Merge topic 'FindMPI-nvcc-link-pthread' into release-3.18

33192e1b FindMPI: Pass -pthread to NVCC through -Xlinker for device linking

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !4981

Modules/FindMPI.cmake

@@ -1164,6 +1164,8 @@ macro(_MPI_create_imported_target LANG)
   set_property(TARGET MPI::MPI_${LANG} PROPERTY INTERFACE_COMPILE_DEFINITIONS "${MPI_${LANG}_COMPILE_DEFINITIONS}")
 
   if(MPI_${LANG}_LINK_FLAGS)
+    string(REPLACE "-pthread" "$<$<LINK_LANG_AND_ID:CUDA,NVIDIA>:-Xlinker >-pthread"
+      _MPI_${LANG}_LINK_FLAGS "${MPI_${LANG}_LINK_FLAGS}")
     set_property(TARGET MPI::MPI_${LANG} PROPERTY INTERFACE_LINK_OPTIONS "SHELL:${MPI_${LANG}_LINK_FLAGS}")
   endif()
   # If the compiler links MPI implicitly, no libraries will be found as they're contained within