add pmi support and process managers to the MPIs

var/spack/repos/builtin/packages/openmpi/package.py

@@ -26,6 +26,7 @@ class Openmpi(Package):
     patch('configure.patch', when="@1.10.0:1.10.1")
 
     variant('psm', default=False, description='Build support for the PSM library.')
+    variant('pmi', default=True, description='Build support for PMI-based launchers')
     variant('verbs', default=False, description='Build support for OpenFabrics verbs.')
 
     # TODO : variant support for other schedulers is missing
@@ -67,6 +68,9 @@ def install(self, spec, prefix):
         if '+psm' in spec:
             config_args.append("--with-psm")
 
+        if '+pmi' in spec:
+            config_args.append("--with-pmi") #TODO: let user specify directory when possible
+
         if '+verbs' in spec:
             # Up through version 1.6, this option was previously named --with-openib
             if spec.satisfies('@:1.6'):