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posix: Suppress -Os warnings on fnmatch 

GCC with -Os issues some may uninitialized warnings on fnmatch code.
All of the variables are already set when they are accessed on the
loop prior.

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 10:51:04 -03:00 committed by Adhemerval Zanella
parent c651f9da53
commit 9ec1c8cd24
1 changed files with 31 additions and 0 deletions
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31
posix/fnmatch_loop.c
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@ -530,6 +530,14 @@ FCT (const CHAR *pattern, const CHAR *string, const CHAR *string_end,
{
/* Compare the byte sequence but only if
this is not part of a range. */
/* The compiler might warn that idx may be
used uninitialized, however it will be
reached iff elem < table_size which means
that it was properly set in the loop
above. */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_Os_NEEDS_COMMENT (8, "-Wmaybe-uninitialized");
if (! is_range
# if WIDE_CHAR_VERSION
@ -542,11 +550,19 @@ FCT (const CHAR *pattern, const CHAR *string, const CHAR *string_end,
n += c1 - 1;
goto matched;
}
DIAG_POP_NEEDS_COMMENT;
/* Get the collation sequence value. */
is_seqval = true;
# if WIDE_CHAR_VERSION
/* The compile might warn that wextra may be
used uninitialized and similar to 'idx'
above it will be properly set by the loop.
*/
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_Os_NEEDS_COMMENT (8, "-Wmaybe-uninitialized");
cold = wextra[1 + wextra[0]];
DIAG_POP_NEEDS_COMMENT;
# else
idx += 1 + extra[idx];
/* Adjust for the alignment. */
@ -723,9 +739,24 @@ FCT (const CHAR *pattern, const CHAR *string, const CHAR *string_end,
/* Get the collation sequence value. */
is_seqval = true;
# if WIDE_CHAR_VERSION
/* The compiler might warn that wextra may
be used uninitialized, however it will
be reached iff elem < table_size which
means that it was properly set in the
loop above. */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_Os_NEEDS_COMMENT (8, "-Wmaybe-uninitialized");
cend = wextra[1 + wextra[0]];
DIAG_POP_NEEDS_COMMENT;
# else
/* The compile might warn that idx may
be used uninitialized and similar to
wextra above it will be properly set by
the loop. */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_Os_NEEDS_COMMENT (8, "-Wmaybe-uninitialized");
idx += 1 + extra[idx];
DIAG_POP_NEEDS_COMMENT;
/* Adjust for the alignment. */
idx = (idx + 3) & ~3;
cend = *((int32_t *) &extra[idx]);