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From: Szabolcs Nagy <nsz@port70.net>
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Subject: Re: why is there no __MUSL__ macro?
Date: Thu, 11 Sep 2014 16:48:55 +0200
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* J?rg Krause <jkrause@posteo.de> [2014-09-11 15:33:16 +0200]:
> eg, in FFmpeg/libavutils uses strerror_r which is implemented as a
> XSI-compliant and a GNU-specific version. If I want to be sure to get the
> XSI-compliant version, I unset _GNU_SOURCE and set _XOPEN_SOURCE=600. So I
> do not need any further testing here, right?

yes, using feature test macros should work
(unless you want to support some very old version of the libc)