map is very good at generating rules.
Just map gen function to array of it's parameters.
Don't forget to eval the result.

I'll use it in feature-tests generation and in someday coming
compat 32-bit mode - in x86 makefiles.

Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>