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posix: Suppress -Os may be used uninitialized warnings on regexec

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GCC with -Os issues may uninitialized warnings on regexec code.

Checked on x86_64-linux-gnu and i686-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella Netto 2022-09-21 10:51:05 -03:00 committed by Adhemerval Zanella
parent 9ec1c8cd24
commit 442e3a2172
1 changed files with 6 additions and 0 deletions
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6
posix/regexec.c
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@ -3768,7 +3768,13 @@ check_node_accept_bytes (const re_dfa_t *dfa, Idx node_idx,
_NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_EXTRAMB);
for (i = 0; i < cset->ncoll_syms; ++i)
{
/* The compiler might warn that extra may be used uninitialized,
however the loop will be executed iff ncoll_syms is larger
than 0,which means extra will be already initialized. */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_Os_NEEDS_COMMENT (8, "-Wmaybe-uninitialized");
const unsigned char *coll_sym = extra + cset->coll_syms[i];
DIAG_POP_NEEDS_COMMENT;
/* Compare the length of input collating element and
the length of current collating element. */
if (*coll_sym != elem_len)