From 61a8bd9ca0d30c571212f534e4262715fba72e49 Mon Sep 17 00:00:00 2001
From: Max Howell <max@methylblue.com>
Date: Tue, 21 Feb 2012 10:32:48 +0000
Subject: [PATCH] Don't hang if xcode-select -print-path is "/"

Introducing MacOS.xctools_fucked?.

Refs Homebrew/homebrew#10293.
---
 Library/Homebrew/cmd/--env.rb  |  2 +-
 Library/Homebrew/extend/ENV.rb |  2 +-
 Library/Homebrew/utils.rb      | 12 ++++++++++--
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/Library/Homebrew/cmd/--env.rb b/Library/Homebrew/cmd/--env.rb
index d020ac0ac9..9f5f4bb7ad 100644
--- a/Library/Homebrew/cmd/--env.rb
+++ b/Library/Homebrew/cmd/--env.rb
@@ -18,7 +18,7 @@ module Homebrew extend self
       value = env[k]
       if value
         results = value
-        if value =~ /^[^\s]*xcrun (.*)/
+        if value =~ %r{/usr/bin/xcrun (.*)}
           path = `/usr/bin/xcrun -find #{$1}`
           results += " => #{path}"
         elsif File.exists? value and File.symlink? value
diff --git a/Library/Homebrew/extend/ENV.rb b/Library/Homebrew/extend/ENV.rb
index 0373bced11..2f2a0d90a9 100644
--- a/Library/Homebrew/extend/ENV.rb
+++ b/Library/Homebrew/extend/ENV.rb
@@ -94,7 +94,7 @@ module HomebrewEnvExtension
   def xcrun tool
     if File.executable? "/usr/bin/#{tool}"
       "/usr/bin/#{tool}"
-    elsif system "/usr/bin/xcrun -find #{tool} 2>1 1>/dev/null"
+    elsif not MacOS.xctools_fucked? and system "/usr/bin/xcrun -find #{tool} 2>1 1>/dev/null"
       # xcrun was provided first with Xcode 4.3 and allows us to proxy
       # tool usage thus avoiding various bugs
       "/usr/bin/xcrun #{tool}"
diff --git a/Library/Homebrew/utils.rb b/Library/Homebrew/utils.rb
index 2854c82b15..2ad5cbc784 100644
--- a/Library/Homebrew/utils.rb
+++ b/Library/Homebrew/utils.rb
@@ -266,9 +266,17 @@ module MacOS extend self
     end
   end
 
+  def xctools_fucked?
+    # Xcode 4.3 tools hang if "/" is set
+    `/usr/bin/xcode-select -print-path 2>/dev/null`.chomp == "/"
+  end
+
   def default_cc
-    cc = `/usr/bin/xcrun -find cc 2> /dev/null`.chomp
-    cc = "#{dev_tools_path}/cc" if cc.empty? or not $?.success?
+    cc = unless xctools_fucked?
+      out = `/usr/bin/xcrun -find cc 2> /dev/null`.chomp
+      out if $?.success?
+    end
+    cc = "#{dev_tools_path}/cc" if cc.nil? or cc.empty?
 
     unless File.executable? cc
       # If xcode-select isn't setup then xcrun fails and on Xcode 4.3