new package: nccl-tests (#15890)

* new package: nccl-tests

* fix dependency types

var/spack/repos/builtin/packages/nccl-tests/package.py

@@ -0,0 +1,36 @@
+# Copyright 2013-2020 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)
+
+
+class NcclTests(MakefilePackage, CudaPackage):
+    """These tests check both the performance and
+       the correctness of NCCL operations."""
+
+    homepage = "https://github.com/NVIDIA/nccl-tests"
+    url      = "https://github.com/NVIDIA/nccl-tests/archive/v2.0.0.tar.gz"
+
+    version('2.0.0', sha256='731fc3b7c37de59cfe880bf198349ac185639ef23570749ea6aef334c850c49c')
+
+    variant('mpi', default=True, description='with MPI support')
+    variant('cuda', default=True, description='with CUDA support, must be true')
+    conflicts('~cuda', msg='nccl-tests require cuda')
+
+    depends_on('nccl')
+    depends_on('cuda')
+    depends_on('mpi', when='+mpi')
+
+    @property
+    def build_targets(self):
+        targets = []
+        targets.append('CUDA_HOME={0}'.format(self.spec['cuda'].prefix))
+        targets.append('NCCL_HOME={0}'.format(self.spec['nccl'].prefix))
+        if '+mpi' in self.spec:
+            targets.append('MPI_HOME={0}'.format(self.spec['mpi'].prefix))
+            targets.append('MPI=1')
+        return targets
+
+    def install(self, spec, prefix):
+        mkdirp(prefix.bin)
+        install_tree('./build', prefix.bin)