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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Alexander Korotkov <aekorotkov@gmail.com>
Cc: Thomas Munro <thomas.munro@gmail.com>
Cc: Heikki Linnakangas <hlinnaka@iki.fi>
Cc: Alexander Korotkov <akorotkov@postgresql.org>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Subject: Re: Detecting pointer misalignment (was Re: pgsql: Implementation of subscripting for jsonb)
Date: Fri, 12 Feb 2021 17:35:46 -0500
Message-ID: <1610202.1613169346@sss.pgh.pa.us> (raw)
In-Reply-To: <1557041.1613150383@sss.pgh.pa.us>
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	<37bb56a0-391d-759d-771b-9c1d8c15a84b@iki.fi>
	<3293925.1612163110@sss.pgh.pa.us>
	<CAPpHfdsne3=T=fMNU45PtxdhSL_J2PjLTeS8rwKnJzUR4YNd4w@mail.gmail.com>
	<CAPpHfdu8Jh0tySa50Zhkyg6gMvi2pQFdHAMiF+UkZNqsDLwTQw@mail.gmail.com>
	<475514.1612745257@sss.pgh.pa.us>
	<CAPpHfdvh+QrbBCo=uY=_fHK8w7yKr=Q4KGAtp=3tzp62SjODrA@mail.gmail.com>
	<CA+hUKGLs9xMUDY=Oh0uOyJysaY=NGg3y53q_Tr2C+LLqstYf6A@mail.gmail.com>
	<CAPpHfduDEYtWEB+xhM3PcP4bFwJ3aqZw7R7xFto8+pVDV5w-MA@mail.gmail.com>
	<1557041.1613150383@sss.pgh.pa.us>

I wrote:
> Looking around at other recent reports, it looks like we'll need to tweak
> the compiler version cutoffs a bit.  I see for instance that spurfowl,
> with gcc (Ubuntu 5.4.0-6ubuntu1~16.04.11) 5.4.0 20160609, is whining:
> ...
> So maybe it'd better be __GNUC__ >= 6 not __GNUC__ >= 5.  I think
> we can wait a little bit for more reports before messing with that,
> though.

Further reports show that gcc 6.x and 7.x also produce warnings,
so I moved the cutoff up to 8.  Hopefully that's good enough.
We could write a configure test instead, but I'd just as soon not
expend configure cycles on this.

			regards, tom lane





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