There is no -O4 in gcc, read the source ;)
There is no -O4 in gcc, read the source ;)

wgapl/pcl,lebronzhang/pcl,ipa-rmb/pcl,msalvato/pcl_kinfu_highres,jakobwilm/pcl,LZRS/pcl,RufaelDev/pcc-mp3dg,nikste/pcl,sbec/pcl,fanxiaochen/mypcltest,stefanbuettner/pcl,nikste/pcl,mschoeler/pcl,DaikiMaekawa/pcl,jakobwilm/pcl,KevenRing/vlp,starius/pcl,lebronzhang/pcl,krips89/pcl_newfeatures,sbec/pcl,KevenRing/vlp,fskuka/pcl,closerbibi/pcl,simonleonard/pcl,stfuchs/pcl,kanster/pcl,lydhr/pcl,wgapl/pcl,shivmalhotra/pcl,sbec/pcl,stfuchs/pcl,DaikiMaekawa/pcl,stefanbuettner/pcl,3dtof/pcl,cascheberg/pcl,ipa-rmb/pcl,drmateo/pcl,shangwuhencc/pcl,shivmalhotra/pcl,damienjadeduff/pcl,zavataafnan/pcl-truck,cascheberg/pcl,fanxiaochen/mypcltest,RufaelDev/pcc-mp3dg,chatchavan/pcl,v4hn/pcl,chenxingzhe/pcl,RufaelDev/pcc-mp3dg,krips89/pcl_newfeatures,shangwuhencc/pcl,MMiknis/pcl,drmateo/pcl,msalvato/pcl_kinfu_highres,chatchavan/pcl,msalvato/pcl_kinfu_highres,mschoeler/pcl,v4hn/pcl,chatchavan/pcl,srbhprajapati/pcl,fskuka/pcl,closerbibi/pcl,nikste/pcl,KevenRing/vlp,jeppewalther/kinfu_segmentation,lebronzhang/pcl,ipa-rmb/pcl,ResByte/pcl,ResByte/pcl,KevenRing/pcl,krips89/pcl_newfeatures,RufaelDev/pcc-mp3dg,starius/pcl,the-glu/pcl,zhangxaochen/pcl,jakobwilm/pcl,shangwuhencc/pcl,3dtof/pcl,Tabjones/pcl,zhangxaochen/pcl,shangwuhencc/pcl,stfuchs/pcl,sbec/pcl,fanxiaochen/mypcltest,nh2/pcl,raydtang/pcl,krips89/pcl_newfeatures,nh2/pcl,mikhail-matrosov/pcl,locnx1984/pcl,kanster/pcl,shivmalhotra/pcl,kanster/pcl,stfuchs/pcl,the-glu/pcl,soulsheng/pcl,pkuhto/pcl,simonleonard/pcl,nh2/pcl,locnx1984/pcl,KevenRing/vlp,zavataafnan/pcl-truck,damienjadeduff/pcl,mikhail-matrosov/pcl,shyamalschandra/pcl,drmateo/pcl,starius/pcl,fanxiaochen/mypcltest,msalvato/pcl_kinfu_highres,pkuhto/pcl,shivmalhotra/pcl,LZRS/pcl,RufaelDev/pcc-mp3dg,srbhprajapati/pcl,3dtof/pcl,lydhr/pcl,mschoeler/pcl,ResByte/pcl,locnx1984/pcl,DaikiMaekawa/pcl,mikhail-matrosov/pcl,damienjadeduff/pcl,LZRS/pcl,zhangxaochen/pcl,drmateo/pcl,ipa-rmb/pcl,jakobwilm/pcl,KevenRing/pcl,KevenRing/pcl,wgapl/pcl,KevenRing/pcl,KevenRing/vlp,ResByte/pcl,the-glu/pcl,mikhail-matrosov/pcl,zhangxaochen/pcl,msalvato/pcl_kinfu_highres,LZRS/pcl,jeppewalther/kinfu_segmentation,fskuka/pcl,the-glu/pcl,shyamalschandra/pcl,pkuhto/pcl,lebronzhang/pcl,chenxingzhe/pcl,cascheberg/pcl,damienjadeduff/pcl,v4hn/pcl,lydhr/pcl,pkuhto/pcl,stefanbuettner/pcl,raydtang/pcl,nikste/pcl,srbhprajapati/pcl,shyamalschandra/pcl,stefanbuettner/pcl,nikste/pcl,zavataafnan/pcl-truck,jeppewalther/kinfu_segmentation,closerbibi/pcl,zavataafnan/pcl-truck,mschoeler/pcl,Tabjones/pcl,mikhail-matrosov/pcl,locnx1984/pcl,stefanbuettner/pcl,simonleonard/pcl,shyamalschandra/pcl,fskuka/pcl,srbhprajapati/pcl,damienjadeduff/pcl,shivmalhotra/pcl,srbhprajapati/pcl,mschoeler/pcl,DaikiMaekawa/pcl,jeppewalther/kinfu_segmentation,Tabjones/pcl,Tabjones/pcl,sbec/pcl,fskuka/pcl,ipa-rmb/pcl,shangwuhencc/pcl,stfuchs/pcl,soulsheng/pcl,closerbibi/pcl,starius/pcl,lydhr/pcl,jeppewalther/kinfu_segmentation,v4hn/pcl,fanxiaochen/mypcltest,cascheberg/pcl,locnx1984/pcl,3dtof/pcl,starius/pcl,pkuhto/pcl,lebronzhang/pcl,jakobwilm/pcl,simonleonard/pcl,wgapl/pcl,raydtang/pcl,MMiknis/pcl,kanster/pcl,simonleonard/pcl,kanster/pcl,wgapl/pcl,chenxingzhe/pcl,closerbibi/pcl,soulsheng/pcl,KevenRing/pcl,shyamalschandra/pcl,LZRS/pcl,DaikiMaekawa/pcl,raydtang/pcl,the-glu/pcl,zavataafnan/pcl-truck,MMiknis/pcl,chenxingzhe/pcl,lydhr/pcl,3dtof/pcl,soulsheng/pcl,chenxingzhe/pcl,ResByte/pcl,soulsheng/pcl,nh2/pcl,krips89/pcl_newfeatures,chatchavan/pcl,MMiknis/pcl,v4hn/pcl,MMiknis/pcl,cascheberg/pcl,Tabjones/pcl,raydtang/pcl,zhangxaochen/pcl,drmateo/pcl