Refactor HDF5 formula

Some changes to the way HDF5 is configured:

  * The SZIP dependency is actually used
  * C++ bindings are compiled by default as it requires no additional
    dependencies.

New formula options:

  * Build Fortran bindings although this disables the production of shared
    libraries.
  * Build a threadsafe HDF5 library, although this disables C++ and Fortran
    bindings and causes a performance hit.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/hdf5.rb

@@ -1,5 +1,13 @@
 require 'formula'
 
+def fortran?
+  ARGV.include? '--enable-fortran'
+end
+
+def threadsafe?
+  ARGV.include? '--enable-threadsafe'
+end
+
 class Hdf5 < Formula
   url 'http://www.hdfgroup.org/ftp/HDF5/current/src/hdf5-1.8.6.tar.bz2'
   homepage 'http://www.hdfgroup.org/HDF5/'
@@ -8,8 +16,30 @@ class Hdf5 < Formula
 
   depends_on 'szip'
 
+  def options
+    [
+      ['--enable-fortran', 'Compile Fortran bindings at the expense of having shared libraries'],
+      ['--enable-threadsafe', 'Trade performance and C++ or Fortran support for thread safety']
+    ]
+  end
+
   def install
-    system "./configure", "--prefix=#{prefix}", "--disable-debug", "--disable-dependency-tracking"
+    ENV.fortran if fortran?
+
+    args = [
+      "--prefix=#{prefix}",
+      '--disable-debug',
+      '--disable-dependency-tracking',
+      '--enable-production',
+      '--with-zlib=yes',
+      '--with-szlib=yes',
+      '--enable-filters=all'
+    ]
+    args.concat ['--with-pthread=/usr', '--enable-threadsafe'] if threadsafe?
+    args << '--enable-cxx' unless threadsafe?
+    args << '--enable-fortran' if fortran? and not threadsafe?
+
+    system "./configure", *args
     system "make install"
   end
 end