Re: (toplevel) introduce host subdir configuration in Makefile

[Daniel Jacobowitz <drow@mvista.com>]

On Mon, Dec 02, 2002 at 03:44:21PM -0200, Alexandre Oliva wrote:
> One way to try to overcome this limitation in autoconf that has just
> occurred to me is to offload the updating of a shared config.cache to
> the top-level Makefile.  E.g., the Makefile safely copies the
> top-level config.cache to a subdirectory before it configures it, and
> safely copies it back (or merges it) with the top-level config.cache
> when configure finishes.  Safety can be accomplished with
> 
> cp ${cache_file} subdir/config.cache
> run configure in subdir, with --config-cache=./config.cache
> mv subdir/config.cache ${cache_file}
> 
> trying to merge the contents can get trickier, but I believe it can be
> done too.
> 
> The one thing we'd have to be careful about is in case the user
> specified a config.cache to the top-level, especially /dev/null.  We
> may have to handle that especially, like autoconf does.

Yeah, I think this would be the way to go; but in any case, I suggest
that we serialize configure targets if it's practical to do so.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer