diff options
Diffstat (limited to 'gcc/gimple-fold.c')
| -rw-r--r-- | gcc/gimple-fold.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/gcc/gimple-fold.c b/gcc/gimple-fold.c index a01bce7..b025935 100644 --- a/gcc/gimple-fold.c +++ b/gcc/gimple-fold.c @@ -2051,10 +2051,12 @@ gimple_fold_builtin_strncat (gimple_stmt_iterator *gsi) if (!nowarn && cmpsrc == 0) { tree fndecl = gimple_call_fndecl (stmt); - - /* To avoid certain truncation the specified bound should also - not be equal to (or less than) the length of the source. */ location_t loc = gimple_location (stmt); + + /* To avoid possible overflow the specified bound should also + not be equal to the length of the source, even when the size + of the destination is unknown (it's not an uncommon mistake + to specify as the bound to strncpy the length of the source). */ if (warning_at (loc, OPT_Wstringop_overflow_, "%G%qD specified bound %E equals source length", stmt, fndecl, len)) |