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From: Nathan Bossart <[email protected]>
To: Tom Lane <[email protected]>
Cc: Peter Eisentraut <[email protected]>
Cc: Zhang Mingli <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: [BUG?] macOS (Intel) build warnings: "ranlib: file … has no symbols" for aarch64 objects
Date: Wed, 4 Feb 2026 10:54:22 -0600
Message-ID: <aYN5vmHb89m3sfgs@nathan> (raw)
In-Reply-To: <[email protected]>
References: <b3e0930c-e86c-4a6e-8059-281424ca6d69@Spark>
	<229aaaf3-f529-44ed-8e50-00cb6909af21@Spark>
	<[email protected]>
	<[email protected]>

On Wed, Feb 04, 2026 at 10:28:53AM -0500, Tom Lane wrote:
> Peter Eisentraut <[email protected]> writes:
>> On 29.01.26 07:35, Zhang Mingli wrote:
>>> These warnings appear to be related to the recent AArch64 (pg_popcount) 
>>> optimization commits (possibly 79e232ca013c and fbe327e5b465d). It seems 
>>> that on my Intel-based macOS system, the build process is generating 
>>> empty or placeholder object files for the AArch64-specific implementations.
>>> While there is no functional impact in my environment, I'm reporting 
>>> this to ensure it's noted, as other macOS/Intel users might encounter 
>>> the same warnings during their build.
> 
>> Probably not worth fixing, since this is an obsolescent platform.
> 
> Yeah.  My Intel Mac buildfarm animal (longfin) has been showing this
> for some time, but there's no corresponding warning on its ARM Mac
> brethren (sifaka/indri).  I doubt it's worth fixing just to get
> rid of the warning.  Although if a fix arises organically out of the
> nearby thread about popcount refactoring, that would be okay here...

Hm.  The options I see for fixing this seem to be:

* Pass -no_warning_for_no_symbols flag on this platform, but that option
might not be available in older toolchains.

* Add a random symbol to this file.  That seems like a hack.

* Add build logic to only compile this file when necessary.  I've been
trying to get rid of complexity here, so this feels like a step backwards.

IMHO none of these options seem worth the effort to fix a warning on an
obsolescent platform, so my vote is to do nothing for now.

-- 
nathan

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