re PR c++/49251 ([C++0x][parameter pack expanding] unused parameter warning with...

	PR c++/49251
	* semantics.c (finish_id_expression): Mark even dependent
	variables as used.

From-SVN: r175119

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 6523c94..a8baca2 100644 (file)
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,5 +1,9 @@
 2011-06-16  Jason Merrill  <jason@redhat.com>
 
+       PR c++/49251
+       * semantics.c (finish_id_expression): Mark even dependent
+       variables as used.
+
        PR c++/49420
        * error.c (dump_template_argument): Don't try to omit default
        template args from an argument pack.

diff --git a/gcc/cp/semantics.c b/gcc/cp/semantics.c
index 55f9519..bad7acb 100644 (file)
--- a/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@ -3196,7 +3196,10 @@ finish_id_expression (tree id_expression,
             (or an instantiation thereof).  */
          if (TREE_CODE (decl) == VAR_DECL
              || TREE_CODE (decl) == PARM_DECL)
-           return convert_from_reference (decl);
+           {
+             mark_used (decl);
+             return convert_from_reference (decl);
+           }
          /* The same is true for FIELD_DECL, but we also need to
             make sure that the syntax is correct.  */
          else if (TREE_CODE (decl) == FIELD_DECL)

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 6622a60..cc12e7b 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,8 @@
 2011-06-16  Jason Merrill  <jason@redhat.com>
 
+       PR c++/49251
+       * g++.dg/cpp0x/variadic113.C: New.
+
        PR c++/49420
        * g++.dg/cpp0x/variadic112.C: New.
 

diff --git a/gcc/testsuite/g++.dg/cpp0x/variadic113.C b/gcc/testsuite/g++.dg/cpp0x/variadic113.C
new file mode 100644 (file)
index 0000000..3f1bb2a
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/variadic113.C
@@ -0,0 +1,20 @@
+// PR c++/49251
+// { dg-options "-std=c++0x -Wunused-parameter" }
+
+struct A {};
+template <int> int f(A);
+
+template< int... Indices >
+struct indices {};
+
+template< class... Args >
+void sink( Args&&... ) {}
+
+template< class T, int... Indices >
+void unpack_test( T && t, indices<Indices...> ) {
+  sink( f<Indices>(t)... );
+}
+
+int main() {
+  unpack_test( A(), indices<>() );
+}