Add mercurium mcxx compiler

bsc/mcxx/default.nix

@@ -0,0 +1,54 @@
+{ stdenv
+, fetchgit
+, autoreconfHook
+, nanos6
+, gperf
+, python
+, gfortran
+, pkg-config
+, sqlite
+, flex
+, bison
+, gcc
+}:
+
+stdenv.mkDerivation rec {
+  name = "mcxx";
+  #version attribute ignored when using fetchgit:
+  #version = "2.2.0-70a299cf";
+
+  # Use patched Extrae version
+  src = fetchgit {
+    url = "https://github.com/bsc-pm/mcxx";
+    rev = "70a299cfeb1f96735e6b9835aee946451f1913b2";
+    sha256 = "1n8y0h47jm2ll67xbz930372xkl9647z12lfwz2472j3y86yxpmw";
+  };
+
+  enableParallelBuilding = true;
+
+  # Use full path for the backend compilers
+  preConfigure = ''
+    export GCC=${gcc}/bin/gcc
+    export GXX=${gcc}/bin/g++
+    export GFORTRAN=${gfortran}/bin/gfortran
+  '';
+
+  buildInputs = [
+    autoreconfHook
+    nanos6
+    gperf
+    python
+    gfortran
+    pkg-config
+    sqlite.dev
+    bison
+    flex
+    gcc
+  ];
+
+  configureFlags = [
+    "--enable-ompss-2"
+    "--with-nanos6=${nanos6}"
+  ];
+    
+}