Remove OpenMP dependencies from CMake

cpp/CMakeLists.txt

@@ -123,15 +123,6 @@ if(NOT USE_CUGRAPH_OPS)
  list(APPEND CUGRAPH_CUDA_FLAGS -DNO_CUGRAPH_OPS)
 endif()
 
-################################################################################
-# - find openmp ----------------------------------------------------------------
-
-find_package(OpenMP)
-if(OpenMP_FOUND)
- # find_package(OPenMP) does not automatically add OpenMP flags to CUDA
- list(APPEND CUGRAPH_CUDA_FLAGS -Xcompiler=${OpenMP_CXX_FLAGS})
-endif()
-
 ###################################################################################################
 # - find CPM based dependencies ------------------------------------------------------------------
 
@@ -328,57 +319,6 @@ else()
  )
 endif()
 
-if(OpenMP_CXX_FOUND)
-target_link_libraries(cugraph PRIVATE
-################################################################################
-### Use ${OpenMP_CXX_LIB_NAMES} instead of OpenMP::OpenMP_CXX to avoid the following warnings.
-###
-### Cannot generate a safe runtime search path for target TARGET_NAME
-### because files in some directories may conflict with libraries in implicit
-### directories:
-### ...
-###
-### libgomp.so is included in the conda base environment and copied to every new conda
-### environment. If a full file path is provided (e.g ${NCCL_LIBRARIES}), cmake
-### extracts the directory path and adds the directory path to BUILD_RPATH (if BUILD_RPATH is not
-### disabled).
-###
-### cmake maintains a system specific implicit directories (e.g. /lib, /lib/x86_64-linux-gnu,
-### /lib32, /lib32/x86_64-linux-gnu, /lib64, /lib64/x86_64-linux-gnu, /usr/lib,
-### /usr/lib/gcc/x86_64-linux-gnu/7, /usr/lib/x86_64-linux-gnu, /usr/lib32,
-### /usr/lib32/x86_64-linux-gnu, /usr/lib64, /usr/lib64/x86_64-linux-gnu,
-### /usr/local/cuda-10.0/lib64", /usr/local/cuda-10.0/lib64/stubs).
-###
-### If a full path to libgomp.so is provided (which is the case with OpenMP::OpenMP_CXX), cmake
-### checks whether there is any other libgomp.so with the different full path (after resolving
-### soft links) in the search paths (implicit directoires + BUILD_RAPTH). There is one in the
-### path included in BUILD_RPATH when ${NCCL_LIBRARIES} are added; this one can
-### potentially hide the one in the provided full path and cmake generates a warning (and RPATH
-### is searched before the directories in /etc/ld.so/conf; ld.so.conf does not coincide but
-### overlaps with implicit directories).
-###
-### If we provide just the library names (gomp;pthread), cmake does not generate warnings (we
-### did not specify which libgomp.so should be loaded in runtime), and the one first found in
-### the search order is loaded (we can change the loaded library by setting LD_LIBRARY_PATH or
-### manually editing BUILD_RPATH).
-###
-### Manually editing BUILD_RPATH:
-### set(TARGET_BUILD_RPATH "")
-### foreach(TMP_VAR_FULLPATH IN LISTS OpenMP_CXX_LIBRARIES)
-### get_filename_component(TMP_VAR_DIR ${TMP_VAR_FULLPATH} DIRECTORY)
-### string(APPEND TARGET_BUILD_RPATH "${TMP_VAR_DIR};")
-### get_filename_component(TMP_VAR_REALPATH ${TMP_VAR_FULLPATH} REALPATH)
-### get_filename_component(TMP_VAR_DIR ${TMP_VAR_REALPATH} DIRECTORY)
-### # cmake automatically removes duplicates, so skip checking.
-### string(APPEND TARGET_BUILD_RPATH "${TMP_VAR_DIR};")
-### endforeach()
-### string(APPEND TARGET_BUILD_RPATH "${CONDA_PREFIX}/lib")
-### message(STATUS "TARGET_BUILD_RPATH=${TARGET_BUILD_RPATH}")
-### set_target_properties(target PROPERTIES
-### BUILD_RPATH "${TARGET_BUILD_RPATH}")
- ${OpenMP_CXX_LIB_NAMES})
-endif()
-
 ################################################################################
 # - C-API library --------------------------------------------------------------
 

cpp/tests/CMakeLists.txt

@@ -81,57 +81,6 @@ function(ConfigureTest CMAKE_TEST_NAME)
  NCCL::NCCL
  )
 
