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I am checking for accept4 on Linux like this:
check_symbol_exists(accept4 sys/socket.h HAVE_ACCEPT4)
However, accept4 is only defined if _GNU_SOURCE is defined beforehand. How can I force the checker to defined _GNU_SOURCE before the check?
Sure, use
list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)before callingcheck_symbol_exists()andlist(REMOVE_ITEM CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)to cleanup after the check.