libecpint: initial add (#21353)

* libecpint: initial add

* flake8

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

@@ -0,0 +1,30 @@
+# 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 Libecpint(CMakePackage):
+    """A C++ library for the efficient evaluation of integrals over effective core
+    potentials.
+    """
+
+    homepage = "https://github.com/robashaw/libecpint"
+    url      = "https://github.com/robashaw/libecpint/archive/v1.0.4.tar.gz"
+    git      = "https://github.com/robashaw/libecpint"
+
+    version('master', branch='master')
+    version('1.0.4', sha256='fad9d1ac98f8dcd40f7bee69aef653bfa3079f016e43277cbd554e06890aa186')
+    version('1.0.3', sha256='13c3f7d1cf35355e37a903196d5cace60f6a72ae041e8b3502dfabdd19dde17a')
+    version('1.0.2', sha256='2fb73af4d30a40bdd9df9e04b1f762c38ab7ed3a39c11509f3f87250fe0b5778')
+    version('1.0.1', sha256='245b89fe8cb0a92cbbb79c811b48cb15fcfc937389df89387466f1bf76a096bf')
+    version('1.0.0', sha256='47d741cc48a543ef9c85483cb2d5cd1c9f6677fa7e9920886d083b3c25232379')
+
+    depends_on('pugixml')
+    depends_on('googletest')
+
+    def cmake_args(self):
+        args = ['-DBUILD_SHARED_LIBS=ON']
+        return args