Re: Centralised architecture detection

From: Nico Williams <nico(at)cryptonector(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Dagfinn Ilmari Mannsåker <ilmari(at)ilmari(dot)org>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Andres Freund <andres(at)anarazel(dot)de>, Lukas Fittl <lukas(at)fittl(dot)com>, John Naylor <johncnaylorls(at)gmail(dot)com>, Bryan Green <dbryan(dot)green(at)gmail(dot)com>
Subject: Re: Centralised architecture detection
Date: 2026-06-03 21:21:14
Message-ID: aiCayoqVfvLDM9bO@ubby
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On Wed, Jun 03, 2026 at 05:08:55PM -0400, Tom Lane wrote:
> I wrote:
> > Nathan Bossart reminded me of this thread after I'd independently
> > rediscovered the same thing [1]. I agree with standardizing on
> > just one spelling of these CPU-type macros. But I wonder why we
> > should invent our own instead of standardizing on gcc's spellings
> > (that is, __x86_64__ etc). The amount of code churn required for
> > this patch would drop drastically if we did it that way. And I
> > suspect it would be less likely that we'd need to fixup future patch
> > submissions than if we have a homegrown standard.
>
> Concretely, I'm imagining that we'd do more or less the attached in
> c.h, and then the rest of the work would just be to remove the
> not-very-large number of references to the alternative CPU symbols.

Can a pre-processor make it an error for users to define __ macros?

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