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

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

Hi Tom,

On Tue, 2018-04-03 at 16:49 -0400, Tom Rini wrote:
> On Tue, Apr 03, 2018 at 08:27:20PM +0000, Alexey Brodkin wrote:
> > 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.
> 
> OK.  But this patch doesn't work and we're trying -fstack-usage is the
> problem I see :)

Well probably I'm missing something :)

Here's a TravisCI job for ARC that passes perfectly fine:
https://travis-ci.org/abrodkin/u-boot/jobs/362026822

Stuff that is built there is here:
https://github.com/abrodkin/u-boot/commits/staging-arc

Basically it's:
 * v2018.05-rc1 +
 * My last PR (tags/arc-for-2018.05) +
 * [This] "disable stack-usage" patch

------------------------>8------------------------
# git log --oneline
7917ac883723 Makefile: Disable stack-usage check for ARC
9fe2b77b313b ARC: HSDK: Enable SPI flash support
11007a25b835 ARC: HSDK: Add platform-specific commands
416c03d2f09f ARC: Bump ARC tools used in TravisCI to the most recent release arc-2017.09
94f247d0c145 ARC: AXS10x: DTS: Remove unused interrupt properties
645b5afbb821 (tag: v2018.05-rc1, mainline/master) Prepare v2018.05-rc1
------------------------>8------------------------

-Alexey