Reduce footprint of fails_with_llvm compat code

Library/Homebrew/compat/compatibility.rb

@@ -76,18 +76,18 @@ class Formula
   # up in the DSL section.
   def fails_with_llvm msg=nil, data=nil
     opoo "Calling fails_with_llvm in the install method is deprecated"
-    puts "Use the fails_with DSL instead."
-    FailsWithLLVM.new(msg, data).handle_failure
+    puts "Use the fails_with DSL instead"
   end
 
   def fails_with_llvm?
     fails_with? :llvm
   end
 
-  def self.fails_with_llvm msg=nil, data=nil
-    fails_with_llvm_reason = FailsWithLLVM.new(msg, data)
+  def self.fails_with_llvm msg=nil, data={}
+    case msg when Hash then data = msg end
+    failure = CompilerFailure.new(:llvm) { build(data.delete(:build).to_i) }
     @cc_failures ||= Set.new
-    @cc_failures << fails_with_llvm_reason
+    @cc_failures << failure
   end
 
   def std_cmake_parameters
@@ -133,55 +133,6 @@ module HomebrewEnvExtension extend self
   end
 end
 
-class FailsWithLLVM
-  attr_reader :compiler, :build, :cause
-
-  def initialize msg=nil, data=nil
-    if msg.nil? or msg.kind_of? Hash
-      @cause = "(No specific reason was given)"
-      data = msg
-    else
-      @cause = msg
-    end
-    @build = (data.delete :build rescue nil).to_i
-    @compiler = :llvm
-  end
-
-  def handle_failure
-    return unless ENV.compiler == :llvm
-
-    # version 2336 is the latest version as of Xcode 4.2, so it is the
-    # latest version we have tested against so we will switch to GCC and
-    # bump this integer when Xcode 4.3 is released. TODO do that!
-    if build.to_i >= 2336
-      if MacOS::Xcode.version < "4.2"
-        opoo "Formula will not build with LLVM, using GCC"
-        ENV.gcc
-      else
-        opoo "Formula will not build with LLVM, trying Clang"
-        ENV.clang
-      end
-      return
-    end
-    opoo "Building with LLVM, but this formula is reported to not work with LLVM:"
-    puts
-    puts cause
-    puts
-    puts <<-EOS.undent
-      We are continuing anyway so if the build succeeds, please open a ticket with
-      the following information: #{MacOS.llvm_build_version}-#{MACOS_VERSION}. So
-      that we can update the formula accordingly. Thanks!
-      EOS
-    puts
-    if MacOS::Xcode.version < "4.2"
-      puts "If it doesn't work you can: brew install --use-gcc"
-    else
-      puts "If it doesn't work you can try: brew install --use-clang"
-    end
-    puts
-  end
-end
-
 # TODO eventually some of these should print deprecation warnings
 module MacOS extend self
   def xcode_folder