PR c++/60063 - -Wunused-local-typedefs and templates.

	* decl2.c (is_late_template_attribute): Return false for "used".

From-SVN: r249347

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index d082574..465e7d9 100644 (file)
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,5 +1,8 @@
 2017-06-17  Jason Merrill  <jason@redhat.com>
 
+       PR c++/60063 - -Wunused-local-typedefs and templates.
+       * decl2.c (is_late_template_attribute): Return false for "used".
+
        PR c++/70844 - -Wuseless-cast and inheriting constructor.
        * method.c (forward_parm): Suppress warn_useless_cast.
 

diff --git a/gcc/cp/decl2.c b/gcc/cp/decl2.c
index 69cb40f..72239ec 100644 (file)
--- a/gcc/cp/decl2.c
+++ b/gcc/cp/decl2.c
@@ -1091,9 +1091,10 @@ is_late_template_attribute (tree attr, tree decl)
   if (is_attribute_p ("weak", name))
     return true;
 
-  /* Attribute unused is applied directly, as it appertains to
+  /* Attributes used and unused are applied directly, as they appertain to
      decls. */
-  if (is_attribute_p ("unused", name))
+  if (is_attribute_p ("unused", name)
+      || is_attribute_p ("used", name))
     return false;
 
   /* Attribute tls_model wants to modify the symtab.  */

diff --git a/gcc/testsuite/g++.dg/warn/Wunused-local-typedefs-4.C b/gcc/testsuite/g++.dg/warn/Wunused-local-typedefs-4.C
new file mode 100644 (file)
index 0000000..7efe112
--- /dev/null
+++ b/gcc/testsuite/g++.dg/warn/Wunused-local-typedefs-4.C
@@ -0,0 +1,13 @@
+// PR c++/60063
+// { dg-options -Wunused-local-typedefs }
+
+template <class> struct S;
+
+void foo (int i) {
+    typedef __attribute__ ((used)) S<int> X;
+}
+
+template <class T>
+void bar (T i) {
+    typedef __attribute__ ((used)) S<T> Y;
+}