Horton

Re: Does MSVC predefine __x86_64__ on 64-bit Intel?

Nathan Bossart <nathandbossart@gmail.com>

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From: Nathan Bossart <nathandbossart@gmail.com>
To: Peter Eisentraut <peter@eisentraut.org>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, pgsql-hackers@lists.postgresql.org
Date: 2026-06-03T18:55:52Z
Lists: pgsql-hackers 
On Wed, Jun 03, 2026 at 08:33:50PM +0200, Peter Eisentraut wrote:
> On 03.06.26 18:17, Tom Lane wrote:
>> Not being a Windows person, I can't easily answer these
>> questions by experiment.  But I think they need answering
>> (and then documenting).
> 
> This can be tested on https://godbolt.org/.  My testing there suggests that
> neither __x86_64__ nor __x86_64 are defined.

Some related threads:

	https://postgr.es/m/flat/afouZUH_eUkIj4i4%40nathan
	https://postgr.es/m/flat/CA%2BhUKGL8Hs-phHPugrWM%3D5dAkcT897rXyazYzLw-Szxnzgx-rA%40mail.gmail.com

-- 
nathan

Commits

  1. Clean up inconsistencies in CPU-identification macros.