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Date:	Tue, 22 Mar 2022 11:52:03 -0600
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Subject:	Re: GNU make losing jobserver tokens in pipes
To:	cygwin AT cygwin DOT com
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From:	Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
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On 2022-03-22 00:54, Noel Grandin wrote:
> On 2022/03/21 5:09 pm, Ken Brown wrote:
>> On 3/21/2022 10:28 AM, Magnus Ihse Bursie wrote:
>>> We have had a long-standing issue with make losing jobserver tokens. 
>>> ("long-standing" here means for years, and years, at least since GNU 
>>> make 4.0, up to and including the current latest version in Cygwin.)

> It was not that long ago that Linus Torvalds found a bug in the Linux 
> kernel pipe implementation which caused GNU make to lose jobserver 
> tokens, so possibly researching that bug may shed some light on the 
> kinds of things that could be wrong with the Cygwin pipe code.
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0ddad21d3e99c743a3aa473121dc5561679e26bb 
> 
> https://lkml.org/lkml/2019/12/18/1064

Perhaps add "in pipes" to subject to get that maintainer's attention?

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

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