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From: Joshua Hudson <joshudson@gmail.com>
Newsgroups: gmane.linux.lib.musl.general
Subject: Re: Re: posix_spawn
Date: Mon, 30 Sep 2019 18:58:15 -0700
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To: Rich Felker <dalias@libc.org>
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Xref: news.gmane.org gmane.linux.lib.musl.general:14763
Archived-At: <http://permalink.gmane.org/gmane.linux.lib.musl.general/14763>

Well that was a long dead end. posix_spawnp won't call setgroups.

You now have a quirk and I need to actually detect musl libc.

https://www.openwall.com/lists/musl/2019/06/29/6