windows-cmake: make explicit options for libxml2,cuda,opencl

Signed-off-by: Michael Hirsch <michael@scivision.dev>

contrib/windows-cmake/CMakeLists.txt

@@ -9,6 +9,11 @@ option(HWLOC_ENABLE_TESTING "Enable testing" ON)
 option(HWLOC_SKIP_LSTOPO "don't build/install lstopo")
 option(HWLOC_SKIP_TOOLS "don't build/install other hwloc tools")
 option(HWLOC_SKIP_INCLUDES "don't install headers")
+option(HWLOC_WITH_LIBXML2 "use libxml2 instead of minimal XML")
+option(HWLOC_WITH_OPENCL "enable OpenCL support")
+if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.17)
+    option(HWLOC_WITH_CUDA "enable CUDA support")
+endif()
 
 set(TOPDIR ${PROJECT_SOURCE_DIR}/../..)
 
@@ -65,31 +70,29 @@ HWLOC_HAVE_MSVC_CPUIDEX
 #   set(HAVE_DECL_STRTOULL 1)
 
 # --- optional external libraries
-find_package(LibXml2)
 set(HWLOC_HAVE_LIBXML2)
-if(LibXml2_FOUND)
+if(HWLOC_WITH_LIBXML2)
+    find_package(LibXml2 REQUIRED)
     set(HWLOC_HAVE_LIBXML2 1)
 endif()
 
-find_package(OpenCL)
 set(HWLOC_HAVE_OPENCL)
-if(OpenCL_FOUND)
+if(HWLOC_WITH_OPENCL)
+    find_package(OpenCL REQUIRED)
     set(HWLOC_HAVE_OPENCL 1)
 endif()
 
 set(HAVE_CUDA)
 set(HAVE_CUDA_H)
 set(HAVE_CUDA_RUNTIME_API_H)
 set(HWLOC_HAVE_CUDART)
-if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.17)
-find_package(CUDAToolkit)
-if(CUDAToolkit_FOUND)
+if(HWLOC_WITH_CUDA)
+    find_package(CUDAToolkit REQUIRED)
     set(HAVE_CUDA 1)
     set(HAVE_CUDA_H 1)
     set(HAVE_CUDA_RUNTIME_API_H 1)
     set(HWLOC_HAVE_CUDART 1)
 endif()
-endif()
 
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/private_config.h.in include/private/autogen/config.h)
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/static-components.h.in include/static-components.h)