- if(OpenMP_CXX_FOUND)
- target_link_libraries(${CMAKE_TEST_NAME} PRIVATE
-###################################################################################################
-### Use ${OpenMP_CXX_LIB_NAMES} instead of OpenMP::OpenMP_CXX to avoid the following warnings.
-###
-### Cannot generate a safe runtime search path for target TARGET_NAME
-### because files in some directories may conflict with libraries in implicit
-### directories:
-### ...
-###
-### libgomp.so is included in the conda base environment and copied to every new conda
-### environment. If a full file path is provided (e.g ${CUDF_LIBRARY}), cmake
-### extracts the directory path and adds the directory path to BUILD_RPATH (if BUILD_RPATH is not
-### disabled).
-###
-### cmake maintains a system specific implicit directories (e.g. /lib, /lib/x86_64-linux-gnu,
-### /lib32, /lib32/x86_64-linux-gnu, /lib64, /lib64/x86_64-linux-gnu, /usr/lib,
-### /usr/lib/gcc/x86_64-linux-gnu/7, /usr/lib/x86_64-linux-gnu, /usr/lib32,
-### /usr/lib32/x86_64-linux-gnu, /usr/lib64, /usr/lib64/x86_64-linux-gnu,
-### /usr/local/cuda-10.0/lib64", /usr/local/cuda-10.0/lib64/stubs).
-###
-### If a full path to libgomp.so is provided (which is the case with OpenMP::OpenMP_CXX), cmake
-### checks whether there is any other libgomp.so with the different full path (after resolving
-### soft links) in the search paths (implicit directoires + BUILD_RAPTH). There is one in the
-### path included in BUILD_RPATH when ${CUDF_LIBRARY} is added; this one can
-### potentially hide the one in the provided full path and cmake generates a warning (and RPATH
-### is searched before the directories in /etc/ld.so/conf; ld.so.conf does not coincide but
-### overlaps with implicit directories).
-###
-### If we provide just the library names (gomp;pthread), cmake does not generate warnings (we
-### did not specify which libgomp.so should be loaded in runtime), and the one first found in
-### the search order is loaded (we can change the loaded library by setting LD_LIBRARY_PATH or
-### manually editing BUILD_RPATH).
-###
-### Manually editing BUILD_RPATH:
-### set(TARGET_BUILD_RPATH "")
-### foreach(TMP_VAR_FULLPATH IN LISTS OpenMP_CXX_LIBRARIES)
-### get_filename_component(TMP_VAR_DIR ${TMP_VAR_FULLPATH} DIRECTORY)
-### string(APPEND TARGET_BUILD_RPATH "${TMP_VAR_DIR};")
-### get_filename_component(TMP_VAR_REALPATH ${TMP_VAR_FULLPATH} REALPATH)
-### get_filename_component(TMP_VAR_DIR ${TMP_VAR_REALPATH} DIRECTORY)
-### # cmake automatically removes duplicates, so skip checking.
-### string(APPEND TARGET_BUILD_RPATH "${TMP_VAR_DIR};")
-### endforeach()
-### string(APPEND TARGET_BUILD_RPATH "${CONDA_PREFIX}/lib")
-### message(STATUS "TARGET_BUILD_RPATH=${TARGET_BUILD_RPATH}")
-### set_target_properties(target PROPERTIES
-### BUILD_RPATH "${TARGET_BUILD_RPATH}")
- ${OpenMP_CXX_LIB_NAMES})
- endif(OpenMP_CXX_FOUND)
-
  add_test(NAME ${CMAKE_TEST_NAME} COMMAND ${CMAKE_TEST_NAME})
 
  set_target_properties(
@@ -159,57 +108,6 @@ function(ConfigureTestMG CMAKE_TEST_NAME)
  MPI::MPI_CXX
  )
 
