build kokkos internally along with the package

CMakeLists.txt

@@ -110,6 +110,22 @@ else()
   endif()
 endif()
 
+include(FetchContent)
+# configure kokkos 4.4 repository link
+FetchContent_Declare(kokkos
+        URL https://github.com/kokkos/kokkos/releases/download/4.4.01/kokkos-4.4.01.tar.gz
+        URL_HASH MD5=eafd0d42c9831858aa84fde78576644c
+)
+
+# disable build of C++23 mdspan experimental support for now        
+set(Kokkos_ENABLE_IMPL_MDSPAN OFF CACHE BOOL "Experimental mdspan support")
+
+# by default, build the Kokkos serial backend for CPU
+set(Kokkos_ENABLE_SERIAL ON CACHE BOOL "Kokkos Serial backend")
+set(Kokkos_ARCH_NATIVE ON CACHE BOOL "Kokkos native architecture optimisations")
+
+FetchContent_MakeAvailable(kokkos)
+
 add_subdirectory(src)
 
 # Allow for 'make test' even if the tests are disabled:

src/support/CMakeLists.txt

@@ -57,9 +57,6 @@ if(IM_ENABLE_OPENACC)
   endif()
 endif()
 
-message(STATUS "iconmath-support enabling Kokkos")
-find_package(Kokkos REQUIRED)
-
 target_include_directories(
   iconmath-support
   PUBLIC
@@ -77,7 +74,12 @@ target_include_directories(
     # https://cmake.org/cmake/help/latest/manual/cmake-generator-expressions.7.html
     $<BUILD_INTERFACE:$<$<COMPILE_LANGUAGE:C,CXX>:${CMAKE_CURRENT_BINARY_DIR}>>)
 
-target_link_libraries(iconmath-support PUBLIC fortran-support::fortran-support Kokkos::kokkos)
+target_link_libraries(iconmath-support
+    PUBLIC
+        fortran-support::fortran-support
+    PRIVATE
+        Kokkos::kokkos
+)
 
 install(TARGETS iconmath-support EXPORT "${PROJECT_NAME}-targets")