CHECK_FUNCTION_EXISTS(vasprintf HAVE_VASPRINTF)
CHECK_FUNCTION_EXISTS(makecontext HAVE_MAKECONTEXT)
CHECK_FUNCTION_EXISTS(mmap HAVE_MMAP)
+CHECK_FUNCTION_EXISTS(mergesort HAVE_MERGESORT)
#Check if __thread is defined
exec_program("${CMAKE_C_COMPILER} ${CMAKE_HOME_DIRECTORY}/buildtools/Cmake/test_prog/prog_thread_storage.c"