[Buildroot] [PATCH v2] trousers: Pass "-mno-compact-casesi" when building for ARCv1

[Vlad Zakharov <Vladislav.Zakharov@synopsys.com>]

Hi Thomas,

On Fri, 2016-11-25 at 22:13 +0100, Thomas Petazzoni wrote:
> Hello,
> 
> On Tue, 22 Nov 2016 13:42:25 +0300, Vlad Zakharov wrote:
> > 
> > Compact casesi patterns don't have a reload version. This causes build
> > failures of "trousers" package for ARC.
> > 
> > Current patch disables compact casesi patterns for ARCv1 (750D and 770D)
> > via passing "-mno-compact-casesi" option when compiling "trousers".
> > 
> > This change is a temporary workaround and the feature is going to be
> > fixed in the next ARC toolchain release version.
> > 
> > Fixes:
> > http://autobuild.buildroot.org/results/d2c/d2c16d8ba022b070c4dbeba5e7ea41f14d706691//
> > 
> > Signed-off-by: Vlad Zakharov <vzakhar@synopsys.com>
> 
> We still have a build failure of the trousers package on ARC, see:
> 
> ? http://autobuild.buildroot.net/results/1e7/1e730465c79f50143b0ca2366a3c07ea5e8648b1/build-end.log
> 
> The failure is:
> 
> (jump_insn 34 262 35 5 (parallel [
> ????????????(set (pc)
> ????????????????(unspec:SI [
> ????????????????????????(reg:SI 14 r14 [165])
> ????????????????????] UNSPEC_ARC_CASESI))
> ????????????(use (label_ref 35))
> ????????????(clobber (scratch:SI))
> ????????]) tspi_context.c:145 130 {casesi_compact_jump}
> ?????(expr_list:REG_DEAD (reg:SI 14 r14 [165])
> ????????(nil))
> ?-> 35)
> tspi_context.c:325:1: internal compiler error: in find_reloads, at reload.c:3830
> Please submit a full bug report,
> with preprocessed source if appropriate.
> 
> Best regards,
> 
> Thomas

Thank you for sending us this observation.
I mentioned this SNAFU too and have already investigated the situation a bit.

This happens because either "-Os" overrides "-mno-compact-casesi" option or the latter option doesn't work at all.?
In any case we are working at the issue and will soon either provide some fix or send another workaround for "trousers"
package.?

Thanks.

-- 
Best regards,
Vlad Zakharov <vzakhar@synopsys.com>