Re: [PATCH] crypto: arm: workaround for building with old binutils

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

> On 11 apr. 2015, at 10:55, Arnd Bergmann <arnd@arndb.de> wrote:
> 
>> On Saturday 11 April 2015 09:41:08 Ard Biesheuvel wrote:
>> Could you perhaps put the rules that build these modules inside a
>> 
>> ifneq ($(armv8-ce-flags),-DARMV8_CE_DISABLED)
>> ...
>> endif
> 
> How about something like this:
> 
> ifeq ($(call as-option,-Wa$(comma)-mfpu=crypto-neon-fp-armv8),)
> $(warning ARMv8 Crypto Extensions need binutils 2.23 or higher)
> else
> ...
> endif
> 
> That would basically be a reimplementation of the missing "as-option-yn"
> macro though, so we could also add that instead and do
> 
> ifeq ($(call as-option-yn,-Wa$(comma)-mfpu=crypto-neon-fp-armv8),y)
> $(warning ARMv8 Crypto Extensions need binutils 2.23 or higher)
> else
> ...
> endif
> 

Yes, that should work. Could we also move the CE objs to ce-obj-$() and put

ifneq ($(ce-obj-y)$(ce-obj-m),)
if <as check>
obj-y += $(ce-obj-y)
obj-m += $(ce-obj-m)
else
$(warning ...)
endif
endif

around it so you only get the warning if you have selected any of these modules?

In any case, I strongly prefer to leave the .S files themselves alone if at all possible

Ard.