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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Problem with portable dumper
Date: Sat, 15 Feb 2020 21:20:22 +0200
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To: Michael Albinus <michael.albinus@gmx.de>
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In-reply-to: <87ftfby9in.fsf@gmx.de> (message from Michael Albinus on Sat, 15
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> From: Michael Albinus <michael.albinus@gmx.de>
> Date: Sat, 15 Feb 2020 19:45:36 +0100
> 
> Dumping under the name bootstrap-emacs.pdmp
> dumping fingerprint: 406add9509f46ad13554dfa8c2b5c4d2346e735f891479807515cd7a5226ec69
> unsupported object type in dump: mutex
> --8<---------------cut here---------------end--------------->8---
> 
> The error message comes from pdumper.c/dump_vectorlike, and it is likely
> because I use threads, mutexes and condvars in some pre-loaded files,
> like files.el or vc-hooks.el.
> 
> How could this be solved? Does dump_vectorlike needs to be extended?

Either extend dump_vectorlike, or figure out how to leave mutex
variables out of state that is dumped, I think.  Why do you need
mutexes to be dumped?