d\.\d\.\d)/, 1]
+          Version.new build_version
+        else
+          Version::NULL
+        end
       end
     end