Bug#847397: libimager-perl FTBFS on mips/mipsel: Failed 10/66 test programs

[Tony Cook]

On Fri, Dec 09, 2016 at 01:01:01AM +0100, gregor herrmann wrote:
> On Fri, 09 Dec 2016 01:14:23 +0200, Niko Tyni wrote:
> 
> > TL;dr: this is https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78176
> 
> Oh.
>  
> > > > Otherwise a backtrace for a -g build from the crash would be handy:
> > > >   perl Makefile.PL OPTIMIZE=-g
> > It goes away without the default optimization level -O2.
> > 
> > On eller.debian.org, mipsel chroot, with OPTIMIZE="-g -O2":
> [..]
> 
> I think a want to book a workshop "gdb for harmless perl packagers"
> :)
>  
> > Unfortunately gcc doesn't seem to have a targeted option to disable this
> > optimization. Building with -O0 on mips and mipsel is probably the best
> > workaround we have (-O1 isn't enough.)
> 
> I now cam up with the following change to d/rules:
> 
> +# #847397
> +DEB_HOST_ARCH = $(shell dpkg-architecture -qDEB_HOST_ARCH)
> +NOOPT = mips mipsel amd64
> +ifneq (,$(filter $(DEB_HOST_ARCH), $(NOOPT)))
> +export DEB_CFLAGS_MAINT_STRIP:=-O2
> +export DEB_CFLAGS_MAINT_APPEND:=-O0
> +endif
> 
> (committed and pushed). Does this make sense (if I remove the
> debugging amd64 again, or course)?
> 

That certainly looks like a sensible workaround.

Is there some mechanism that will remove it if the gcc (or perhaps
kernel) bug is fixed?

Tony