2013/2/8 Pietro Paolini <[email protected]>:
> These variables are simply passed at the other makefiles in the
> subdirectory or there are  other purpose of them ?
>
Some of them used by building system (e.g. CONFIG_PACKAGE_foo), the
rest of variables are used by particular package.

> Let's a package X be non selected, it will not be compiled because the
> Makefile of the X package see the CONFIG_PACKAGE_X=n or because it isn't
> called by the build system ?
>
If the package is not selected, then the Makefile will not even be called.

> There is a (short) paper where can I find answer for this type of
> questions ?
>
Start reading here [1]. Actually, google know yet more.

1. http://wiki.openwrt.org/doc/devel/packages

-- 
BR,
Sergey
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