[U-Boot] [PATCH] Makefile: Disable stack-usage check for ARC

[Alexey Brodkin <Alexey.Brodkin@synopsys.com>]

Hi Tom,

On Tue, 2018-04-03 at 16:25 -0400, Tom Rini wrote:
> On Tue, Apr 03, 2018 at 08:21:06PM +0000, Alexey Brodkin wrote:
> > Hi Tom,
> > 
> > On Tue, 2018-04-03 at 16:17 -0400, Tom Rini wrote:
> > > On Mon, Apr 02, 2018 at 12:18:02PM +0300, Alexey Brodkin wrote:
> > > 
> > > > With the most recent tools for ARC (arc-2017.09) in case of
> > > > "naked" function compiler throws a warning:
> > > > ---------------------------------->8-----------------------------
> > > > board/synopsys/hsdk/hsdk.c: In function 'hsdk_core_init_f':
> > > > board/synopsys/hsdk/hsdk.c:345:1: warning: stack usage computation not supported for this target
> > > >  }
> > > >  ^
> > > > ---------------------------------->8-----------------------------
> > > > 
> > > > That happens because the compiler doesn't handle "naked" functions
> > > > as a special case where stack calculation shouldn't be done.
> > > > 
> > > > But for now until this is fixed in GCC to get clean buildman output
> > > > we're disabling stack-usage check for ARC.
> > > > 
> > > > See https://lists.denx.de/pipermail/u-boot/2018-April/324455.html
> > > > for more background.
> > > > 
> > > > Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
> > > > Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
> > > > Cc: Tom Rini <trini@konsulko.com>
> > > 
> > > Erm, this patch isn't working for me.  I take the current ARC PR, and
> > > apply this, and I still see the warning showing up.
> > 
> > How do you see an issue?
> > Could you please make sure arc-2017.09 tools are used but not arc-2016.09?
> > See my change for TravisCI in the same PR.
> 
> ... but the patch here is disabling -fstack-usage altogether for ARC,
> yes?

Right, but that's a temporary "patch" for the problem in hand.
Once GCC 8.x gets released we'll just switch to it and that problem shouldn't
bother us any longer.

-Alexey