raja: add awareness of the cuda architecture (#16377)

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

@@ -6,7 +6,7 @@
 from spack import *
 
 
-class Raja(CMakePackage):
+class Raja(CMakePackage, CudaPackage):
     """RAJA Parallel Framework."""
 
     homepage = "http://software.llnl.gov/RAJA/"
@@ -47,4 +47,9 @@ def cmake_args(self):
                 '-DENABLE_CUDA=On',
                 '-DCUDA_TOOLKIT_ROOT_DIR=%s' % (spec['cuda'].prefix)])
 
+            cuda_value = spec.variants['cuda_arch'].value
+            cuda_arch = cuda_value[0]
+            if cuda_arch is not None:
+                options.append('-DCUDA_ARCH=sm_{0}'.format(cuda_arch))
+
         return options