[build] Add spack package

Author: muffgaga

spack/include_path.patch

@@ -0,0 +1,13 @@
+diff --git i/userproject/include/generateRun.h w/userproject/include/generateRun.h
+index 84fd3525a..14994563c 100644
+--- i/userproject/include/generateRun.h
++++ w/userproject/include/generateRun.h
+@@ -17,7 +17,7 @@
+ #endif
+ 
+ // CLI11 includes
+-#include "../../include/genn/third_party/CLI11.hpp"
++#include "genn/third_party/CLI11.hpp"
+ 
+ //------------------------------------------------------------------------
+ // GenerateRunBase

spack/package.py

@@ -0,0 +1,55 @@
+# Copyright 2013-2021 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 Genn(PythonPackage):
+    """GeNN is a GPU-enhanced Neuronal Network simulation environment based on
+    code generation for Nvidia CUDA."""
+
+    homepage = "https://genn-team.github.io/genn/"
+    url      = "https://github.com/genn-team/genn/archive/refs/tags/4.6.0.tar.gz"
+
+    version('4.6.0', sha256='5e5ca94fd3a56b5b963a4911ea1b2130df6fa7dcdde3b025bd8cb85d4c2d3236')
+
+    conflicts('%gcc@:4.9.3')
+    depends_on('gmake', type='build')
+
+    variant('cuda', default=True, description='Enable CUDA support')
+    depends_on('cuda', when='+cuda')
+
+    variant('python', default=True, description='Enable PyGeNN')
+    extends('python', when='+python')
+    depends_on('[email protected]:',                when='+python')
+    depends_on('[email protected]:',             when='+python')
+    depends_on('py-six',                       when='+python')
+    depends_on('py-deprecated',                when='+python')
+    depends_on('py-psutil',                    when='+python')
+    depends_on('[email protected]:', when='+python')
+    depends_on('swig',                         when='+python')
+
+    patch('include_path.patch')
+
+    def build(self, spec, prefix):
+        make('PREFIX={}'.format(prefix), 'install')
+        if '+python' in self.spec:
+            make('DYNAMIC=1', 'LIBRARY_DIRECTORY={}/pygenn/genn_wrapper/'.format(self.stage.source_path))
+            super(Genn, self).build(spec, prefix)
+
+    def install(self, spec, prefix):
+        install_tree('bin', prefix.bin)
+        install_tree('include', prefix.include)
+        mkdirp(prefix.src.genn)
+        install_tree('src/genn', prefix.src.genn)
+        if '+python' in self.spec:
+            super(Genn, self).install(spec, prefix)
+
+    def setup_run_environment(self, env):
+        env.append_path('CPLUS_INCLUDE_PATH', self.prefix.include)
+        if '+cuda' in self.spec:
+            env.append_path('CUDA_PATH', self.spec['cuda'].prefix)
+        if '+python' in self.spec:
+            super(Genn, self).setup_run_environment(env)