Bug#853421: glib2.0: ftbfs with GCC-7

[Simon McVittie]

On Tue, 31 Jan 2017 at 09:31:40 +0000, Matthias Klose wrote:
> The full build log can be found at:
> http://people.debian.org/~doko/logs/gcc7-20170126/glib2.0_2.50.2-2_unstable_gcc7.log
> The last lines of the build log are at the end of this report.

... and are completely useless, because this is a heavily parallel build.

Here is the actually useful part:

/<<PKGBUILDDIR>>/./glib/gscanner.c: In function 'g_scanner_unexp_token':
/<<PKGBUILDDIR>>/./glib/gscanner.c:1469:61: error: '%.3f' directive output may be truncated writing between 5 and 314 bytes into a region of size 48 [-Werror=format-truncation=]
       _g_snprintf (token_string, token_string_len, "number '%.3f'", scanner->value.v_float);
                                                             ^~~~
In file included from /usr/include/stdio.h:938:0,
                 from /<<PKGBUILDDIR>>/./glib/gscanner.c:38:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:64:10: note: format output between 15 and 324 bytes into a destination of size 56
   return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        __bos (__s), __fmt, __va_arg_pack ());
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I don't know why "%.3f" % some_float can be 324 bytes long.

    S