From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
cc: pgsql-hackers@postgresql.org, Thomas Munro <thomas.munro@gmail.com>,
        Justin Pryzby <pryzby@telsasoft.com>,
        Michael Paquier <michael.paquier@gmail.com>,
        Peter Eisentraut <peter.eisentraut@enterprisedb.com>
Subject: Re: meson: Add support for building with precompiled headers
In-reply-to: <20221005201742.wsvfbymo5yhlrzbl@awork3.anarazel.de>
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 <2550386.1665000554@sss.pgh.pa.us>
 <20221005201742.wsvfbymo5yhlrzbl@awork3.anarazel.de>
Comments: In-reply-to Andres Freund <andres@anarazel.de>
	message dated "Wed, 05 Oct 2022 13:17:42 -0700"
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Date: Wed, 05 Oct 2022 16:21:55 -0400
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Andres Freund <andres@anarazel.de> writes:
> On 2022-10-05 16:09:14 -0400, Tom Lane wrote:
>> Color me confused, but how does it work to #define that from the comman=
d
>> line if it can't be overridden from within the program?

> If specified on the commandline it's also used when generating the preco=
mpiled
> header - of course that's not possible when it's just #define'd in some =
.c
> file.

Ah, so there's a separate cache of precompiled headers for each set of
compiler command-line arguments?  Got it.

			regards, tom lane