From b1bc9ec809923782be6cfb7ff71e5c6cf9f98daa Mon Sep 17 00:00:00 2001
From: Mike McQuaid <mike@mikemcquaid.com>
Date: Thu, 31 Jan 2013 21:47:19 -0800
Subject: [PATCH] Don't let xcrun find superenv tools.

Causes an infinite loop when trying to find e.g. missing gcc.

Closes Homebrew/homebrew#17426
References Homebrew/homebrew#17455
---
 Library/Homebrew/macos.rb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Library/Homebrew/macos.rb b/Library/Homebrew/macos.rb
index 891e458f33..47573e3a36 100644
--- a/Library/Homebrew/macos.rb
+++ b/Library/Homebrew/macos.rb
@@ -39,6 +39,9 @@ module MacOS extend self
           `/usr/bin/xcrun -find #{tool} 2>/dev/null`.chomp
         end
 
+        # If xcrun finds a superenv tool then discard the result.
+        xcrun_path = nil if xcrun_path.include? HOMEBREW_PREFIX+"Library/ENV"
+
         paths = %W[#{xcrun_path}
                    #{dev_tools_path}/#{tool}
                    #{xctoolchain_path}/usr/bin/#{tool}]