HDF5-vol-async: add "memcpy" variant (#36013)

var/spack/repos/builtin/packages/hdf5-vol-async/package.py

@@ -24,6 +24,8 @@ class Hdf5VolAsync(CMakePackage):
     version("1.1", tag="v1.1")
     version("1.0", tag="v1.0")
 
+    variant("memcpy", default=False, description="Enable buffer copy for dataset write")
+
     depends_on("mpi")
     depends_on("argobots@main")
     depends_on("hdf5 +mpi +threadsafe")
@@ -42,6 +44,7 @@ def cmake_args(self):
             self.define("CMAKE_C_COMPILER", self.spec["mpi"].mpicc),
             self.define("BUILD_SHARED_LIBS", True),
             self.define("BUILD_TESTING", self.run_tests),
+            self.define_from_variant("ENABLE_WRITE_MEMCPY", "memcpy"),
         ]
         return args