bug#17614: parallel compilation fails

[Mike Frysinger]

On 21 Feb 2022 12:15, Peter Johansson wrote:
> On 25/1/22 16:24, Mike Frysinger wrote:
> > On 19 Jan 2022 18:32, Peter Johansson wrote:
> >> On 19/1/22 18:10, Mike Frysinger wrote:
> >>> assuming it still fails with Automake 1.16 ...
> >>
> >> I'll test when I'm out of this semi-lockdown and have access to a
> >> computer with more CPUs.
> >>
> >>> can you link to the project for us to take a look ?
> >> Tar file is available from here
> >>
> >> https://sourceforge.net/projects/libyat/
> >>
> >> and subversion repo from here if that's preferable
> >>
> >> https://dev.thep.lu.se/yat/svn/trunk
> > i grabbed the 0.19 release.  perhaps unsurprising, nothing stood out to me
> > related to the error above.  you didn't have any recursive makes or any code
> > that seemed to override the dep generation or create conflicting outputs.
> >
> > if you can reproduce it, get a full log and send it over, and include the
> > config.log file i think.  something like `make -O -j... >& log`.
> >
> > the error you quoted is part of automake's dependency generation.  it's very
> > weird that you'd get an error about .Tpo & .Plo being the same file when the
> > rule that creates them creates the .Tpo then moves it to .Plo.  there is no
> > place where we ever write to .Plo otherwise.
> 
> I've tried this now and in short I cannot reproduce it. I tried with 
> Automake 1.13 now (bcs it's what available by default) and ran both on 
> current code and an older branch, but nothing that looks like this. Many 
> things have changed since 2014 when this was filed and I think for 
> example that the file system was much slower back then. I suspect that 
> the problem was that the same file was compiled twice, but since I can't 
> reproduce it, it's impossible to determine whether it was due to 
> problematic Makefile.am, generated Makefile, or possibly behaviour of 
> make, so if not already closed, please close this and I'll report back 
> if something similar returns.

np.  feel free to ping/reopen if something does turn up.
-mike

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