PR C++/88114 Gen destructor of an abstract class

PR C++/8811
        * decl2.c (maybe_emit_vtables): If needed, generate code for
        the destructor of an abstract class.
        (mark_used): Update comment for older function-name change.

        PR C++/88114
        * g++.dg/cpp0x/defaulted61.C: New.
        * g++.dg/cpp0x/defaulted62.C: New.

From-SVN: r267855

gcc/cp/ChangeLog

@@ -1,3 +1,10 @@
+2019-01-11  Tobias Burnus  <burnus@net-b.de>
+
+	PR C++/88114
+	* decl2.c (maybe_emit_vtables): If needed, generate code for
+	the destructor of an abstract class.
+	(mark_used): Update comment for older function-name change.
+
 2019-01-11  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* decl.c (start_decl): Improve error location.

gcc/cp/decl2.c

@@ -2220,6 +2220,16 @@ maybe_emit_vtables (tree ctype)
 	}
     }
 
+  /* For abstract classes, the destructor has been removed from the
+     vtable (in class.c's build_vtbl_initializer).  For a compiler-
+     generated destructor, it hence might not have been generated in
+     this translation unit - and with '#pragma interface' it might
+     never get generated.  */
+  if (CLASSTYPE_PURE_VIRTUALS (ctype)
+      && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (ctype)
+      && DECL_DEFAULTED_IN_CLASS_P(CLASSTYPE_DESTRUCTOR(ctype)))
+    note_vague_linkage_fn (CLASSTYPE_DESTRUCTOR(ctype));
+
   /* Since we're writing out the vtable here, also write the debug
      info.  */
   note_debug_info_needed (ctype);
@@ -5497,7 +5507,7 @@ mark_used (tree decl, tsubst_flags_t complain)
 	 within the body of a function so as to avoid collecting live data
 	 on the stack (such as overload resolution candidates).
 
-         We could just let cp_write_global_declarations handle synthesizing
+         We could just let c_parse_final_cleanups handle synthesizing
          this function by adding it to deferred_fns, but doing
          it at the use site produces better error messages.  */
       ++function_depth;

gcc/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2019-01-11  Tobias Burnus  <burnus@net-b.de>
+
+	PR C++/88114
+	* g++.dg/cpp0x/defaulted61.C: New	
+	* g++.dg/cpp0x/defaulted62.C: New.
+
 2019-01-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/88693

gcc/testsuite/g++.dg/cpp0x/defaulted61.C

@@ -0,0 +1,22 @@
+// { dg-do compile { target c++11 } }
+// { dg-final { scan-assembler "_ZN3OneD0Ev" } }
+
+// PR C++/88114
+// Destructor of an abstract class was never generated
+// when compiling the class - nor later due to the
+// '#pragma interface'
+
+#pragma implementation
+#pragma interface
+
+class One
+{
+ public:
+  virtual ~One() = default;
+  void some_fn();
+  virtual void later() = 0;
+ private:
+  int m_int;
+};
+
+void One::some_fn() { }

gcc/testsuite/g++.dg/cpp0x/defaulted62.C

@@ -0,0 +1,25 @@
+// { dg-do compile { target c++11 } }
+// { dg-final { scan-assembler-not "_ZN3OneD0Ev" } }
+
+// PR C++/88114
+// Destructor of an abstract class was never generated
+// when compiling the class - nor later due to the
+// '#pragma interface'
+// -> g++.dg/cpp0x/defaulted61.C
+
+// HERE, in g++.dg/cpp0x/defaulted62.C:
+// As we have commented the pragmas, it should NOT be created
+// #pragma implementation
+// #pragma interface
+
+class One
+{
+ public:
+  virtual ~One() = default;
+  void some_fn();
+  virtual void later() = 0;
+ private:
+  int m_int;
+};
+
+void One::some_fn() { }