[FTBFS] lxc build fails due to gcc-7

[Tiago Stürmer Daitx]

Currently lxc FTBFS due to a GCC-7 bug.

There's a upstream report for gcc-7 [1], but meanwhile lxc upstream has applied a workaround that fixes the build [1].

cgroups/cgfsng.c: In function ‘cgfsng_create’:
cgroups/cgfsng.c:1381:23: error: ‘__builtin___snprintf_chk’ output may be truncated before the last format character [-Werror=format-truncation=]
   snprintf(offset, 5, "-%d", idx);
                       ^~~~~
In file included from /usr/include/stdio.h:938:0,
                 from cgroups/cgfsng.c:44:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:64:10: note: ‘__builtin___snprintf_chk’ output between 3 and 6 bytes into a destination of size 5
   return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        __bos (__s), __fmt, __va_arg_pack ());
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78969
[2] https://github.com/lxc/lxc/commit/66b66624fce21606d11f24f5b615776074d212ae

[Launchpad Janitor (janitor)]

This bug was fixed in the package lxc - 2.0.8-0ubuntu5

---------------
lxc (2.0.8-0ubuntu5) artful; urgency=medium

  * debian/patches/0012-gcc-7-workaround.patch: workaround for gcc-7 bug
    that causes lxc to FTBFS. LP: #1711449. Closes: #853531.

 -- Tiago Stürmer Daitx <email address hidden> Thu, 17 Aug 2017 20:29:29 +0000