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Suppress new "may be used uninitialized" warning.

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Various buildfarm members, having compilers like gcc 8.5 and 6.3, fail
to deduce that text_substring() variable "E" is initialized if
slice_size!=-1.  This suppression approach quiets gcc 8.5; I did not
reproduce the warning elsewhere.  Back-patch to v14, like commit
9f4fd119b2cbb9a41ec0c19a8d6ec9b59b92c125.

Reported-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/1157953.1771266105@sss.pgh.pa.us
Backpatch-through: 14
This commit is contained in:
Noah Misch
2026-02-16 18:04:58 -08:00
parent a6f823e778
commit 8cef93d8a5
1 changed files with 2 additions and 2 deletions
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4
src/backend/utils/adt/varlena.c
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@ -665,14 +665,14 @@ text_substring(Datum str, int32 start, int32 length, bool length_not_specified)
if (length_not_specified) /* special case - get length to end of
* string */
slice_size = L1 = -1;
E = slice_size = L1 = -1;
else if (length < 0)
{
/* SQL99 says to throw an error for E < S, i.e., negative length */
ereport(ERROR,
(errcode(ERRCODE_SUBSTRING_ERROR),
errmsg("negative substring length not allowed")));
slice_size = L1 = -1; /* silence stupider compilers */
E = slice_size = L1 = -1; /* silence stupider compilers */
}
else if (pg_add_s32_overflow(S, length, &E))
{