tbb 4.2.4

 - Fix LLVM failure

Formula/tbb.rb

@@ -1,30 +1,39 @@
-require 'formula'
+require "formula"
 
 class Tbb < Formula
-  homepage 'http://www.threadingbuildingblocks.org/'
-  url 'https://www.threadingbuildingblocks.org/sites/default/files/software_releases/source/tbb42_20140122oss_src.tgz'
-  sha1 'd897a6ced4f425c6608422a2e19218898e727260'
-  version '4.2.3'
+  homepage "http://www.threadingbuildingblocks.org/"
+  url "https://www.threadingbuildingblocks.org/sites/default/files/software_releases/source/tbb42_20140416oss_src.tgz"
+  sha1 "1285471b4dce67cf3edf20a071db37f4f205bcf1"
+  version "4.2.4"
 
   option :cxx11
 
-  fails_with :llvm do
-    cause 'llvm is not supported on macos. Add build/macos.llvm.inc file with compiler-specific settings.'
-  end
-
   def install
     # Intel sets varying O levels on each compile command.
     ENV.no_optimization
-    ENV.cxx11 if build.cxx11?
-    # Override build prefix so we can copy the dylibs out of the same place
-    # no matter what system we're on, and use our compilers.
-    compiler = ENV.compiler.to_s.start_with?('gcc') ? 'gcc' : ENV.compiler
-    args = ['tbb_build_prefix=BUILDPREFIX',
-            "compiler=#{compiler}"]
-    args << (MacOS.prefer_64_bit? ? "arch=intel64" : "arch=ia32")
-    args << "cpp0x=1" << "stdlib=libc++" if build.cxx11?
+
+    args = %W[tbb_build_prefix=BUILDPREFIX]
+
+    case ENV.compiler
+    when :clang
+      args << "compiler=clang"
+    else
+      args << "compiler=gcc"
+    end
+
+    if MacOS.prefer_64_bit?
+      args << "arch=intel64"
+    else
+      args << "arch=ia32"
+    end
+
+    if build.cxx11?
+      ENV.cxx11
+      args << "cpp0x=1" << "stdlib=libc++"
+    end
+
     system "make", *args
-    lib.install Dir['build/BUILDPREFIX_release/*.dylib']
-    include.install 'include/tbb'
+    lib.install Dir["build/BUILDPREFIX_release/*.dylib"]
+    include.install "include/tbb"
   end
 end