Adding Cuda Variant to SW4Lite (#18590)

* Adding Cuda Variant to SW4Lite

Added cuda variant of sw4lite  as per guidance in README

* Updated SW4Lite+cuda to Current Header Conventions

Updated sw4lite+cuda to use current conventions for spackage include
dirs

* Fixing FLake8 Issue with Sw4lite+cuda Fix

Fixed overly long line and further underlined sticky note reminding me
to run flake8 BEFORE pushing

* Switching to Spack Compiler Wrapper

Switching to spack compiler wrapper for consistency

var/spack/repos/builtin/packages/sw4lite/package.py

@@ -4,7 +4,7 @@
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
 
-class Sw4lite(MakefilePackage):
+class Sw4lite(MakefilePackage, CudaPackage):
     """Sw4lite is a bare bone version of SW4 intended for testing
     performance optimizations in a few important numerical kernels of SW4."""
 
@@ -52,6 +52,15 @@ def build_targets(self):
             cxxflags.append('-DSW4_CROUTINES')
             targets.append('ckernel=yes')
 
+        if '+cuda' in self.spec:
+            targets.append('NVCC = {0}'.format(
+                self.spec['cuda'].prefix.bin.nvcc))
+            targets.append('HOSTCOMP = {0}'.format(spack_cxx))
+            targets.append('MPIPATH= {0} '.format(self.spec['mpi'].prefix))
+            targets.append('gpuarch= {0}'.format(self.cuda_flags(cuda_arch)))
+            targets.append('MPIINC = {0}'.format(
+                self.spec['mpi'].headers.directories[0]))
+
         targets.append('FC=' + spec['mpi'].mpifc)
         targets.append('CXX=' + spec['mpi'].mpicxx)
 
@@ -70,6 +79,12 @@ def build_targets(self):
 
         return targets
 
+    def build(self, spec, prefix):
+        if '+cuda' in spec:
+            make('-f', 'Makefile.cuda')
+        else:
+            make('-f', 'Makefile')
+
     def install(self, spec, prefix):
         mkdir(prefix.bin)
         install('*/sw4lite', prefix.bin)