Re: Regression on Cygwin: Problems with parallel make in 4.4

[Ken Brown]

On 2/15/2023 1:34 PM, Bruno Haible wrote:
> Paul Smith wrote:
> > > And possibly also on GNU/Hurd. Cf.
> > > https://lists.gnu.org/archive/html/bug-make/2023-01/msg00107.html
> >
> > I may be misremembering but I thought that you had tried forcing the
> > pipe jobserver option on GNU/Hurd and it didn't help.
>
> This must be a misunderstanding. I never said that. I don't even know
> how to do this, within the framework of GNU make's test suite.
>
> All I said was, comparing the Cygwin failures with the GNU/Hurd failures [1]:
>    "In all these failures, where we see an error message "Leftover temporary
>     files" in GNU/Hurd, we see "Device or resource busy" in Cygwin."
>
> Bruno
>
> [1] https://lists.gnu.org/archive/html/bug-make/2023-01/msg00134.html

One thing to keep in mind here is that your tests on Cygwin were done on 
Cygwin 2.9.0, in which FIFOs were very poorly supported.  For example, a 
FIFO couldn't have multiple readers or writers.  If GNU/Hurd has similar 
limitations, that could explain the similar test results.

Cygwin's FIFO implementation was completely rewritten starting with 3.0, 
and it now supports multiple readers and writers.  So the issue with 
current Cygwin is more likely a bug in Cygwin and/or make.

Marco, did you by any chance run the test suite when you built make for 
Cygwin?  It would by interesting to know what test failures there are 
with Cygwin 3.4.6.

Ken

P.S. Here's a footnote about the failures I'm seeing.  I cited

  https://tug.org/pipermail/tlbuild/2023q1/005290.html ,

in which I reported problems with the build of TeX Live.  I said I had a 
hang in 'make -j13 world'.  This was an oversimplification.  What really 
happens is that the hang occurs when I run the 'Build' script provided 
by the TeX Live sources.  This is a shell script that runs make in a 
further sub-shell.  If I simply run 'make -j13 world' without using the 
Build script, it doesn't hang.  I don't know if this provides any clue 
as to where the problem is.