Re: Fwd: Using select in boolean dependents of a tristate symbol

From: Roman Zippel
Date: Wed Jul 26 2006 - 20:40:18 EST


On Wed, 19 Jul 2006, Dmitry Torokhov wrote:

> Another question for you - what is the best way to describe
> dependancy of a sub-option on a subsystem so you won't end up with the
> subsystem as a module and user built in. Something like
> config IBM_ASM
> tristate "Device driver for IBM RSA service processor"
> depends on X86 && PCI && EXPERIMENTAL
> ...
> config IBM_ASM_INPUT
> bool "Support for remote keyboard/mouse"
> depends on IBM_ASM && (INPUT=y || INPUT=IMB_ASM)
> But the above feels yucky. Could we have something like:
> depends on matching(INPUT, IBM_ASM)

This is not really descriptive of what it does, is it?
Linus suggested a syntax like (IBM_ASM && IMB_ASM<=INPUT)
Another alternative which works now is to just disable the one invalid
case explicitely:

depends on IBM_ASM && INPUT
depends on !(IBM_ASM=y && INPUT=m)

bye, Roman
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