Re: Make 3.81 and 3.82 break on parallel build

[Kamil Mierzejewski]

There are some issues filed describing similar behavior:
http://savannah.gnu.org/bugs/?31847
http://savannah.gnu.org/bugs/?26893
http://savannah.gnu.org/bugs/?30653

The last one has two patches attached. One of them is mine.

Dnia 17 listopad 2011 00:57:11 Paul Smith pisze:
> On Wed, 2011-11-16 at 17:35 -0600, David Hagood wrote:
> > On Wed, 2011-11-16 at 17:02 -0500, Paul Smith wrote:
> > > On Wed, 2011-11-16 at 15:40 -0600, address@hidden wrote:
> > > > > Try running the parallel version with -d (redirect the output because
> > > > > it's voluminous) and see what make says about trying to build
> > > > > somedir/libfoo.so: what does it say about the somedir/libbar.so
> > > > > prerequisite?
> > > > That it does not exist, so it fails. But if run not-parallel, it
> > > > correctly identifies it must be built first.
> > >
> > > ?? You mean _make_ says the file doesn't exist and so make fails?  Or
> > > the linker says it doesn't exist and the linker fails?
> > The linker is run, and fails. However, the -d -p output says that Make
> > is fully aware the prereq does not exist, but for some reason decides
> > that doesn't matter. The output ALSO clearly shows that make knows the
> > prereq must BE made. It's like the scheduling of what rules to run next
> > gets out sync.
>
> Hm.  Strange.
>
> The only time I've seen anything like that happen is due to unexpected
> interactions between make's "rebuild included makefiles" operation
> failing and normal builds.
>
> You can try getting the latest version of GNU make out of CVS and
> building it (you'll need autotools and other stuff installed: see the
> README.cvs file once you get a copy) to see if that works any better.
>
> Other than that, I don't think I can help much more without a
> reproducible test case.  In particular I wonder how you've configured
> your auto-generated prerequisites to work.
>
>
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Kamil Mierzejewski
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