PR c++/80605 - __is_standard_layout and zero-length array

	* class.c (check_bases): Use DECL_FIELD_IS_BASE.

From-SVN: r248470

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 279bcdb4989eb620ba11b812c0a0a97f56d75cd9..9b7b58651f80844f8b0d998266fb0420bd5a1aad 100644 (file)
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,8 @@
+2017-05-25  Jason Merrill  <jason@redhat.com>
+
+       PR c++/80605 - __is_standard_layout and zero-length array
+       * class.c (check_bases): Use DECL_FIELD_IS_BASE.
+
 2017-05-25  Nathan Sidwell  <nathan@acm.org>
 
        Kill OVL_CURRENT, OVL_NEXT.
@@ -727,6 +732,7 @@
 
 2017-05-09  Jason Merrill  <jason@redhat.com>
 
+       PR c++/80605 - __is_standard_layout and empty base
        * class.c (check_bases): Ignore empty bases.
 
        PR c++/70979 - literal class and closure types

diff --git a/gcc/cp/class.c b/gcc/cp/class.c
index 984fb09ff4b4c4e8e75d0e145f03807eaec71137..eddc11886673ae48db3cadb4c8032c5aa0ac0204 100644 (file)
--- a/gcc/cp/class.c
+++ b/gcc/cp/class.c
@@ -1842,8 +1842,8 @@ check_bases (tree t,
            for (basefield = TYPE_FIELDS (basetype); basefield;
                 basefield = DECL_CHAIN (basefield))
              if (TREE_CODE (basefield) == FIELD_DECL
-                 && DECL_SIZE (basefield)
-                 && !integer_zerop (DECL_SIZE (basefield)))
+                 && !(DECL_FIELD_IS_BASE (basefield)
+                      && integer_zerop (DECL_SIZE (basefield))))
                {
                  if (field)
                    CLASSTYPE_NON_STD_LAYOUT (t) = 1;

diff --git a/gcc/testsuite/g++.dg/ext/is_std_layout2.C b/gcc/testsuite/g++.dg/ext/is_std_layout2.C
new file mode 100644 (file)
index 0000000..02dc4f7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/is_std_layout2.C
@@ -0,0 +1,6 @@
+// { dg-do compile { target c++11 } }
+// { dg-options "" }
+
+struct S { int a[0]; };
+struct T : public S { int b[0]; int c; };
+static_assert(!__is_standard_layout (T), "");