On Sun, May 04, 2008 at 10:25:57AM -0700, Randy Dunlap wrote:
> Sam Ravnborg wrote:
>> On Sun, May 04, 2008 at 03:10:14PM +0300, Adrian Bunk wrote:
>>> On Sun, May 04, 2008 at 01:27:41PM +0200, Sam Ravnborg wrote:
>>>> On Sun, May 04, 2008 at 11:01:37AM +0300, Adrian Bunk wrote:
>>>>> On Sun, May 04, 2008 at 08:17:41AM +0200, Sam Ravnborg wrote:
>>>>>> On Sun, May 04, 2008 at 02:15:35AM +0300, Adrian Bunk wrote:
>>>>>>> This kconfig construct described here is required in a
>>>>>>> different and much more complicated situation.
>>>>>> Please elaborate...
>>>>> In the hint C is described as a tristate.
>>>>>
>>>>> But you need this idiom only when A is a tristate and C is a bool.
>>>> Thats another case.
>>>> What is described is following simple situation:
>>>>
>>>> config FOO
>>>> bool "Modules"
>>>> option modules
>>>>
>>>> config A
>>>> tristate "a"
>>>>
>>>> config B
>>>> tristate "b"
>>>> depends on A
>>>>
>>>> config C
>>>> tristate "c"
>>>> depends on B
>>>> depends on A = y || A = B
>>>>
>>>>
>>>> C uses a symbol defined by A - let us name it foo().
>>>> If C is build-in and A is a module => link error - unable to
>>>> resolve foo.
>>>>
>>>> So we say: if A is buildin C may be built-in or module.
>>>> if A is a module C may not be built-in.
>>>>
>>>> This is what this hint describes.
>>> In your example C does not need any dependency on A at all since it
>>> is already handled through the dependency chain C->B->A.
>>
>> You are right.
>> Randy - what problem was it this text tried to describe/solve?
>
> I thought that it was related to USB_STORAGE, but I don't find it
> in current kernels.
>
> If the text is misleading, it should be yanked, of course.
> And other places checked, e.g.:
>...
The idiom has use cases, but you need the following prerequisites:
- A and B are tristates
- B does not depend on A
- C is a bool with the semantics "enable feature C in B"
And I doubt you can put that into a useful hint.
> ~Randy
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
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