Hello Jeff,
I suspect the easiest thing to narrow it down would be to bisect the
problem in gcc :(
Their commit r265241 is what broke the PostgreSQL build. It also broke the
compiler itself--at that commit it was no longer possible to build itself.
I had to --disable-bootstrap in order to get a r265241 compiler to test
PostgreSQL on.
It seems they have done a API change around some kind of "range" analysis,
which must have been incomplete.
Their commit r265375 fixed the ability to compile itself, but built
PostgreSQL binaries remain broken there and thereafter.
|...]
Thanks a lot for this investigation! I can fill in a gcc bug report. There
would be a enormous work to narrow it down to a small test case, it is
unclear how they can act about it, but at least they would know.
--
Fabien.
