[gentoo-dev] Declare the type of source

[Agostino Sarubbo]

Hello all,

long story short:

when there is a major change (new gcc, new libc, and so on), tinderbox takes a 
lot of time to test the entire tree.

Let's do a practical example: 
A new version of sys-devel/gcc is added to the tree.

There is no way to know how much packages compiles C/C++ code, so the easiest 
way is compile the entire tree.

Instead, imagine that each ebuild declares a variable called SOURCETYPE ( or 
similar, or in metadata.xml if you prefer ) and with a tool like equery/eix we 
are able to get the list of all packages that compiles C code.

The same thing applies to other languages like python, ruby, go and so on 
where compile the dev-$language category covers a lot of packages, but there 
will be always other ebuilds that uses $language in other categories.

What do you think?

Agostino