From 39004608e79b68fe7615a026ce58dea646dba20e Mon Sep 17 00:00:00 2001
From: Marek Polacek <polacek@redhat.com>
Date: Tue, 25 Jul 2023 14:36:47 -0400
Subject: [PATCH] c++: clear tf_partial et al in instantiate_template
[PR108960]
In <https://gcc.gnu.org/pipermail/gcc-patches/2023-February/612929.html>
we concluded that we might clear all flags except tf_warning_or_error
when performing instantiate_template.
PR c++/108960
gcc/cp/ChangeLog:
* pt.cc (lookup_and_finish_template_variable): Don't clear tf_partial
here.
(instantiate_template): Reset all complain flags except
tf_warning_or_error.
---
gcc/cp/pt.cc | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
index 21b08a6266a5..265e2a59a527 100644
--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -10396,12 +10396,6 @@ lookup_and_finish_template_variable (tree templ, tree targs,
tree var = lookup_template_variable (templ, targs, complain);
if (var == error_mark_node)
return error_mark_node;
- /* We may be called while doing a partial substitution, but the
- type of the variable template may be auto, in which case we
- will call do_auto_deduction in mark_used (which clears tf_partial)
- and the auto must be properly reduced at that time for the
- deduction to work. */
- complain &= ~tf_partial;
var = finish_template_variable (var, complain);
mark_used (var);
return var;
@@ -22008,6 +22002,14 @@ instantiate_template (tree tmpl, tree orig_args, tsubst_flags_t complain)
if (tmpl == error_mark_node)
return error_mark_node;
+ /* The other flags are not relevant anymore here, especially tf_partial
+ shouldn't be set. For instance, we may be called while doing a partial
+ substitution of a template variable, but the type of the variable
+ template may be auto, in which case we will call do_auto_deduction
+ in mark_used (which clears tf_partial) and the auto must be properly
+ reduced at that time for the deduction to work. */
+ complain &= tf_warning_or_error;
+
gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
if (modules_p ())
--
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