Greetings, * Peter Eisentraut (peter.eisentr...@2ndquadrant.com) wrote: > On 4/5/18 02:04, Pavel Raiskup wrote: > > Hello, for the support of multiple versions of PostgreSQL RPM packages on > > one system, we are thinking about having only one libpq.so.5 > > (libecpg.so.6, libpgtype.so.3 respectively) supported and about building > > (linking) all the PostgreSQL package versions against that. The pattern > > would mean that we'd have to update the system-wide libraries before > > adding support for new PostgreSQL major version and that the older > > packages (say version =< 9.6) would be run against libs from newer PG > > package (say libpq.so.5 from v10). > > > > Do you think it is a good idea in general? > > yes
Adding symbol versioning would probably be a good idea, yes, though we don't have as much need as others since we've really had a rather stable ABI for a long time. > > As a followup thought; there are probably two major obstacles ATM > > > > - the DSOs' symbols are not yet versioned, and > > - the build-system doesn't seem to know how to -lpq link against > > external libpq.so I've not looked but neither of those strike me as terribly difficult to overcome, assuming they need to be overcome. > It's not clear to me why you would need these, given that Debian has > been doing this for many years without this. Huh? objdump -T /usr/lib/x86_64-linux-gnu/libpq.so.5.10 ... 0000000000021a50 g DF .text 000000000000014c Base pg_char_to_encoding 00000000000270d0 g DF .text 000000000000002c Base PQsslStruct 0000000000013880 g DF .text 00000000000001d2 Base PQmakeEmptyPGresult 0000000000017900 g DF .text 0000000000000012 Base PQmblen 000000000000ac20 g DF .text 00000000000002c0 Base PQencryptPasswordConn 000000000000fcc0 g DF .text 00000000000000f3 Base PQresetPoll 0000000000014790 g DF .text 00000000000000ef Base PQsendQuery 000000000001fc50 g DF .text 0000000000000061 Base initPQExpBuffer 00000000000152a0 g DF .text 0000000000000012 Base PQsendDescribePortal ... No, Debian doesn't do symbol versioning for libpq and I don't believe it ever has. There are other libraries in Debian where the are using symbol versioning, of course, but libpq isn't one of those. Thanks! Stephen
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