Re: Building cvs emacs on a dual-core machine

[Eric Lilja]

Eli Zaretskii skrev:
> > From: Eric Lilja <address@hidden>
> > Date: Wed, 20 Dec 2006 12:47:13 +0100
> >
> > I recently upgraded my computer with a dual-core CPU. I've been enjoying 
> > nice decreases in compile time in my own projects by specifying --jobs=2 
> > when invoking make.
> >
> > However, when I tried that with emacs it started compiling, very fast 
> > with both cores busy, but the build craps out (sorry, no log) after a 
> > little while.
>
> Any such failures are bugs in the Emacs Makefiles, so please be sure
> to report them with full details, including the build log.

I will. This was with the cvs sources I downloaded yesterday (december 
19th). I have been trying a few times since the beginning of november 
(that's when I got the dual core cpu), neither have been able to build 
when specifying --jobs=2. I will do a fresh checkout later today and 
hopefully provided you with the details you need.

> If you didn't try this with the CVS version or with the latest
> pretest, please do try one of these, because many problems present in
> Emacs 21.x are already resolved in the latest development code.
>
> Thanks in advance.
>
> > Maybe because it tries to build something that depends on 
> > something else that has not been quite finished yet because when 
> > multiple jobs are specified things doesn't happen in serial anymore?
>
> A bug-free Makefile should never cause any such trouble, since all the
> dependencies are supposed to be spelled out in it, and Make will never
> start building a file until all its prerequisites are built.

- Eric