[gcc r12-9463] c++: attribute on dtor in template [PR108795]

[Jason Merrill <jason@gcc.gnu.org>]

https://gcc.gnu.org/g:1c1a9a0b60a9a182bcff79084e5ac367a6329bc2

commit r12-9463-g1c1a9a0b60a9a182bcff79084e5ac367a6329bc2
Author: Jason Merrill <jason@redhat.com>
Date:   Tue Mar 21 15:15:27 2023 -0400

    c++: attribute on dtor in template [PR108795]
    
    Since r7-2549 we were throwing away the explicit C:: when we found that ~C
    has an attribute that we treat as making its type dependent.
    
            PR c++/108795
    
    gcc/cp/ChangeLog:
    
            * semantics.cc (finish_id_expression_1): Check scope before
            returning id_expression.
    
    gcc/testsuite/ChangeLog:
    
            * g++.dg/ext/attr-tsafe1.C: New test.

Diff:
---
 gcc/cp/semantics.cc                    |  1 +
 gcc/testsuite/g++.dg/ext/attr-tsafe1.C | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc
index ae6cf71b4f5..ee0db331f34 100644
--- a/gcc/cp/semantics.cc
+++ b/gcc/cp/semantics.cc
@@ -4152,6 +4152,7 @@ finish_id_expression_1 (tree id_expression,
 		    : CP_ID_KIND_UNQUALIFIED)));
 
       if (dependent_p
+	  && !scope
 	  && DECL_P (decl)
 	  && any_dependent_type_attributes_p (DECL_ATTRIBUTES (decl)))
 	/* Dependent type attributes on the decl mean that the TREE_TYPE is
diff --git a/gcc/testsuite/g++.dg/ext/attr-tsafe1.C b/gcc/testsuite/g++.dg/ext/attr-tsafe1.C
new file mode 100644
index 00000000000..20c319f154d
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/attr-tsafe1.C
@@ -0,0 +1,14 @@
+// PR c++/108795
+
+template <typename T> void g (T x)
+{
+  struct C
+  {
+    __attribute__((transaction_safe)) ~C();
+  };
+  C::~C();			// { dg-error "" }
+}
+void f ()
+{
+  g (5);
+}