[Bug c++/81586] valgrind error in output_buffer_append_r with -Wall

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81586

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-07-27
                 CC|                            |marxin at gcc dot gnu.org,
                   |                            |msebor at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, following patch will be needed:

diff --git a/gcc/gimple-ssa-sprintf.c b/gcc/gimple-ssa-sprintf.c
index 644cf7e33b1..72ec10a77b9 100644
--- a/gcc/gimple-ssa-sprintf.c
+++ b/gcc/gimple-ssa-sprintf.c
@@ -2500,7 +2500,7 @@ maybe_warn (substring_loc &dirloc, source_range
*pargrange,
                  : G_("%<%.*s%> directive writing %wu bytes "
                       "into a region of size %wu")));
          return fmtwarn (dirloc, pargrange, NULL,
-                         info.warnopt (), fmtstr, dir.len,
+                         info.warnopt (), fmtstr, MIN (dir.len, 31),
                          target_to_host (hostdir, sizeof hostdir, dir.beg),
                          res.min, navail);
        }

I'm not sure about the constant (maybe 32) and there are multiple invocations
of the fmtwarn function. Leaving to Martin.