plsm: new package (#48875)

* Adding plsm package

* [@spackbot] updating style on behalf of PhilipFackler

* Removing redundant text

* Add description

* Add blank line

* Add cuda_arch and update int64 handling

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

@@ -0,0 +1,46 @@
+# Copyright Spack Project Developers. See COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack.package import *
+
+
+class Plsm(CMakePackage, CudaPackage):
+    """plsm is a generic library for spatial subdivision within an N-dimensional lattice."""
+
+    homepage = "https://github.com/ORNL-Fusion/plsm"
+    url = "https://github.com/ORNL-Fusion/plsm/archive/refs/tags/v2.1.2.tar.gz"
+    git = "https://github.com/ORNL-Fusion/plsm.git"
+
+    maintainers("PhilipFackler", "sblondel")
+    license("BSD-3-Clause", checked_by="PhilipFackler")
+
+    version("2.1.2", sha256="0816fc604b35aac9d848063c2cb2e20abef5e39e146d745873a061a9445ec277")
+    version("2.0.4", sha256="a92080c7015d33a11ffd0d790a75341d1b1e3b7d19331fbd48c5e6a15a09693d")
+    version("2.0.3", sha256="d7ca114dd566ee8f1485bcb5e4d9307a43c33f107d295cec31a568b3ad7064bc")
+    version("2.0.1", sha256="b5b60172ee398a08df9d11b04719d85c7c99c6a5b10b3709f72fcd40a920c0c3")
+    version("2.0.0", sha256="833e63134101e1574de383e3d6d50fcee60ef7f9e69394d5b4c722e2a6317017")
+    version("1.1.1", sha256="e40e2d5d3339b303a0056bcec0882b3040e69b38ddef4c3154a6e8ce3d83ebb8")
+
+    depends_on("cxx", type="build")
+
+    variant("int64", default=True, description="Use 64-bit indices")
+    variant("openmp", default=False, description="Activates OpenMP backend")
+
+    conflicts("+cuda", when="cuda_arch=none")
+    conflicts("+openmp", when="+cuda", msg="Can't use both OpenMP and CUDA")
+
+    depends_on("kokkos")
+    depends_on("kokkos +openmp", when="+openmp")
+    for cuda_arch in CudaPackage.cuda_arch_values:
+        depends_on(
+            f"kokkos+cmake_lang+cuda+cuda_lambda cuda_arch={cuda_arch}",
+            when=f"+cuda cuda_arch={cuda_arch}",
+        )
+
+    def cmake_args(self):
+        args = [
+            self.define("BUILD_TESTING", self.run_tests),
+            self.define_from_variant("PLSM_USE_64BIT_INDEX_TYPE", "int64"),
+        ]
+        return args