Suppress more variable-set-but-not-used warnings from clang 15.

Mop up assorted set-but-not-used warnings in the back branches.
This includes back-patching relevant fixes from commit 152c9f7b8
the rest of the way, but there are also several cases that did not
appear in HEAD.  Some of those we'd fixed in a retail way but not
back-patched, and others I think just got rewritten out of existence
during nearby refactoring.

While here, also back-patch b1980f6d0 (PL/Tcl: Fix compiler warnings
with Tcl 8.6) into 9.2, so that that branch compiles warning-free
with modern Tcl.

Per project policy, this is a candidate for back-patching into
out-of-support branches: it suppresses annoying compiler warnings
but changes no behavior.  Hence, back-patch all the way to 9.2.

Discussion: https://postgr.es/m/514615.1663615243@sss.pgh.pa.us

diff --git a/src/backend/optimizer/util/var.c b/src/backend/optimizer/util/var.c
index 1892ae93211f286009c026899b83eb4593050357..0a4f32e0c3843424c540a8fd4976dc1492e92c0c 100644 (file)
--- a/src/backend/optimizer/util/var.c
+++ b/src/backend/optimizer/util/var.c
@@ -773,16 +773,13 @@ flatten_join_alias_vars_mutator(Node *node,
                        RowExpr    *rowexpr;
                        List       *fields = NIL;
                        List       *colnames = NIL;
-                       AttrNumber      attnum;
                        ListCell   *lv;
                        ListCell   *ln;
 
-                       attnum = 0;
                        Assert(list_length(rte->joinaliasvars) == list_length(rte->eref->colnames));
                        forboth(lv, rte->joinaliasvars, ln, rte->eref->colnames)
                        {
                                newvar = (Node *) lfirst(lv);
-                               attnum++;
                                /* Ignore dropped columns */
                                if (newvar == NULL)
                                        continue;

diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index bad672f51b348fc5d2b72ebfd0fdf54bc0e0f9c1..4b747550ca013ed0dd865e356b996e5768e71c8c 100644 (file)
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -4206,7 +4206,6 @@ AttrDefaultFetch(Relation relation)
        HeapTuple       htup;
        Datum           val;
        bool            isnull;
-       int                     found;
        int                     i;
 
        ScanKeyInit(&skey,
@@ -4217,7 +4216,6 @@ AttrDefaultFetch(Relation relation)
        adrel = table_open(AttrDefaultRelationId, AccessShareLock);
        adscan = systable_beginscan(adrel, AttrDefaultIndexId, true,
                                                                NULL, 1, &skey);
-       found = 0;
 
        while (HeapTupleIsValid(htup = systable_getnext(adscan)))
        {
@@ -4232,8 +4230,6 @@ AttrDefaultFetch(Relation relation)
                                elog(WARNING, "multiple attrdef records found for attr %s of rel %s",
                                         NameStr(attr->attname),
                                         RelationGetRelationName(relation));
-                       else
-                               found++;
 
                        val = fastgetattr(htup,
                                                          Anum_pg_attrdef_adbin,