| From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Reducing the runtime of the core regression tests |
| Date: | 2019-04-26 02:29:41 |
| Message-ID: | CAH2-WzkhSqZj+TuULXtW1oOe729xH4odxx5sA0YhgYMBjbxeUA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Apr 25, 2019 at 7:23 PM Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> wrote:
> Maybe it takes more than -O0 in cflags to disable those, but as I said,
> the compile lines do show the -O0.
Apparently, GCC does perform some optimizations at -O0, which is
barely acknowledged by its documentation:
http://www.complang.tuwien.ac.at/kps2015/proceedings/KPS_2015_submission_29.pdf
Search the PDF for "-O0" to see numerous references to this. It seems
to be impossible to turn off all GCC optimizations.
--
Peter Geoghegan
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