c++: fix ICE with [[deprecated]] [PR120756]

Here we end up with "error reporting routines re-entered" because
resolve_nondeduced_context isn't passing complain to mark_used.

	PR c++/120756

gcc/cp/ChangeLog:

	* pt.cc (resolve_nondeduced_context): Pass complain to mark_used.

gcc/testsuite/ChangeLog:

	* g++.dg/warn/deprecated-22.C: New test.

Reviewed-by: Jason Merrill <jason@redhat.com>

diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
index deb0106b1589d620ff3be3790a62011ccec49c70..c7a0066a11ac01467ad123d14264652750fd01c9 100644 (file)
--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -24604,7 +24604,8 @@ resolve_nondeduced_context (tree orig_expr, tsubst_flags_t complain)
        }
       if (good == 1)
        {
-         mark_used (goodfn);
+         if (!mark_used (goodfn, complain) && !(complain & tf_error))
+           return error_mark_node;
          expr = goodfn;
          if (baselink)
            expr = build_baselink (BASELINK_BINFO (baselink),

diff --git a/gcc/testsuite/g++.dg/warn/deprecated-22.C b/gcc/testsuite/g++.dg/warn/deprecated-22.C
new file mode 100644 (file)
index 0000000..60ee607
--- /dev/null
+++ b/gcc/testsuite/g++.dg/warn/deprecated-22.C
@@ -0,0 +1,13 @@
+// PR c++/120756
+// { dg-do compile { target c++11 } }
+
+struct A {
+    template <long> [[deprecated]] void foo ();
+};
+
+template <long t> [[deprecated]] auto bar () -> decltype (&A::foo<t>);
+
+void foo ()
+{
+  bar<0> ();  // { dg-warning "deprecated" }
+}