mednafen: add devel

Also add an option to build the unstable new PlayStation emulator (only
available in the 0.9 branch)

Closes Homebrew/homebrew#7550.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>

Formula/mednafen.rb

@@ -6,19 +6,42 @@ class Mednafen < Formula
   md5 '57d22805071becd81858b0c088a275e5'
   version '0.8.D.3'
 
+  devel do
+    url 'http://forum.fobby.net/index.php?t=getfile&id=304'
+    md5 '0327b3b0f8413f1ed446c4d8b9b897f0'
+    version '0.9.18-WIP'
+  end
+
   depends_on 'pkg-config' => :build
   depends_on 'sdl'
   depends_on 'sdl_net'
   depends_on 'libcdio'
   depends_on 'libsndfile'
 
+  def options
+    [
+      ["--with-psx", "Build experimental PlayStation emulator"]
+    ]
+  end
+
   def install
-    # someone with more C++ juice than me can undertake to patch the
-    # crasher in Blip_Synth<8, 1>::offset_resampled that happens with
-    # even minimal optimizations turned on (in LLVM or GCC 4.2)
+    # Compiler produces code which fails math tests
+    # with optimizations enabled
+    # http://forum.fobby.net/index.php?t=msg&&th=659&goto=2254#msg_2254
     ENV.no_optimization
 
-    system "./configure", "--disable-dependency-tracking", "--prefix=#{prefix}"
+    args = [ "--disable-dependency-tracking", "--prefix=#{prefix}" ]
+
+    if ARGV.include? "--with-psx" and not ARGV.build_devel?
+      onoe "--with-psx is only supported with --devel" \
+    end
+    args << "--enable-psx" if ARGV.flag? "--with-psx" and ARGV.build_devel?
+
+    # Platform detection is buggy; problem reported upstream:
+    # http://forum.fobby.net/index.php?t=msg&&th=659&goto=2214#msg_2214
+    args << "--build=x86_64-apple-darwin#{`uname -r`}" if MacOS.prefer_64_bit?
+
+    system "./configure", *args
     system "make install"
   end
 end