xsbench: update version and add cuda support (#34597)

* Update xsbench to version 20

XSBench version 20 has implementations for new
architectures and accelerators.

* Added CUDA support for XSBench

* Fixed style issues

1 files changed, 14 insertions, 2 deletions

diff --git a/var/spack/repos/builtin/packages/xsbench/package.py b/var/spack/repos/builtin/packages/xsbench/package.py
index 5edd363a23..fea28cf7bd 100644
--- a/var/spack/repos/builtin/packages/xsbench/package.py
+++ b/var/spack/repos/builtin/packages/xsbench/package.py
@@ -7,7 +7,7 @@
 from spack.package import *
 
 
-class Xsbench(MakefilePackage):
+class Xsbench(MakefilePackage, CudaPackage):
     """XSBench is a mini-app representing a key computational
     kernel of the Monte Carlo neutronics application OpenMC.
     A full explanation of the theory and purpose of XSBench
@@ -18,6 +18,7 @@ class Xsbench(MakefilePackage):
 
     tags = ["proxy-app", "ecp-proxy-app"]
 
+    version("20", sha256="3430328267432b4c29605f248809caec3e8b0e3442d4dcd672fa09b8bb9aa1b6")
     version("19", sha256="57cc44ae3b0a50d33fab6dd48da13368720d2aa1b91cde47d51da78bf656b97e")
     version("18", sha256="a9a544eeacd1be8d687080d2df4eeb701c04eda31d3806e7c3ea1ff36c26f4b0")
     version("14", sha256="595afbcba8c1079067d5d17eedcb4ab0c1d115f83fd6f8c3de01d74b23015e2d")
@@ -25,22 +26,33 @@ class Xsbench(MakefilePackage):
 
     variant("mpi", default=True, description="Build with MPI support")
     variant("openmp", default=True, description="Build with OpenMP support")
+    variant("cuda", default=False, when="@19:", description="Build with CUDA support")
 
     depends_on("mpi", when="+mpi")
 
+    conflicts("cuda_arch=none", when="+cuda", msg="Must select a CUDA architecture")
+    conflicts("+cuda", when="+openmp", msg="OpenMP must be disabled to support CUDA")
+
     @property
     def build_directory(self):
         if self.spec.satisfies("@:18"):
             return "src"
-        else:
+
+        if "+openmp" in self.spec:
             return "openmp-threading"
 
+        if "+cuda" in self.spec:
+            return "cuda"
+
     @property
     def build_targets(self):
 
         targets = []
         cflags = ""
 
+        if "+cuda" in self.spec:
+            return ["SM_VERSION={0}".format(self.spec.variants["cuda_arch"].value[0])]
+
         if not self.spec.satisfies("%nvhpc@:20.11"):
             cflags = "-std=gnu99"