[PATCH] ARM: makefile: work around toolchain bug in recent versions of binutils

[Arnaud Patard (Rtp)]

Will Deacon <will.deacon at arm.com> writes:

> On Thu, Aug 02, 2012 at 07:18:10PM +0100, Russell King - ARM Linux wrote:
>> On Thu, Aug 02, 2012 at 04:51:41PM +0100, Will Deacon wrote:
>> > On Thu, Aug 02, 2012 at 04:30:30PM +0100, Russell King - ARM Linux wrote:
>> > > It might just be easier to specify something like -march=armv4 or
>> > > something like that, and then use .arch armv6 where required.
>> > 
>> > We could do that, but I worry that it will become very messy if/when people
>> > start adding things like virtualisation instructions (hvc and co) to the
>> > entry code. Using the same march flag for kernel and decompressor also keeps
>> > everything consistent.
>> 
>> But you're missing a fundamental point: the decompressor is not designed
>> to be built like that, it is designed to be built in such a way that it
>> works unmodified on any CPU type we have to date, whether you're building
>> a kernel for ARMv4 or ARMv7.
>> 
>> So, the code sequences which are architecture specific are only executed
>> after we've checked the ID registers to determine what we should be doing
>> for a particular CPU.
>
> That's fine, *if* we can persuade the tools to build the thing for us. With
> march=all, we got what we wanted but now that doesn't seem to work anymore.
>

and we already had to fix -march=all in the past :
http://sourceware.org/bugzilla/show_bug.cgi?id=12698

So maybe would be easier to try to fix it instead of trying to
workaround it ?

Arnaud