gmxTestdlopen.cmake

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# - Define macro to check if DLOPEN is defined
#
#  GMX_TEST_DLOPEN(VARIABLE)
#
#  VARIABLE will be set if dlopen is present in dlfcn.h
#

macro(GMX_TEST_DLOPEN VARIABLE)
  if(NOT DEFINED ${VARIABLE})
    message(STATUS "Checking for dlopen")

    set(CMAKE_REQUIRED_INCLUDES "dlfcn.h")
    # TODO Make a proper find_package for dlopen to find
    # dlfcn.h. The CMake variable CMAKE_DL_LIBS works magically
    # for the library, however.
    set(CMAKE_REQUIRED_LIBRARIES "dl")
    check_c_source_compiles(
      "#include <dlfcn.h>
int main(void) {
  dlopen(0,0);
  return 0;
}" ${VARIABLE})

    if(${VARIABLE})
      message(STATUS "Checking for dlopen - found")
      set(${VARIABLE} 1 CACHE INTERNAL "Result of test for dlopen" FORCE)
    else()
      message(STATUS "Checking for dlopen - not found")
      set(${VARIABLE} 0 CACHE INTERNAL "Result of test for dlopen" FORCE)
    endif()
    set(CMAKE_REQUIRED_INCLUDES)
    set(CMAKE_REQUIRED_LIBRARIES)
  endif()
endmacro()