Heikki Linnakangas <hlinn...@iki.fi> writes:
> It's worth noting that now that libpq constructs the command line to 
> execute "postgres --child= -D <datadir>", we'll be stuck with that set 
> of arguments forever, because libpq needs to be able to talk to 
> different versions. Or at least we'd need to teach libpq to check the 
> version of binary and act accordingly, if we change that syntax. That's 
> probably OK, I don't feel any pressure to change those command line 
> arguments anyway.

Yeah.  The -D syntax seems safe enough from here.  One thing that's on
my to-do list for this patch is to add a -v switch to set the protocol
version, so that we don't need to assume that libpq and backend have the
same default protocol version.

                        regards, tom lane

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