initdb: Select working dynamic shared memory implementation.
initdb: Select working dynamic shared memory implementation.

If POSIX shared memory is supported and works, we prefer it.
Otherwise, we prefer System V, except on Windows, where we use
the implementation specific to that platform.

ovr/postgres-xl,greenplum-db/gpdb,zeroae/postgres-xl,pavanvd/postgres-xl,jmcatamney/gpdb,lisakowen/gpdb,jmcatamney/gpdb,adam8157/gpdb,xinzweb/gpdb,50wu/gpdb,zeroae/postgres-xl,lisakowen/gpdb,techdragon/Postgres-XL,ashwinstar/gpdb,greenplum-db/gpdb,adam8157/gpdb,jmcatamney/gpdb,zeroae/postgres-xl,xinzweb/gpdb,adam8157/gpdb,lisakowen/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,adam8157/gpdb,techdragon/Postgres-XL,Postgres-XL/Postgres-XL,pavanvd/postgres-xl,lisakowen/gpdb,oberstet/postgres-xl,50wu/gpdb,xinzweb/gpdb,ashwinstar/gpdb,ashwinstar/gpdb,ovr/postgres-xl,ovr/postgres-xl,pavanvd/postgres-xl,oberstet/postgres-xl,50wu/gpdb,zeroae/postgres-xl,greenplum-db/gpdb,50wu/gpdb,adam8157/gpdb,ashwinstar/gpdb,adam8157/gpdb,50wu/gpdb,ovr/postgres-xl,yazun/postgres-xl,jmcatamney/gpdb,adam8157/gpdb,50wu/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,yazun/postgres-xl,adam8157/gpdb,ashwinstar/gpdb,yazun/postgres-xl,oberstet/postgres-xl,ashwinstar/gpdb,yazun/postgres-xl,oberstet/postgres-xl,Postgres-XL/Postgres-XL,Postgres-XL/Postgres-XL,techdragon/Postgres-XL,xinzweb/gpdb,ovr/postgres-xl,greenplum-db/gpdb,greenplum-db/gpdb,yazun/postgres-xl,greenplum-db/gpdb,xinzweb/gpdb,greenplum-db/gpdb,zeroae/postgres-xl,xinzweb/gpdb,techdragon/Postgres-XL,xinzweb/gpdb,jmcatamney/gpdb,oberstet/postgres-xl,Postgres-XL/Postgres-XL,lisakowen/gpdb,lisakowen/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,techdragon/Postgres-XL,greenplum-db/gpdb,Postgres-XL/Postgres-XL,xinzweb/gpdb,pavanvd/postgres-xl,50wu/gpdb,lisakowen/gpdb,jmcatamney/gpdb,50wu/gpdb