Simplify llvm formula.

* Stop shipping most binaries except llvm-config. Now llvm is supposed to be
  used as a library only.
* Add caveat to point user to homebrew-versions for full featured llvms.

Formula/llvm.rb

@@ -4,16 +4,6 @@ class Clang < Formula
   homepage  'http://llvm.org/'
   url       'http://llvm.org/releases/3.3/cfe-3.3.src.tar.gz'
   sha1      'ccd6dbf2cdb1189a028b70bcb8a22509c25c74c8'
-
-  head      'http://llvm.org/git/clang.git'
-end
-
-class CompilerRt < Formula
-  homepage  'http://llvm.org/'
-  url       'http://llvm.org/releases/3.3/compiler-rt-3.3.src.tar.gz'
-  sha1      '745386ec046e3e49742e1ecb6912c560ccd0a002'
-
-  head      'http://llvm.org/git/compiler-rt.git'
 end
 
 class Llvm < Formula
@@ -21,8 +11,6 @@ class Llvm < Formula
   url       'http://llvm.org/releases/3.3/llvm-3.3.src.tar.gz'
   sha1      'c6c22d5593419e3cb47cbcf16d967640e5cce133'
 
-  head      'http://llvm.org/git/llvm.git'
-
   bottle do
     sha1 '61854a2cf08a1398577f74fea191a749bec3e72d' => :mountain_lion
     sha1 'fbe7b85a50f4b283ad55be020c7ddfbf655435ad' => :lion
@@ -31,7 +19,6 @@ class Llvm < Formula
 
   option :universal
   option 'with-clang', 'Build Clang C/ObjC/C++ frontend'
-  option 'with-asan', 'Include support for -faddress-sanitizer (from compiler-rt)'
   option 'disable-shared', "Don't build LLVM as a shared library"
   option 'all-targets', 'Build all target backends'
   option 'rtti', 'Build with C++ RTTI'
@@ -50,10 +37,6 @@ class Llvm < Formula
       clang_dir.install Dir['*']
     end if build.include? 'with-clang'
 
-    CompilerRt.new("compiler-rt").brew do
-      (buildpath/'projects/compiler-rt').install Dir['*']
-    end if build.include? 'with-asan'
-
     if build.universal?
       ENV['UNIVERSAL'] = '1'
       ENV['UNIVERSAL_ARCH'] = Hardware::CPU.universal_archs.join(' ')
@@ -79,22 +62,24 @@ class Llvm < Formula
     args << "--disable-assertions" if build.include? 'disable-assertions'
 
     system "./configure", *args
-    system "make install"
+    system 'make', 'VERBOSE=1'
+    system 'make', 'VERBOSE=1', 'install'
 
     # install llvm python bindings
     if python
-      unless build.head?
-        inreplace buildpath/'bindings/python/llvm/common.py', 'LLVM-3.1svn', "libLLVM-#{version}svn"
-      end
       python.site_packages.install buildpath/'bindings/python/llvm'
     end
 
-    # install clang tools and bindings
+    # Install clang tools and bindings
     cd clang_dir do
-      system 'make install'
       (share/'clang/tools').install 'tools/scan-build', 'tools/scan-view'
       python.site_packages.install 'bindings/python/clang' if python
     end if build.include? 'with-clang'
+
+    # Remove all binaries except llvm-config
+    Dir[bin/'*'].each do |exec_path|
+      rm_f exec_path unless File.basename(exec_path) == 'llvm-config'
+    end
   end
 
   def test
@@ -105,6 +90,13 @@ class Llvm < Formula
     s = ''
     s += python.standard_caveats if python
     s += <<-EOS.undent
+      This formula only provide library components of LLVM. To use full
+      featured LLVM please try the llvm3* formulae in homebrew-versions tap,
+      for instance:
+
+          brew tap homebrew/versions
+          brew install llvm33
+
       Extra tools are installed in #{share}/llvm and #{share}/clang.
 
       If you already have LLVM installed, then "brew upgrade llvm" might not work.