perl makefile race - any make experts who can help?


Richard Purdie
 

Hi,

Occasionally we see perl do_install failures on the autobuilder. It
looks like some kind of make race. With the last failure I saved off
the build directory and have spent a lot of time staring at it but I
don't understand how what the logs say happened actually happened.

The build failure is here:

https://autobuilder.yoctoproject.org/typhoon/#/builders/37/builds/5315/steps/11/logs/stdio

and you can see it failed in do_install. The first error is;

| Couldn't copy cpan/podlators/blib/script/pod2text to /home/pokybuild/yocto-worker/genericx86-64/build/build/tmp/work/core2-64-poky-linux/perl/5.34.1-r0/image/usr/bin/pod2text: No such file or directory
| Couldn't chmod 755 /home/pokybuild/yocto-worker/genericx86-64/build/build/tmp/work/core2-64-poky-linux/perl/5.34.1-r0/image/usr/bin/pod2text: No such file or directory

then

installman: Can't open cpan/podlators/blib/script/pod2text: No such file or directory
| ABORTED

Looking at the build directory, cpan/podlators/blib/script/pod2text
isn't there, cpan/podlators/script/pod2text is. I went digging in the
compile log which didn't fail but is interesting in what it doesn't say
nd the ordering. The full log:

https://autobuilder.yocto.io/pub/failed-builds-data/perl-race/log.do_compile.25823

or my edited down version:

https://autobuilder.yocto.io/pub/failed-builds-data/perl-race/compile-cutdown.log

and note it never actually builds cpan/podlators/blib/script/pod2text.

If I go into the failed build dir, it does build it:

https://autobuilder.yocto.io/pub/failed-builds-data/perl-race/manual-compile.log

I tried a few variations of deleting and rebuilding files there just to show behaviour.

The makefiles from the podlators directory:

https://autobuilder.yocto.io/pub/failed-builds-data/perl-race/Makefile
https://autobuilder.yocto.io/pub/failed-builds-data/perl-race/Makefile.PL


What really puzzles me is the "Manifying 2 pod documents" message
*before* it then generates scripts/pod2text from scripts/pod2text.PL in
the do_compile log. It appears to run the scripts/pod2text late and
never runs the $(INST_SCRIPT)/pod2text at all (hence no cp message and
the missing file).

The Makefile has default targets of pure_all and manifypods, that
message comes from manifypods but manifypods depends on pure_all.

pure_all is a double colon rule and I'm on less certain ground with how
those behave.

Are there any make experts out there who can spot the race in this
makefile?

Cheers,

Richard

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