Add new package arbor (#11914)

* Add new package arbor

Change-Id: I70a442d6ad74979d13bd9f599df238c085d4baf9

* Update package.py

* add additional dependencies

* change download to tar-ball

* py26 compatibility

* restrict noqas and expand comment

Co-authored-by: Eric Müller <mueller@kip.uni-heidelberg.de>

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

@@ -0,0 +1,70 @@
+# Copyright 2013-2019 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 Arbor(CMakePackage):
+    """Arbor is a high-performance library for computational neuroscience
+    simulations."""
+
+    homepage = "https://github.com/arbor-sim/arbor/"
+    url      = "https://github.com/arbor-sim/arbor/archive/v0.2.tar.gz"
+
+    version('0.2', sha256='43c9181c03be5f3c9820b2b50592d7b41344f37e1200980119ad347eb7bcf4eb')
+
+    variant('vectorize', default=False,
+            description='Enable vectorization of computational kernels')
+    variant('gpu', default=False, description='Enable GPU support')
+    variant('mpi', default=False, description='Enable MPI support')
+    variant('python', default=False,
+            description='Enable Python frontend support')
+    variant('unwind', default=False,
+            description='Enable libunwind for pretty stack traces')
+
+    depends_on('cuda', when='+gpu')
+    depends_on('mpi', when='+mpi')
+    depends_on('libunwind', when='+unwind')
+
+    extends('python@3.6:', when='+python')
+    depends_on('py-mpi4py', when='+mpi+python', type=('build', 'run'))
+
+    depends_on('cmake@3.9:', type='build')
+    # mentioned in documentation but shouldn't be necessary when
+    # using the archive
+    # depends_on('git@2.0:', type='build')
+
+    # compiler dependencies
+    # depends_on(C++14)
+    # depends_on('gcc@6.1.0:', type='build')
+    # depends_on('llvm@4:', type='build')
+    # depends_on('clang-apple@9:', type='build')
+
+    # when building documentation, this could be an optional dependency
+    depends_on('py-sphinx', type='build')
+
+    def patch(self):
+        filter_file(
+            r'find_library\(_unwind_library_target unwind-\${libunwind_arch}',
+            r'find_library(_unwind_library_target unwind-${_libunwind_arch}',
+            'cmake/FindUnwind.cmake'
+        )
+        filter_file(
+            r'target_compile_definitions\(arbor-private-deps ARB_WITH_UNWIND\)',      # noqa: E501
+            r'target_compile_definitions(arbor-private-deps INTERFACE WITH_UNWIND)',  # noqa: E501
+            'CMakeLists.txt'
+        )
+
+    def cmake_args(self):
+        args = [
+            '-DARB_VECTORIZE=' + ('ON' if '+vectorize' in self.spec else 'OFF'),      # noqa: E501
+            '-DARB_WITH_GPU=' + ('ON' if '+gpu' in self.spec else 'OFF'),
+            '-DARB_WITH_PYTHON=' + ('ON' if '+python' in self.spec else 'OFF'),
+        ]
+
+        if '+unwind' in self.spec:
+            args.append('-DUnwind_ROOT_DIR={0}'.format(self.spec['libunwind'].prefix))  # noqa: E501
+
+        return args