Work around gcc9 warning bug

[Alan Modra]

On Sun, May 12, 2019 at 10:42:00AM -0400, Zack Weinberg wrote:
> On 30 Apr 2019, Alan Modra wrote:
> > * wrstabs.c (stab_start_class_type): Add assert to work around gcc9 warning.  Tidy.
> 
> Could you please backport this patch to the binutils 2.32 branch at
> least?

Done.  I'll note for the broader audience that binutils releases
default to --disable-werror.  If you're using binutils from git at
other than a release tag you should probably supply --disable-werror
to configure, unless you're interested in making the binutils sources
warning free.

>  The gcc9 warning is breaking glibc's "build-many-glibcs"
> automation for exhaustive cross-compilation testing.  As part of
> bootstrapping cross compilation environments, this builds a native gcc
> 9 and then tries to use it to build cross-binutils, currently from the
> 2.32 branch.

-- 
Alan Modra
Australia Development Lab, IBM