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a75076f271
GCC 7.0.1 can determine if there is likely to be sufficient space in
the output buffer when using sprintf/snprintf, based on the format
string.
The errors were all either of this form:
bindtests.c:717:29: error: '%zu' directive output may be truncated writing between 1 and 19 bytes into a region of size 16 [-Werror=format-truncation=]
snprintf (strs[i], 16, "%zu", i);
^~~
bindtests.c:717:28: note: directive argument in the range [0, 2305843009213693951]
snprintf (strs[i], 16, "%zu", i);
^~~~~
or this form:
sync.c: In function 'fsync_devices':
sync.c:108:50: error: '%s' directive output may be truncated writing up to 255 bytes into a region of size 251 [-Werror=format-truncation=]
snprintf (dev_path, sizeof dev_path, "/dev/%s", d->d_name);
^~
Fixed by converting these into dynamic allocation, or making the
output buffer larger, whichever was easier.
There is a gnulib macro we can use to make this simpler for integers.
It requires a new gnulib module (intprops), but it turns out that we
were already pulling that in through dependencies, so the change to
bootstrap is a no-op. (thanks: Dan Berrange)