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Re: Building cvs emacs on a dual-core machine

From: Eli Zaretskii
Subject: Re: Building cvs emacs on a dual-core machine
Date: Wed, 20 Dec 2006 20:54:15 +0200

> 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.

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.

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