[U-Boot] [PATCH 2/2 RESEND] SPL: Allow user to disable CPU support library

[Scott Wood]

On 09/16/2011 04:47 PM, Marek Vasut wrote:
> On Friday, September 16, 2011 11:42:50 PM Scott Wood wrote:
>> On 09/16/2011 04:38 PM, Marek Vasut wrote:
>>> On Friday, September 16, 2011 09:49:28 PM Scott Wood wrote:
>>>> Still, this seems hackish.  Shouldn't the control be on specific files
>>>> that you include, not directories?
>>>
>>> I don't think so ... why ?
>>
>> That's how the main U-Boot build does it...  More specifically, the
>> config.h controls should be on features, and the makefiles should decide
>> which (if any) files are required for that feature.  If there are no
>> files from arch/$(ARCH)/cpu/$(CPU) needed, then we get an empty
>> lib$(CPU).o -- nothing special needed to avoid it.
> 
> Yes, but you basically _always_ want that CPU support code in ... and I have no 
> idea why you'd like to avoid particular files.

You have no idea why I'd like to be extremely selective with what I
include in a 4K binary?

It's not about avoiding particular files.  It's about including
*nothing* but what is explicitly asked for through some SPL-specific
CONFIG symbol.  Maybe that includes everything in arch/$(ARCH)/cpu.
Maybe it includes nothing in there.  More likely, it includes just a
fraction of it.

If your answer is gc-sections, why do you need to drop the whole
directory?  And why waste time building entire files that we know we
don't want?  Why waste time debugging where the sudden bloat came from
instead of getting a simple and clear undefined-symbol error?

-Scott