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Date: Sun, 20 Sep 2020 06:18:13 -0600
From: Ariadne Conill <>
To:, Bruno Haible <>,
 "Dmitry V. Levin" <>
Subject: Re: Re: OS detection wrong on Alpine Linux 3.10


On 2020-09-20 05:19, Bruno Haible wrote:
> Dmitry V. Levin wrote:
>> Is this __DEFINED_va_list macro the official way of detecting musl?
> No, but in a world where the musl people don't want to provide an official
> way [1][2] and the Alpine Linux people break their previously working way of
> detecting musl [3], we (GNU) need to use our own heuristics to fulfil the
> practical need of programs (especially test suites) to distinguish musl
> systems from glibc systems.

Actually, it was a bug, and only affects Alpine Linux 3.10.0.  Any 
3.10.x release newer than that will work just fine with the pre-existing 

I don't really think it is necessary to have this check, as the 
likelihood of anyone building GNU software by hand on Alpine Linux 
3.10.0 at this point is low.


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