Allow auto-detection of cpp and required flags.
Allow auto-detection of cpp and required flags.

cjcjameson/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,chrishajas/gpdb,ashwinstar/gpdb,atris/gpdb,snaga/postgres-xl,kaknikhil/gpdb,yuanzhao/gpdb,Quikling/gpdb,Quikling/gpdb,postmind-net/postgres-xl,CraigHarris/gpdb,Quikling/gpdb,greenplum-db/gpdb,randomtask1155/gpdb,lpetrov-pivotal/gpdb,lintzc/gpdb,postmind-net/postgres-xl,xinzweb/gpdb,rvs/gpdb,Postgres-XL/Postgres-XL,pavanvd/postgres-xl,oberstet/postgres-xl,jmcatamney/gpdb,atris/gpdb,foyzur/gpdb,tpostgres-projects/tPostgres,snaga/postgres-xl,adam8157/gpdb,xinzweb/gpdb,janebeckman/gpdb,Postgres-XL/Postgres-XL,jmcatamney/gpdb,tangp3/gpdb,jmcatamney/gpdb,tpostgres-projects/tPostgres,edespino/gpdb,50wu/gpdb,atris/gpdb,greenplum-db/gpdb,Chibin/gpdb,ahachete/gpdb,xuegang/gpdb,rubikloud/gpdb,randomtask1155/gpdb,kaknikhil/gpdb,postmind-net/postgres-xl,zeroae/postgres-xl,jmcatamney/gpdb,tangp3/gpdb,chrishajas/gpdb,janebeckman/gpdb,royc1/gpdb,kaknikhil/gpdb,greenplum-db/gpdb,CraigHarris/gpdb,ashwinstar/gpdb,xinzweb/gpdb,janebeckman/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,50wu/gpdb,kmjungersen/PostgresXL,kaknikhil/gpdb,kaknikhil/gpdb,lpetrov-pivotal/gpdb,lisakowen/gpdb,royc1/gpdb,lisakowen/gpdb,xuegang/gpdb,ovr/postgres-xl,adam8157/gpdb,techdragon/Postgres-XL,lintzc/gpdb,yuanzhao/gpdb,adam8157/gpdb,xinzweb/gpdb,rubikloud/gpdb,randomtask1155/gpdb,ahachete/gpdb,rvs/gpdb,techdragon/Postgres-XL,rubikloud/gpdb,lisakowen/gpdb,zeroae/postgres-xl,snaga/postgres-xl,rubikloud/gpdb,greenplum-db/gpdb,CraigHarris/gpdb,cjcjameson/gpdb,Chibin/gpdb,greenplum-db/gpdb,xuegang/gpdb,arcivanov/postgres-xl,0x0FFF/gpdb,lpetrov-pivotal/gpdb,Chibin/gpdb,oberstet/postgres-xl,pavanvd/postgres-xl,chrishajas/gpdb,0x0FFF/gpdb,ashwinstar/gpdb,CraigHarris/gpdb,0x0FFF/gpdb,randomtask1155/gpdb,ovr/postgres-xl,Postgres-XL/Postgres-XL,oberstet/postgres-xl,yuanzhao/gpdb,yazun/postgres-xl,ahachete/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,xuegang/gpdb,cjcjameson/gpdb,janebeckman/gpdb,foyzur/gpdb,jmcatamney/gpdb,pavanvd/postgres-xl,lintzc/gpdb,zaksoup/gpdb,Quikling/gpdb,randomtask1155/gpdb,rvs/gpdb,0x0FFF/gpdb,arcivanov/postgres-xl,rubikloud/gpdb,rubikloud/gpdb,snaga/postgres-xl,xuegang/gpdb,50wu/gpdb,lintzc/gpdb,janebeckman/gpdb,xuegang/gpdb,chrishajas/gpdb,techdragon/Postgres-XL,janebeckman/gpdb,yuanzhao/gpdb,50wu/gpdb,oberstet/postgres-xl,atris/gpdb,lintzc/gpdb,yazun/postgres-xl,ahachete/gpdb,randomtask1155/gpdb,zaksoup/gpdb,lpetrov-pivotal/gpdb,tangp3/gpdb,yazun/postgres-xl,foyzur/gpdb,edespino/gpdb,xuegang/gpdb,rvs/gpdb,Quikling/gpdb,CraigHarris/gpdb,edespino/gpdb,chrishajas/gpdb,ahachete/gpdb,50wu/gpdb,royc1/gpdb,50wu/gpdb,xinzweb/gpdb,foyzur/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,lpetrov-pivotal/gpdb,postmind-net/postgres-xl,ahachete/gpdb,0x0FFF/gpdb,Chibin/gpdb,janebeckman/gpdb,Quikling/gpdb,yuanzhao/gpdb,rvs/gpdb,janebeckman/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,zeroae/postgres-xl,lintzc/gpdb,kmjungersen/PostgresXL,janebeckman/gpdb,edespino/gpdb,CraigHarris/gpdb,tangp3/gpdb,foyzur/gpdb,techdragon/Postgres-XL,yuanzhao/gpdb,ovr/postgres-xl,ovr/postgres-xl,zaksoup/gpdb,lisakowen/gpdb,lintzc/gpdb,greenplum-db/gpdb,edespino/gpdb,zeroae/postgres-xl,lpetrov-pivotal/gpdb,randomtask1155/gpdb,foyzur/gpdb,kmjungersen/PostgresXL,randomtask1155/gpdb,ahachete/gpdb,edespino/gpdb,rvs/gpdb,lintzc/gpdb,Chibin/gpdb,foyzur/gpdb,atris/gpdb,ashwinstar/gpdb,tangp3/gpdb,Quikling/gpdb,adam8157/gpdb,oberstet/postgres-xl,Chibin/gpdb,kaknikhil/gpdb,lisakowen/gpdb,rvs/gpdb,50wu/gpdb,yuanzhao/gpdb,janebeckman/gpdb,yuanzhao/gpdb,tangp3/gpdb,lpetrov-pivotal/gpdb,arcivanov/postgres-xl,royc1/gpdb,0x0FFF/gpdb,xuegang/gpdb,chrishajas/gpdb,Quikling/gpdb,0x0FFF/gpdb,edespino/gpdb,zaksoup/gpdb,ahachete/gpdb,adam8157/gpdb,foyzur/gpdb,ashwinstar/gpdb,lisakowen/gpdb,CraigHarris/gpdb,tangp3/gpdb,jmcatamney/gpdb,lpetrov-pivotal/gpdb,arcivanov/postgres-xl,rubikloud/gpdb,rubikloud/gpdb,arcivanov/postgres-xl,cjcjameson/gpdb,lisakowen/gpdb,kaknikhil/gpdb,xinzweb/gpdb,Quikling/gpdb,arcivanov/postgres-xl,kmjungersen/PostgresXL,CraigHarris/gpdb,CraigHarris/gpdb,tangp3/gpdb,techdragon/Postgres-XL,royc1/gpdb,xinzweb/gpdb,kmjungersen/PostgresXL,tpostgres-projects/tPostgres,Quikling/gpdb,rvs/gpdb,atris/gpdb,xuegang/gpdb,snaga/postgres-xl,zaksoup/gpdb,50wu/gpdb,Chibin/gpdb,Postgres-XL/Postgres-XL,ovr/postgres-xl,adam8157/gpdb,tpostgres-projects/tPostgres,Chibin/gpdb,royc1/gpdb,Postgres-XL/Postgres-XL,atris/gpdb,zaksoup/gpdb,chrishajas/gpdb,chrishajas/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,zaksoup/gpdb,edespino/gpdb,rvs/gpdb,greenplum-db/gpdb,pavanvd/postgres-xl,0x0FFF/gpdb,postmind-net/postgres-xl,Chibin/gpdb,zaksoup/gpdb,Chibin/gpdb,pavanvd/postgres-xl,cjcjameson/gpdb,royc1/gpdb,adam8157/gpdb,yazun/postgres-xl,lintzc/gpdb,royc1/gpdb,cjcjameson/gpdb,edespino/gpdb,atris/gpdb,tpostgres-projects/tPostgres,yuanzhao/gpdb,zeroae/postgres-xl,adam8157/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,lisakowen/gpdb,rvs/gpdb,yazun/postgres-xl,edespino/gpdb,xinzweb/gpdb