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Commitf38a0bd

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Suppress variable-set-but-not-used warnings from clang 15.
clang 15+ will issue a set-but-not-used warning when the onlyuse of a variable is in autoincrements (e.g., "foo++;").That's perfectly sensible, but it detects a few more cases thatwe'd not noticed before. Silence the warnings with our usualmethods, such as PG_USED_FOR_ASSERTS_ONLY, or in one case byactually removing a useless variable.One thing that we can't nicely get rid of is that with %pure-parser,Bison emits "yynerrs" as a local variable that falls foul of thiswarning. To silence those, I inserted "(void) yynerrs;" in thetop-level productions of affected grammars.Per recently-established project policy, this is a candidatefor back-patching into out-of-support branches: it suppressesannoying compiler warnings but changes no behavior. Hence,back-patch to 9.5, which is as far as these patches go withoutissues. (A preliminary check shows that the prior branchesneed some other set-but-not-used cleanups too, so I'll leavethem for another day.)Discussion:https://postgr.es/m/514615.1663615243@sss.pgh.pa.us
1 parentadc26e0 commitf38a0bd

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6 files changed

+9
-6
lines changed

6 files changed

+9
-6
lines changed

‎src/backend/access/gist/gistxlog.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -81,7 +81,7 @@ gistRedoPageUpdateRecord(XLogReaderState *record)
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char*begin;
8282
char*data;
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Sizedatalen;
84-
intninserted=0;
84+
intninsertedPG_USED_FOR_ASSERTS_ONLY=0;
8585

8686
data=begin=XLogRecGetBlockData(record,0,&datalen);
8787

‎src/backend/access/transam/xlog.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2106,7 +2106,7 @@ AdvanceXLInsertBuffer(XLogRecPtr upto, bool opportunistic)
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XLogRecPtrNewPageEndPtr=InvalidXLogRecPtr;
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XLogRecPtrNewPageBeginPtr;
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XLogPageHeaderNewPage;
2109-
intnpages=0;
2109+
intnpagespg_attribute_unused()=0;
21102110

21112111
LWLockAcquire(WALBufMappingLock,LW_EXCLUSIVE);
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‎src/backend/parser/gram.y

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -789,6 +789,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
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stmtblock:stmtmulti
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{
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pg_yyget_extra(yyscanner)->parsetree = $1;
792+
(void)yynerrs;/* suppress compiler warning*/
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}
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;
794795

‎src/backend/utils/adt/array_typanalyze.c

Lines changed: 1 addition & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -218,7 +218,6 @@ compute_array_stats(VacAttrStats *stats, AnalyzeAttrFetchFunc fetchfunc,
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{
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ArrayAnalyzeExtraData*extra_data;
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intnum_mcelem;
221-
intnull_cnt=0;
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intnull_elem_cnt=0;
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intanalyzed_rows=0;
224223

@@ -322,8 +321,7 @@ compute_array_stats(VacAttrStats *stats, AnalyzeAttrFetchFunc fetchfunc,
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value=fetchfunc(stats,array_no,&isnull);
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if (isnull)
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{
325-
/* array is null, just count that */
326-
null_cnt++;
324+
/* ignore arrays that are null overall */
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continue;
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}
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‎src/backend/utils/adt/jsonpath_gram.y

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -128,6 +128,7 @@ result:
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*result = palloc(sizeof(JsonPathParseResult));
129129
(*result)->expr =$2;
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(*result)->lax =$1;
131+
(void)yynerrs;
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}
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|/* EMPTY*/{ *result =NULL; }
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;

‎src/bin/pgbench/exprparse.y

Lines changed: 4 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -79,7 +79,10 @@ static PgBenchExpr *make_case(yyscan_t yyscanner, PgBenchExprList *when_then_lis
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%%
8181

82-
result:expr{ expr_parse_result =$1; }
82+
result:expr{
83+
expr_parse_result =$1;
84+
(void)yynerrs;/* suppress compiler warning*/
85+
}
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8487
elist:{$$ =NULL; }
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|expr{$$ = make_elist($1,NULL); }

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