My change to make limit_bad_template_recursion avoid instantiating members
of erroneous classes produced a bogus "used but not defined" warning for
23_containers/unordered_set/instantiation_neg.cc; it's not defined because
we decided not to instantiate it. So we need to suppress that warning.
Tested x86_64-pc-linux-gnu, applying to trunk.
gcc/cp/ChangeLog:
* pt.c (limit_bad_template_recursion): Suppress -Wunused for decls
we decide not to instantiate.
---
gcc/cp/pt.c | 26 +++++++++++++++++++-------
1 file changed, 19 insertions(+), 7 deletions(-)
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 72b22d8c487..1b81501386b 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -10890,15 +10890,27 @@ limit_bad_template_recursion (tree decl)
return false;
/* Avoid instantiating members of an ill-formed class. */
- if (DECL_CLASS_SCOPE_P (decl)
- && CLASSTYPE_ERRONEOUS (DECL_CONTEXT (decl)))
- return true;
+ bool refuse
+ = (DECL_CLASS_SCOPE_P (decl)
+ && CLASSTYPE_ERRONEOUS (DECL_CONTEXT (decl)));
- for (; lev; lev = lev->next)
- if (neglectable_inst_p (lev->maybe_get_node ()))
- break;
+ if (!refuse)
+ {
+ for (; lev; lev = lev->next)
+ if (neglectable_inst_p (lev->maybe_get_node ()))
+ break;
+ refuse = (lev && errs > lev->errors);
+ }
- return (lev && errs > lev->errors);
+ if (refuse)
+ {
+ /* Don't warn about it not being defined. */
+ suppress_warning (decl, OPT_Wunused);
+ tree clone;
+ FOR_EACH_CLONE (clone, decl)
+ suppress_warning (clone, OPT_Wunused);
+ }
+ return refuse;
}
static int tinst_depth;
base-commit: 943c65c4494145e993af43c821c82000013c6375
--
2.27.0
