Multiple arguments to CONFIG_SITE

[Ross Burton]

Hi,

One of the patches we do carry that I'd like to see upstreamed is the 
support for multiple files in CONFIG_SITE.  Now I'm not just sending the 
patch we have as it's pretty horrible:

http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/recipes-devtools/autoconf/autoconf/config_site.patch

The use-case is that we have a collection of config.site files: one for 
"all builds", one for "all Linux targets", one for "x86-64 targets", and 
so on:

http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/site

(those have grown organically over many years so need a massive review, 
but that's the model)

However CONFIG_SITE only takes a single filename, so we patch autoconf 
to treat CONFIG_SITE as a list of absolute filenames instead.

I'd like to see this functionality upstreamed but I'd like to discuss 
how CONFIG_SITE is parsed first.  Should it just be treated as a 
space-separated list?  Any better suggestions?

Also note that there's potentially very bad interaction: if someone has 
done as the manual suggests and dropped a /usr/share/config.site in then 
that will be read when doing --prefix=/usr, *even in cross-compile 
situations* where /usr is a target prefix and not valid on the host. 
Then again this isn't exactly the first time autoconf has this problem.

Thanks,
Ross