Merge pull request #5793 from kjetilly/opencl_optional

Make OpenCL optional

CMakeLists.txt

@@ -37,6 +37,7 @@ option(USE_TRACY_PROFILER "Enable tracy profiling" OFF)
 option(CONVERT_CUDA_TO_HIP "Convert CUDA code to HIP (to run on AMD cards)" OFF)
 option(USE_HYPRE "Use the Hypre library for linear solvers?" OFF)
 set(OPM_COMPILE_COMPONENTS "2;3;4;5;6;7" CACHE STRING "The components to compile support for")
+option(USE_OPENCL "Enable OpenCL support?" ON)
 
 # Ensure OPM_COMPILE_COMPONENTS is a list of at least one element
 if(OPM_COMPILE_COMPONENTS STREQUAL "")
@@ -222,9 +223,10 @@ if(CUDA_FOUND)
   endif()
 endif()
 
-find_package(OpenCL)
+if (USE_OPENCL)
+  find_package(OpenCL)
 
-if(OpenCL_FOUND)
+  if(OpenCL_FOUND)
     # the current OpenCL implementation relies on cl2.hpp, not cl.hpp
     # make sure it is available, otherwise disable OpenCL
     find_file(CL2_HPP CL/cl2.hpp HINTS ${OpenCL_INCLUDE_DIRS})
@@ -254,10 +256,11 @@ if(OpenCL_FOUND)
         add_compile_options(-DCHOW_PATEL_GPU_PARALLEL=0)
       endif()
     endif()
-else()
+  else()
     if(USE_CHOW_PATEL_ILU)
       message(FATAL_ERROR " CHOW_PATEL_ILU only works for openclSolver, but OpenCL was not found")
     endif()
+  endif()
 endif()
 
 find_package(amgcl)