Re: Intermittent parallel make rebuild failures

[David Highley]

"Edward Welbourne wrote:"
> 
> > it appears from running make with the debug option that the
> > top level make does not see the object file created by the lower level
> > make in the time when it checks the dependencies for the library.
> 
> sounds a *lot* like an issue with make's caching of stat information;
> if the uppper make has looked, before the lower makes them, for files
> the lower makes, then its cached information about these files is
> still in place telling it they're missing even after the lower has
> made them.

Every time the subject of cache comes up its because they are always
wrong.

> That this only happens in parallel builds suggests that, while the
> lower make is at work, the upper is attempting to get on with things
> that actually depend on the lower.  So you may find that making
> completion of the lower a prerequisite of the rules that are being
> broken will help.
> 
>       Eddy.
>