lbann: add aluminum dependency (#9523)

* Added support for the Aluminum library to LBANN and Hydrogen. Also
  fixed several bugs in the grouping of dependencies of both packages.
* Updated the conduit package to have the proper dependency on the
  python variant.
* Added new versions for NCCL
* Fixed a bug in how Hydrogen set the path for OpenBLAS.
* Added support for conduit in LBANN.

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

@@ -0,0 +1,43 @@
+# Copyright 2013-2018 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class Aluminum(CMakePackage):
+    """Aluminum provides a generic interface to high-performance
+    communication libraries, with a focus on allreduce
+    algorithms. Blocking and non-blocking algorithms and GPU-aware
+    algorithms are supported. Aluminum also contains custom
+    implementations of select algorithms to optimize for certain
+    situations."""
+
+    homepage = "https://github.com/LLNL/Aluminum"
+    url      = "https://github.com/LLNL/Aluminum/archive/v0.1.tar.gz"
+    git      = "https://github.com/LLNL/Aluminum.git"
+
+    version('master', branch='master')
+    version('0.1', sha256='3880b736866e439dd94e6a61eeeb5bb2abccebbac82b82d52033bc6c94950bdb')
+
+    variant('gpu', default=False, description='Builds with support for GPUs via CUDA and cuDNN')
+    variant('nccl', default=False, description='Builds with support for NCCL communication lib')
+    variant('mpi_cuda', default=False, description='Builds with support for MPI-CUDA enabled library')
+
+    depends_on('cmake@3.9.0:', type='build')
+    depends_on('cuda', when='+gpu')
+    depends_on('cudnn', when='+gpu')
+    depends_on('cub', when='+gpu')
+    depends_on('mpi', when='~mpi_cuda')
+    depends_on('mpi +cuda', when='+mpi_cuda')
+    depends_on('nccl', when='+nccl')
+    depends_on('hwloc')
+
+    def cmake_args(self):
+        spec = self.spec
+        args = [
+            '-DALUMINUM_ENABLE_CUDA:BOOL=%s' % ('+gpu' in spec),
+            '-DALUMINUM_ENABLE_MPI_CUDA:BOOL=%s' % ('+mpi_cuda' in spec),
+            '-DALUMINUM_ENABLE_NCCL:BOOL=%s' % ('+nccl' in spec)]
+        return args