Re: "has changed since the previous run"

[Ralf Wildenhues]

Hello Benoit,

* Benoit Sigoure wrote on Thu, Feb 01, 2007 at 05:04:48PM CET:
> Quoting Andreas Schwab <address@hidden>:
> >DJ Delorie <address@hidden> writes:
> >>They share config.cache, because it saves a lot of time.
> >
> >Not any more.  Nowadays every configured subdirectory gets its own cache.
> 
> This question is a bit off topic but I'd be interested in knowing why you
> changed this. I also have a big project in which sub-configures are
> conditionally picked up by the top-level configure and called during
> ``make all'' and they all share the same cache which speeds up
> significantly the build.

GCC does that (partly).  Doesn't apply to users of Autoconf's
AC_CONFIG_SUBDIRS.  If you use that, it will share the cache.

I assume that your project is not nearly as complex as GCC is
in terms of build machinery.  A combined tree has several dozen
configure scripts, and uses several fewer config.cache files,
i.e., there is some sharing.

Cheers,
Ralf