PR c++/69023 - bitset whose name is used in constant-expression rejected

PR c++/69023 - bitset whose name is used in constant-expression rejected
* g++.dg/lookup/name-clash11.C: New test.

From-SVN: r231938

gcc/testsuite/ChangeLog

+2015-12-23  Martin Sebor  <msebor@redhat.com>
+
+	PR c++/69023
+	* g++.dg/lookup/name-clash11.C: New test.
+
 2015-12-23  Nathan Sidwell  <nathan@acm.org>
 
 	* gcc.dg/alias-15.c: Revert.

gcc/testsuite/g++.dg/lookup/name-clash11.C

+// PR c++/69023 - bitset whose name is used in constant-expression rejected
+// Test also verifies the correct evaluation of the expressions with
+// -fpermissive.
+// { dg-options "-fpermissive" }
+
+#if __cplusplus >= 201103L
+#  define ASSERT(e) static_assert (e, #e)
+#else
+#  define ASSERT(e)                                             \
+  do { struct S { bool: !!(e); } asrt; (void)&asrt; } while (0)
+#endif
+
+
+void test_bitset ()
+{
+  int x;                        // { dg-warning "changes meaning" }
+
+  {
+    struct S {
+      int x: sizeof x;          // { dg-warning "declaration" }
+    };
+  }
+}
+
+void test_enum ()
+{
+  // Also exercise (not covered by c++/69023):
+  int y;                        // { dg-warning "changes meaning" }
+  {
+    struct S {
+      enum E {
+        y = sizeof y            // { dg-warning "declaration" }
+      };
+
+      // Verify the enumerator has the correct value.
+      void test () { ASSERT (y == sizeof (int)); }
+    };
+  }
+}
+
+void test_alignas ()
+{
+  enum { A = 16 };              // { dg-warning "changes meaning" }
+  {
+    struct S {
+#if __cplusplus >= 201103L
+      alignas (A)
+#else
+      __attribute__ ((aligned (A)))
+#endif
+      int A;                    // { dg-warning "declaration" }
+
+      // Verify the member has the correct alignment.
+      void test () { ASSERT (__alignof__ (this->A) == 16); }
+    };
+  }
+}
+
+void test_array ()
+{
+  enum { A = 16 };              // { dg-warning "changes meaning" }
+  {
+    struct S {
+      int A [A];                // { dg-warning "declaration" }
+
+      // Verify the member has the correct alignment.
+      void test () { ASSERT (sizeof (this->A) == 16 * sizeof (int)); }
+    };
+  } 
+}
+
+void test_vector ()
+{
+  enum { A = 16 };              // { dg-warning "changes meaning" }
+  {
+    struct S {
+      int A __attribute__ ((vector_size (A))); // { dg-warning "declaration" }
+
+      // Verify the member has the correct size.
+      void test () { ASSERT (sizeof (this->A) == 16); }
+    };
+  } 
+}
+