Question

How can I pass openmp flag to NVCC when in a cmake project?
My CMakeLists.txt for this project looks like this, but compilation fails with “undefined reference to `omp_get_wtime'” message.

cmake_minimum_required (VERSION 2.8.2)

set (CMAKE_MODULE_PATH 
  "${CMAKE_SOURCE_DIR}/cmake" 
  ${CMAKE_MODULE_PATH}
)

find_package (CUDA 4.0 REQUIRED)

if(OPENMP_FOUND)
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}
${OpenMP_EXE_LINKER_FLAGS}") endif()

set (CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_SOURCE_DIR}/bin)
set (CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_SOURCE_DIR}/lib)
set (CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${PROJECT_SOURCE_DIR}/lib)

if(UNIX)
  add_definitions(-DUNIX)
endif(UNIX)

add_subdirectory(xor)

CUDA_BUILD_CLEAN_TARGET()

Answer 1

I just found out that adding find_package (OpenMP) to the previous script did the trick.