Re: PATCH: Support "-march=armv6j", not "-march=armv6"

[Richard Earnshaw <rearnsha at arm dot com>]

> 
> This patch makes GAS match GCC with respect to the V6 "-march="
> option.  GCC spells it "-march=armv6j", so now so does GAS.
> 
> It's my understand that all V6 cores have the Jazelle extensions.
> Still, It's possible that we should add "-march=armv6" as a synonym to
> both GCC and GAS.  Richard, do you have thoughts about that?

No, this isn't quite accurate.  All cores will have the ARM-state 
extensions required to support Jazelle (the bxj instruction).  But not all 
cores are required to support Jazelle itself (direct interpretation of the 
java byte-codes).  Indeed, ARM has already announced arm11 cores that do 
not contain Jazelle.

So there really is a distinction between a v6 and a v6j implementation -- 
it just so happens that the distinctions are irrelevant in the assembler 
(and the compiler).

I think the above is sufficient justification, however, for us to support 
both v6 and v6j options in the tools.

R.