DMARC-Filter: OpenDMARC Filter v1.4.2 delorie.com 5B5Dc9od1309593
Authentication-Results: delorie.com; dmarc=pass (p=none dis=none) header.from=cygwin.com
Authentication-Results: delorie.com; spf=pass smtp.mailfrom=cygwin.com
DKIM-Filter: OpenDKIM Filter v2.11.0 delorie.com 5B5Dc9od1309593
Authentication-Results: delorie.com;
	dkim=pass (1024-bit key, unprotected) header.d=cygwin.com header.i=@cygwin.com header.a=rsa-sha256 header.s=default header.b=efqLgvhO
X-Recipient: archive-cygwin AT delorie DOT com
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 8C4C84C31864
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1764941888;
	bh=HO6AImGTog5I+O0CBJTKVQV351XlF5aQ4+DhbKVDidU=;
	h=Date:Subject:To:References:In-Reply-To:List-Id:List-Unsubscribe:
	 List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc:
	 From;
	b=efqLgvhOU3AIrQdJNI2yAJw2QI2HEe0I/kiinLeieO8xcAlxkrTl99B8HYfjzxeO8
	 w2ocOOwWyuT98LD3Dx5WmLHikBBF8XwG9ni779rFnjTnAcohlU1BjNb/66m8iiRKVF
	 z7kXsQ3byuFRx/sEHu9a4tNrch0WRwTyuaJtgTAo=
X-Original-To: cygwin AT cygwin DOT com
Delivered-To: cygwin AT cygwin DOT com
DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 271804C31881
ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 271804C31881
ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1764941840; cv=none;
 b=vFJdJpmtvGfgHZ0sqqzS6eXujPQ7sS1vJ4Hh8i6qjm54O1pHXyDosgZBFqWgXWmgI05lc8qc8aG09xQnBOfqSFkMGIdh6zMiUJHj/K+deIN1U83Ev+gvjki4jDtLrtIUw6f0SZekydmfyqiMGfWTfj5bJlCpzKXUvwaiWfkQLvw=
ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key;
 t=1764941840; c=relaxed/simple;
 bh=OVQaXc53STQB2ht+xK465pU8itGlX86x3xo1RKMaUXY=;
 h=Message-ID:Date:MIME-Version:From:Subject:To:DKIM-Signature;
 b=JhRHs8E5r9mj4Rb+hMEIRxMHJKJ0w3CfoWWPsxqldOW7l0t4d8kLQ9lbExM82+BEWV06f5hPfFDRp1FDaPOAt16Pe7QYx+QSEJEXEEhThpG0Dk2wcmirp2zjDbpyf3IVEJ1NNPnQVi5HArU0ZLPMve5e0a9C44sJpCb4F/pBEzU=
ARC-Authentication-Results: i=1; server2.sourceware.org
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 271804C31881
Message-ID: <1ae0d609-dd05-48aa-b2bf-c3ccf39b86da@SystematicSW.ab.ca>
Date: Fri, 5 Dec 2025 06:37:17 -0700
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: Sporadic GNU make jobserver unavailable
To: cygwin AT cygwin DOT com
References: <7D93A1F2-C293-4289-94D6-B8E0C3458CF9 AT unified-streaming DOT com>
Content-Language: en-CA
Organization: Systematic Software
In-Reply-To: <7D93A1F2-C293-4289-94D6-B8E0C3458CF9@unified-streaming.com>
X-Rspamd-Server: rspamout06
X-Rspamd-Queue-Id: 428F32002B
X-Stat-Signature: 911zr316hj8bezftpazqhhueei1u94p6
X-Session-Marker: 427269616E2E496E676C69734053797374656D6174696353572E61622E6361
X-Session-ID: U2FsdGVkX18WCme/NiczK6kvEWD4MSoak6PYL5I8y88=
X-HE-Tag: 1764941838-796579
X-HE-Meta: U2FsdGVkX1+/V+cJMnKVSL3YHeulItdAIPMocPM4AkaF1ns77jW9dqNp0yROe7WdTProD2wDTCWARhIgs9VVgA6TDq2jcynaTWeNrJxnaTk+bnANNYIwNr49gyju9CxM2gwDSHJ7sIhIy1EnD/fvkFlozYaimqMET4xO7cLdF8BVtZoea8NEQ2/qE8QiH+1jUNDuc8SrokWM9OhFssOuxEwGkzVDF3slBbGVGbV5CWVKZ+VwHWg4d1n2Ul2YJNF6WUR1eBmNYziR7RuI9Gn97nMKW4+WHCHLAi6cPfsj3QAv/lY5pY5p8LZ5sSTCpSrLaX9wglo1nzcsSYCl3MuBAgcaHORDryPwSDAcWN+7c47YyezO43TYqlGnWs+Ts/C2BFGFJ9lsDeqHWPpqFNrl/qFn0o9z9abjbPyEHWyIjEqJcrTvzHV8l1dsTwT8j3pk5EmMd3TBRp8=
X-BeenThere: cygwin AT cygwin DOT com
X-Mailman-Version: 2.1.30
Precedence: list
List-Id: General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe: <https://cygwin.com/mailman/options/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive: <https://cygwin.com/pipermail/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe: <https://cygwin.com/mailman/listinfo/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
From: Brian Inglis via Cygwin <cygwin AT cygwin DOT com>
Reply-To: cygwin AT cygwin DOT com
Cc: Brian Inglis <Brian DOT Inglis AT SystematicSW DOT ab DOT ca>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Errors-To: cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com
Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from base64 to 8bit by delorie.com id 5B5Dc9od1309593

On 2025-12-05 02:18, Dimitry Andric via Cygwin wrote:
> We're using Cygwin make to build several projects in parallel mode, e.g.
> with -j 4 or sometimes higher settings, depending on the core count of
> the machine.
> 
> Sporadically, and then I'm talking about "once a week" or so, random
> jobs will fail with a non-repeatable error, and in _every_ case these
> failures are preceded by a warning from make:
> 
>    make[4]: warning: jobserver unavailable: using -j1.  Add '+' to parent make rule.
> 
> Obviously the "Add '+' to parent rule" is nonsensical, since simply
> running exactly the same job again almost always works fine. But there
> is something flaky about make's jobserver under Windows.
> 
> FWIW one machine I just observed this on has the make-4.4.1-2 package,
> which should use the "pipe" jobserver, if I interpret
> https://cygwin.com/pipermail/cygwin-announce/2023-March/010972.html
> correctly.
> 
> Does anybody know a way to further debug this issue? It must be some
> rare race condition...

https://stackoverflow.com/questions/60702726/warning-jobserver-unavailable-using-j1-add-to-parent-make-rule

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retrancher  but when there is no more to cut
                                 -- Antoine de Saint-Exupéry

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple