CLang gives an error on -O4
CLang gives an error on -O4

clang: error: -O4 is equivalent to -O3

sartura/libwebsockets,peeracle/libwebsockets,IOPOINT/libwebsockets,wenqiwooo/syslog-libwebsockets,sartura/libwebsockets,peeracle/libwebsockets,dumganhar/libwebsockets,SoapyMan/libwebsockets,peeracle/libwebsockets,SoapyMan/libwebsockets,ralight/libwebsockets,turbulenz/libwebsockets,SoapyMan/libwebsockets,IOPOINT/libwebsockets,IOPOINT/libwebsockets,cambridgehackers/libwebsockets,GroundControl-Solutions/libwebsockets,pombredanne/libwebsockets,pankona/libwebsockets,ralight/libwebsockets,maws/libwebsockets,ralight/libwebsockets,JoakimSoderberg/libwebsockets,pankona/libwebsockets,tn0502/libwebsockets,peeracle/libwebsockets,maws/libwebsockets,pombredanne/libwebsockets,gameclosure/libwebsockets,Chilledheart/libwebsockets,tn0502/libwebsockets,dumganhar/libwebsockets,GroundControl-Solutions/libwebsockets,jmillan/libwebsockets,dumganhar/libwebsockets,SoapyMan/libwebsockets,Chilledheart/libwebsockets,maws/libwebsockets,sartura/libwebsockets,GroundControl-Solutions/libwebsockets,GroundControl-Solutions/libwebsockets,RobertoMalatesta/libwebsockets,sartura/libwebsockets,PureSwift/libwebsockets,SoapyMan/libwebsockets,Chilledheart/libwebsockets,wenqiwooo/syslog-libwebsockets,gameclosure/libwebsockets,mushroomgithub/libwebsockets,sanyaade-teachings/libwebsockets,wenqiwooo/syslog-libwebsockets,cambridgehackers/libwebsockets,tn0502/libwebsockets,ralight/libwebsockets,GroundControl-Solutions/libwebsockets,jmillan/libwebsockets,sartura/libwebsockets,turbulenz/libwebsockets,PureSwift/libwebsockets,peeracle/libwebsockets,mushroomgithub/libwebsockets,PureSwift/libwebsockets,pankona/libwebsockets,cambridgehackers/libwebsockets,tn0502/libwebsockets,JoakimSoderberg/libwebsockets,ralight/libwebsockets,cambridgehackers/libwebsockets,mushroomgithub/libwebsockets,turbulenz/libwebsockets,JoakimSoderberg/libwebsockets,RobertoMalatesta/libwebsockets,mushroomgithub/libwebsockets,jmillan/libwebsockets,PureSwift/libwebsockets,RobertoMalatesta/libwebsockets,wenqiwooo/syslog-libwebsockets,sartura/libwebsockets,sartura/libwebsockets,JoakimSoderberg/libwebsockets,pombredanne/libwebsockets,pankona/libwebsockets,gameclosure/libwebsockets,sanyaade-teachings/libwebsockets,pombredanne/libwebsockets,gameclosure/libwebsockets,dumganhar/libwebsockets,jmillan/libwebsockets,dumganhar/libwebsockets,maws/libwebsockets,PureSwift/libwebsockets,sanyaade-teachings/libwebsockets,sanyaade-teachings/libwebsockets,Chilledheart/libwebsockets,RobertoMalatesta/libwebsockets