Hi devs,

About a year ago, I set out trying to get rid of *all* compiler warnings
on a "well-defined" build platform.  I'm happy to report that we've made
it!  With the commit of ee550e5d[1], the debian-8-full build[2], is free
of compiler warnings!

 [2] https://gitlab.com/sane-project/backends/builds/4218963

Looking over the build log (love how clean those compile commands look,
BTW), next are four linker warnings about the use of `mktemp`, which, as
we all know, is racey and should be avoided.  Like the plague, so I'd
like to see these get fixed.

# I have a patch for the avision backend already.  By all means, tackle
# any of the canon, canon_dr and dc25 backends' use of mktemp.

There are still a number of description file entries looking for USB
product IDs and interfaces.  I added several in 1a328e41[3] based on
what's in the Linux USB IDs list[4] and will fix the typo I introduced
in a jiffy.  I don't think it's realistic to get all of these fixed but
if you're willing (here's wishing the hpaio folks are listening in!) to
take a look, be my guest.

 [4] http://www.linux-usb.org/usb.ids

The debian-8-mini build[5] is relatively clean, just a few minor things
due to the intentional lack of *any* libraries.  The alpine-3.4.-musl
build[6] hints at portability problems in the threading and parallel
port areas.

 [5] https://gitlab.com/sane-project/backends/builds/4218962
 [6] https://gitlab.com/sane-project/backends/builds/4218964

The fedora-24-clang build[7]?  Let's leave that for another time.  Much
of what you see there will pop up with gcc-6.x as well (which will be in
Debian 9, rumoured to release sometime early next year, IIRC).

 [7] https://gitlab.com/sane-project/backends/builds/4218965

Seeing that debian-8-full now builds without compiler warnings, I am
going to keep it that way by adding a CFLAGS="-Werror" to the `make`
invocation of the build.  Remember: AWARE[8].


Oh and BTW, Debian released 8.6 last weekend so the Docker image used
for the debian-8-* builds will be updated some time soon as well.

Hope this helps,
Olaf Meeuwissen, LPIC-2            FSF Associate Member since 2004-01-27
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