hdf5: Add enable-parallel option

Closes Homebrew/homebrew#17498.
Closes Homebrew/homebrew#16393.
Closes Homebrew/homebrew#17244.

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

Formula/hdf5.rb

@@ -5,12 +5,15 @@ class Hdf5 < Formula
   url 'http://www.hdfgroup.org/ftp/HDF5/releases/hdf5-1.8.9/src/hdf5-1.8.9.tar.bz2'
   sha1 '7d5e5e8caa5970c65e70a5b4ad6787efe0bf70bb'
 
-  depends_on 'szip'
-
   # TODO - warn that these options conflict
   option :universal
   option 'enable-fortran', 'Compile Fortran bindings'
+  option 'enable-cxx', 'Compile C++ bindings'
   option 'enable-threadsafe', 'Trade performance and C++ or Fortran support for thread safety'
+  option 'enable-parallel', 'Compile parallel bindings'
+
+  depends_on 'szip'
+  depends_on MPIDependency.new(:cc, :cxx, :f90) if build.include? "enable-parallel"
 
   def install
     ENV.universal_binary if build.universal?
@@ -26,16 +29,23 @@ class Hdf5 < Formula
       --enable-shared=yes
     ]
 
+    args << '--enable-parallel' if build.include? 'enable-parallel'
     if build.include? 'enable-threadsafe'
       args.concat %w[--with-pthread=/usr --enable-threadsafe]
     else
-      args << '--enable-cxx'
+      if build.include? 'enable-cxx'
+        args << '--enable-cxx'
+      end
       if build.include? 'enable-fortran'
         args << '--enable-fortran'
         ENV.fortran
       end
     end
 
+    if build.include? 'enable-parallel'
+      ENV['CC'] = 'mpicc'
+      ENV['FC'] = 'mpif90'
+    end
     system "./configure", *args
     system "make install"
   end