- if(OpenMP_CXX_FOUND)
- target_link_libraries(${CMAKE_TEST_NAME} PRIVATE
-###################################################################################################
-### Use ${OpenMP_CXX_LIB_NAMES} instead of OpenMP::OpenMP_CXX to avoid the following warnings.
-###
-### Cannot generate a safe runtime search path for target TARGET_NAME
-### because files in some directories may conflict with libraries in implicit
-### directories:
-### ...
-###
-### libgomp.so is included in the conda base environment and copied to every new conda
-### environment. If a full file path is provided (e.g ${CUDF_LIBRARY}), cmake
-### extracts the directory path and adds the directory path to BUILD_RPATH (if BUILD_RPATH is not
-### disabled).
-###
-### cmake maintains a system specific implicit directories (e.g. /lib, /lib/x86_64-linux-gnu,
-### /lib32, /lib32/x86_64-linux-gnu, /lib64, /lib64/x86_64-linux-gnu, /usr/lib,
-### /usr/lib/gcc/x86_64-linux-gnu/7, /usr/lib/x86_64-linux-gnu, /usr/lib32,
-### /usr/lib32/x86_64-linux-gnu, /usr/lib64, /usr/lib64/x86_64-linux-gnu,
-### /usr/local/cuda-10.0/lib64", /usr/local/cuda-10.0/lib64/stubs).
-###
-### If a full path to libgomp.so is provided (which is the case with OpenMP::OpenMP_CXX), cmake
-### checks whether there is any other libgomp.so with the different full path (after resolving
-### soft links) in the search paths (implicit directoires + BUILD_RAPTH). There is one in the
-### path included in BUILD_RPATH when ${CUDF_LIBRARY} is added; this one can
-### potentially hide the one in the provided full path and cmake generates a warning (and RPATH
-### is searched before the directories in /etc/ld.so/conf; ld.so.conf does not coincide but
-### overlaps with implicit directories).
-###
-### If we provide just the library names (gomp;pthread), cmake does not generate warnings (we
-### did not specify which libgomp.so should be loaded in runtime), and the one first found in
-### the search order is loaded (we can change the loaded library by setting LD_LIBRARY_PATH or
-### manually editing BUILD_RPATH).
-###
-### Manually editing BUILD_RPATH:
-### set(TARGET_BUILD_RPATH "")
-### foreach(TMP_VAR_FULLPATH IN LISTS OpenMP_CXX_LIBRARIES)
-### get_filename_component(TMP_VAR_DIR ${TMP_VAR_FULLPATH} DIRECTORY)
-### string(APPEND TARGET_BUILD_RPATH "${TMP_VAR_DIR};")
-### get_filename_component(TMP_VAR_REALPATH ${TMP_VAR_FULLPATH} REALPATH)
-### get_filename_component(TMP_VAR_DIR ${TMP_VAR_REALPATH} DIRECTORY)
-### # cmake automatically removes duplicates, so skip checking.
-### string(APPEND TARGET_BUILD_RPATH "${TMP_VAR_DIR};")
-### endforeach()
-### string(APPEND TARGET_BUILD_RPATH "${CONDA_PREFIX}/lib")
-### message(STATUS "TARGET_BUILD_RPATH=${TARGET_BUILD_RPATH}")
-### set_target_properties(target PROPERTIES
-### BUILD_RPATH "${TARGET_BUILD_RPATH}")
- ${OpenMP_CXX_LIB_NAMES})
- endif(OpenMP_CXX_FOUND)
-
  add_test(NAME ${CMAKE_TEST_NAME}
  COMMAND ${MPIEXEC_EXECUTABLE}
  "--noprefix"