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

[Ken Brown]

On 2/21/2023 3:54 AM, Ken Brown wrote:
> On 2/21/2023 12:27 AM, Paul Smith wrote:
> > Just to note, I do run the regression test suite with the equivalent of
> > "jobserver-style=pipe" (basically I force the configure to believe that
> > the system doesn't support mkfifo() so it falls back to "pipe" mode).

Somehow the test suite isn't catching this problem, at least on Cygwin. 
As I mentioned in a different thread, all tests pass on Cygwin 3.4.6.

> > Can you run builds with GNU Make 4.4 and --jobserver-style=pipe?  Do
> > you see the same warnings there?  I just want to know if the problem
> > happened in 4.4 or post-4.4.  If the latter, that's very odd.  If the
> > former, it's more understandable because we did make the "pipe" mode
> > more strict in 4.4.
>
> I do see it in 4.4 with --jobserver-style=pipe.  I misspoke when I said 
> I first saw it in 4.4.0.90.
>
> > This message means only one thing: the parent make didn't provide the
> > proper environment (that is, the correct file descriptors) to its sub-
> > make.  However, there could be different ways in which the environment
> > is wrong.
> >
> > If you have the ability, it would be helpful if you could apply the
> > attached patch to your build of GNU Make and try the build again, and
> > let me know which of these different messages are generated right
> > before the above error >
> I'll be able to do that later today.

I applied the patch to 4.4.0.91 and ran 'make -j13 check' in my TeX Live 
build directory, which is /home/kbrown/src/texlive/test.x86_64/Work. 
The warning occurs almost immediately, before any tests are run:

Making check in .
make[1]: Entering directory '/home/kbrown/src/texlive/test.x86_64/Work'
make[1]: Leaving directory '/home/kbrown/src/texlive/test.x86_64/Work'
Making check in doc
make[1]: Entering directory '/home/kbrown/src/texlive/test.x86_64/Work/doc'
make[1]: Nothing to be done for 'check'.
make[1]: Leaving directory '/home/kbrown/src/texlive/test.x86_64/Work/doc'
Making check in texk/kpathsea
make[1]: Entering directory 
'/home/kbrown/src/texlive/test.x86_64/Work/texk/kpathsea'
make  check-recursive
make[2]: Entering directory 
'/home/kbrown/src/texlive/test.x86_64/Work/texk/kpathsea'
Making check in .
make[3]: Entering directory 
'/home/kbrown/src/texlive/test.x86_64/Work/texk/kpathsea'
make  check-TESTS
make[4]: Entering directory 
'/home/kbrown/src/texlive/test.x86_64/Work/texk/kpathsea'
make[5]: Entering directory 
'/home/kbrown/src/texlive/test.x86_64/Work/texk/kpathsea'
make[5]: not recursive -2,-2
make[5]: warning: jobserver unavailable: using -j1.  Add '+' to parent 
make rule.

> > It would also be very helpful if someone could provide me with the
> > complete rule that the parent make uses to invoke the sub-make, where
> > that message appears.  And, if you can include the output that make
> > generates to invoke the submake (the command it prints) that would be
> > excellent as well.

I'm not sure how to sort that out, but I'm attaching the top-level 
Makefile as well as the one in texk/kpathsea in the hope that you can 
figure out what's going on.

Ken

Makefile.kpathsea
Description: Text document

Makefile.top
Description: Text document