[Debian-med-packaging] Bug#812011: snap: FTBFS with GCC 6: self-comparison always evaluates

[Sascha Steinbiss]

Hi all,

I have committed a fix for this to SVN. This required changing the (likely buggy) behaviour of the zoeHSPCmpQuery and zoeHSPCmpSbjct functions to do the correct comparisons.
The patched version builds for me now with the unstable gcc and gcc-6 from experimental.

Cheers
Sascha


On Tue, 19 Jan 2016 20:29:47 -0800 Martin Michlmayr <tbm at hpe.com> wrote:
> Package: snap
> Version: 2013-11-29-1
> Severity: important
> User: debian-gcc at lists.debian.org
> Usertags: ftbfs-gcc-6
> 
> This package fails to build with GCC 6.  GCC 6 has not been released
> yet, but it's expected that GCC 6 will become the default compiler for
> stretch.
> 
> Note that only the first error is reported; there might be more.  You
> can find a snapshot of GCC 6 in experimental.  To build with GCC 6,
> you can set CC=gcc-6 CXX=g++-6 explicitly.
> 
> You may be able to find out more about this issue at
> https://gcc.gnu.org/gcc-6/changes.html
> 
> > sbuild (Debian sbuild) 0.67.0 (26 Dec 2015) on dl580gen9-02.hlinux
> ...
> > gcc -O2 -Wall -Werror -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -c -o zoeAlignment.o zoeAlignment.c
> > zoeAlignment.c: In function ‘zoeHSPCmpQuery ':
> > zoeAlignment.c:678:50: error: self-comparison always evaluates to false [-Werror=tautological-compare]
> >   else if (h1->q_start > h2->q_start && h2->q_end > h2->q_end) return  1;
> >                                                   ^
> > 
> > zoeAlignment.c: In function 'zoeHSPCmpSbjct':
> > zoeAlignment.c:684:50: error: self-comparison always evaluates to false [-Werror=tautological-compare]
> >   else if (h1->s_start > h2->s_start && h2->s_end > h2->s_end) return  1;
> >                                                   ^
> > 
> > cc1: all warnings being treated as errors
> > Makefile:110: recipe for target 'zoeAlignment.o' failed
> 
> -- 
> Martin Michlmayr
> Linux for HPE Helion, Hewlett Packard Enterprise
> 
>