mpich2: cleanup, rename to mpich

* mpich2 -> mpich
* remove slurm dependency
* use most recent gfortran
* turn enableParallelBulding on
* ensure mpi[cc,cxx,fort] uses default compilers it was built with

pkgs/development/libraries/mpich/default.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchurl, perl, gfortran
-, slurm, openssh, hwloc
+,  openssh, hwloc
 } :
 
 stdenv.mkDerivation  rec {
@@ -16,7 +16,9 @@ stdenv.mkDerivation  rec {
     "--enable-sharedlib"
   ];
 
-  buildInputs = [ perl gfortran slurm openssh hwloc ];
+  enableParallelBuilding = true;
+
+  buildInputs = [ perl gfortran openssh hwloc ];
 
   doCheck = true;
 
@@ -26,8 +28,12 @@ stdenv.mkDerivation  rec {
       echo "fix rpath: $entry"
       patchelf --set-rpath "$out/lib" $entry
     done
-  '';
 
+    # Ensure the default compilers are the ones mpich was built with
+    sed -i 's:CC="gcc":CC=${stdenv.cc}/bin/gcc:' $out/bin/mpicc
+    sed -i 's:CXX="g++":CXX=${stdenv.cc}/bin/g++:' $out/bin/mpicxx
+    sed -i 's:FC="gfortran":FC=${gfortran}/bin/gfortran:' $out/bin/mpifort
+  '';
 
   meta = with stdenv.lib; {
     description = "Implementation of the Message Passing Interface (MPI) standard";

pkgs/top-level/aliases.nix

@@ -171,6 +171,7 @@ mapAliases ({
   mlt-qt5 = libsForQt5.mlt;  # added 2015-12-19
   mobile_broadband_provider_info = mobile-broadband-provider-info; # added 2018-02-25
   module_init_tools = kmod; # added 2016-04-22
+  mpich2 = mpich;  # added 2018-08-06
   msf = metasploit; # added 2018-04-25
   mssys = ms-sys; # added 2015-12-13
   multipath_tools = multipath-tools;  # added 2016-01-21

pkgs/top-level/all-packages.nix

@@ -11071,9 +11071,7 @@ with pkgs;
 
   libmpc = callPackage ../development/libraries/libmpc { };
 
-  mpich2 = callPackage ../development/libraries/mpich2 {
-    gfortran = gfortran5;
-  };
+  mpich = callPackage ../development/libraries/mpich { };
 
   mstpd = callPackage ../os-specific/linux/mstpd { };