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[bug #58979] Recursive make using jobserver hangs at completion

From: David Hefner
Subject: [bug #58979] Recursive make using jobserver hangs at completion
Date: Mon, 24 Aug 2020 11:08:32 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36

Follow-up Comment #9, bug #58979 (project make):

[comment #8 comment #8:]
> > I've attached my makefiles.
> i guess, a clarification is needed.
> The attached makefiles are a part of a bigger system. The other part is
missing. It is not possible to reproduce the issue with the attached makefiles
for anyone who is missing the other part.
> Can you write the smallest possible makefile (or a set of makefiles), such
that even people who don't have your full build environment can run to
reproduce the issue?
I will try to do that.
> > Per your suggestion, I ran with '-n.'  It revealed nothing interesting. 
> Did it hang or not?

No. It did not hang.

I designed this build system many years ago.  I believe we were running 3.80
at the time.  I confess that I have spent very little/no time tracking changes
to GNU make.  Mea culpa.  I have adjusted for some of the breaking changes,
but I have never put '+' on any recipes.  When is that needed?


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