Add const qualifiers where they are accidentally cast away

This only produces warnings under -Wcast-qual, but it's more correct
and consistent in any case.

3 files changed, 4 insertions, 4 deletions

diff --git a/src/backend/utils/adt/tsquery_util.c b/src/backend/utils/adt/tsquery_util.c
index 946caa50db4..ae00f180b5d 100644
--- a/src/backend/utils/adt/tsquery_util.c
+++ b/src/backend/utils/adt/tsquery_util.c
@@ -134,7 +134,7 @@ QTNodeCompare(QTNode *an, QTNode *bn)
 static int
 cmpQTN(const void *a, const void *b)
 {
-	return QTNodeCompare(*(QTNode **) a, *(QTNode **) b);
+	return QTNodeCompare(*(QTNode * const *) a, *(QTNode * const *) b);
 }
 
 void
diff --git a/src/backend/utils/adt/xml.c b/src/backend/utils/adt/xml.c
index c0ca3f8cec4..d7b637c1c43 100644
--- a/src/backend/utils/adt/xml.c
+++ b/src/backend/utils/adt/xml.c
@@ -311,7 +311,7 @@ xml_recv(PG_FUNCTION_ARGS)
 	str = VARDATA(result);
 	str[nbytes] = '\0';
 
-	parse_xml_decl((xmlChar *) str, NULL, NULL, &encodingStr, NULL);
+	parse_xml_decl((const xmlChar *) str, NULL, NULL, &encodingStr, NULL);
 
 	/*
 	 * If encoding wasn't explicitly specified in the XML header, treat it as
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index a5becbe8ff7..486bdcddef8 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -3780,8 +3780,8 @@ find_option(const char *name, bool create_placeholders, int elevel)
 static int
 guc_var_compare(const void *a, const void *b)
 {
-	struct config_generic *confa = *(struct config_generic **) a;
-	struct config_generic *confb = *(struct config_generic **) b;
+	const struct config_generic *confa = *(struct config_generic * const *) a;
+	const struct config_generic *confb = *(struct config_generic * const *) b;
 
 	return guc_name_compare(confa->name, confb->name);
 }