PR c++/71712 - ABI tags on conversion ops.

	* class.c (check_abi_tags): Don't duplicate tags for conversion ops.

From-SVN: r239299

gcc/cp/ChangeLog

 2016-08-09  Jason Merrill  <jason@redhat.com>
 
+	PR c++/71712
+	* class.c (check_abi_tags): Don't duplicate tags for conversion ops.
+
 	Adjust mangling of ABI tags on class template member functions.
 	* class.c (missing_abi_tags): New.
 	(check_abi_tags): Don't check template. Add just_checking mode.

gcc/cp/class.c

@@ -1618,6 +1618,7 @@ check_abi_tags (tree decl)
   if (VAR_P (decl))
     check_abi_tags (decl, TREE_TYPE (decl));
   else if (TREE_CODE (decl) == FUNCTION_DECL
+	   && !DECL_CONV_FN_P (decl)
 	   && !mangle_return_type_p (decl))
     check_abi_tags (decl, TREE_TYPE (TREE_TYPE (decl)));
 }
@@ -1632,6 +1633,9 @@ missing_abi_tags (tree decl)
   if (VAR_P (decl))
     return check_abi_tags (decl, TREE_TYPE (decl), true);
   else if (TREE_CODE (decl) == FUNCTION_DECL
+	   /* Don't check DECL_CONV_FN_P here like we do in check_abi_tags, so
+	      that we can use this function for setting need_abi_warning
+	      regardless of the current flag_abi_version.  */
 	   && !mangle_return_type_p (decl))
     return check_abi_tags (decl, TREE_TYPE (TREE_TYPE (decl)), true);
   else

gcc/cp/mangle.c

@@ -1383,6 +1383,15 @@ write_unqualified_name (tree decl)
     }
 
   tree tags = get_abi_tags (decl);
+  if (TREE_CODE (decl) == FUNCTION_DECL && DECL_CONV_FN_P (decl)
+      && any_abi_below (11))
+    if (tree mtags = missing_abi_tags (decl))
+      {
+	if (abi_warn_or_compat_version_crosses (11))
+	  G.need_abi_warning = true;
+	if (!abi_version_at_least (11))
+	  tags = chainon (mtags, tags);
+      }
   write_abi_tags (tags);
 }
 

gcc/testsuite/g++.dg/abi/abi-tag22.C

+// PR c++/71712
+// { dg-options -Wabi=10 }
+
+struct __attribute__((abi_tag("A", "B"))) A { };
+struct A18 {
+  operator A();			// { dg-warning "mangled name" }
+};
+void f18_test() {
+  // { dg-final { scan-assembler "_ZN3A18cv1AB1AB1BEv" } }
+  A a = A18();
+}

gcc/testsuite/g++.dg/abi/abi-tag22a.C

+// PR c++/71712
+// { dg-options "-fabi-version=10 -Wabi" }
+
+struct __attribute__((abi_tag("A", "B"))) A { };
+struct A18 {
+  operator A();			// { dg-warning "mangled name" }
+};
+void f18_test() {
+  // { dg-final { scan-assembler "_ZN3A18cv1AB1AB1BB1AB1BEv" } }
+  A a = A18();
+}