cmake HAVE_MONOTONIC_CLOCK examples

rAthenaCN/rAthenaCN CMakeLists.txt :255

file( READ "${CMAKE_SOURCE_DIR}/3rdparty/cmake/tests/HAVE_MONOTONIC_CLOCK.c" _SOURCE )

rAthenaCN/rAthenaCN CMakeLists.txt :256

CHECK_C_SOURCE_RUNS( "${_SOURCE}" HAVE_MONOTONIC_CLOCK )

rAthenaCN/rAthenaCN CMakeLists.txt :260

set_property( CACHE GLOBAL_DEFINITIONS  PROPERTY VALUE "${GLOBAL_DEFINITIONS} -DHAVE_MONOTONIC_CLOCK" )