From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Re: [COMMITTERS] pgsql: Disable -faggressive-loop-optimizations in gcc 4.8+ for pre-9.2 |
Date: | 2015-01-20 16:10:53 |
Message-ID: | CA+TgmoaGXsF=PWEi25hiZzy6q=uE8WRLcE0C1KYquEL=DGnDVQ@mail.gmail.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-committers pgsql-hackers |
On Tue, Jan 20, 2015 at 10:30 AM, Alvaro Herrera
<alvherre(at)2ndquadrant(dot)com> wrote:
> Tom Lane wrote:
>> Disable -faggressive-loop-optimizations in gcc 4.8+ for pre-9.2 branches.
>> With this optimization flag enabled, recent versions of gcc can generate
>> incorrect code that assumes variable-length arrays (such as oidvector)
>> are actually fixed-length because they're embedded in some larger struct.
>> The known instance of this problem was fixed in 9.2 and up by commit
>> 8137f2c32322c624e0431fac1621e8e9315202f9 and followon work, which hides
>> actually-variable-length catalog fields from the compiler altogether.
>> And we plan to gradually convert variable-length fields to official
>> "flexible array member" notation over time, which should prevent this type
>> of bug from reappearing as gcc gets smarter. We're not going to try to
>> back-port those changes into older branches, though, so apply this
>> band-aid instead.
>
> Would anybody object to me pushing this commit to branches 8.2 and 8.3?
Since those branches are out of support, I am not sure what the point
is. If we want people to be able to use those branches reasonably we
need to back-port fixes for critical security and stability issues,
not just this one thing.
But maybe I am missing something.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
From | Date | Subject | |
---|---|---|---|
Next Message | Andres Freund | 2015-01-20 16:15:01 | Re: Re: [COMMITTERS] pgsql: Disable -faggressive-loop-optimizations in gcc 4.8+ for pre-9.2 |
Previous Message | Robert Haas | 2015-01-20 15:54:04 | pgsql: Add strxfrm_l to list of functions where Windows adds an undersc |
From | Date | Subject | |
---|---|---|---|
Next Message | Thom Brown | 2015-01-20 16:13:57 | Re: Parallel Seq Scan |
Previous Message | Robert Haas | 2015-01-20 16:08:54 | Re: Merging postgresql.conf and postgresql.auto.conf |