MacOS error in threadpool_unix.cc: there was no matching member function for call to 'compare_exchange_weak'.

/Users/travis/build/percona/percona-server/sql/threadpool_unix.cc:1308:35: error: no matching member function for call to 'compare_exchange_weak'
    pool_timer.next_timeout_check.compare_exchange_weak(old, abstime);
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode-9.4.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/atomic:962:10: note: candidate function not viable: no known conversion from 'ulong' (aka 'unsigned long') to 'unsigned long long &' for 1st argument
    bool compare_exchange_weak(_Tp& __e, _Tp __d,