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
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