package: Add powerapi package (spack#11845)

* Add powerapi package

* Fix flake8 formatting

* Fix download URL

* Update powerapi version line

* Fix how configure arguments are selected to improve readability

* Bug Fixes

* Fix trailing whitespace

* Bug fixes

* Remove incorrect configure flag

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

@@ -0,0 +1,51 @@
+# 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 Powerapi(AutotoolsPackage):
+    """This software is a reference implementation of the PowerAPI"""
+
+    homepage = "https://powerapi.sandia.gov/"
+    git      = "https://github.com/pwrapi/pwrapi-ref.git"
+
+    version('1.1.1', commit='93f66dfa29f014067823f2b790a1862e5841a11c')
+
+    variant('hwloc', default=False, description='Build hwloc support')
+    variant('debug', default=False, description='Enable debug support')
+    variant('mpi',   default=False, description='Enable MPI support')
+    variant('gnu-ld', default=False, description='Assume GNU compiled uses gnu-ld')
+
+    depends_on('autoconf')
+    depends_on('automake')
+    depends_on('libtool')
+    depends_on('m4')
+
+    depends_on('hwloc', when='+hwloc')
+    depends_on('mpi', when='+mpi')
+
+    def autoreconf(self, spec, prefix):
+        bash = which('bash')
+        bash('./autogen.sh')
+
+    def configure_args(self):
+        spec = self.spec
+        args = ['--prefix={0}'.format(self.prefix)]
+
+        if '+hwloc' in spec:
+            args.append('--with-hwloc={0}'.format(spec['hwloc'].prefix))
+
+        if '+mpi' in spec:
+            args.append('--with-mpi={0}'.format(spec['mpi'].prefix))
+
+        args.extend([
+            '--with%s-gnu-ld' % ('' if '+gnu-ld' in spec else 'out'),
+            '--%sable-debug' % ('en' if '+debug' in spec else 'dis')
+        ])
+
+        return args
+
+    def install(self, spec, prefix):
+        make('install')