PR c++/68890

	* constexpr.c (verify_ctor_sanity): Remove CONSTRUCTOR_NELTS check.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@233430 138bc75d-0d04-0410-961f-82ee72b054a4

3 files changed, 25 insertions, 1 deletions

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 3f2177f87ec..85473df23d5 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,8 @@
+2016-02-15  Jason Merrill  <jason@redhat.com>
+
+	PR c++/68890
+	* constexpr.c (verify_ctor_sanity): Remove CONSTRUCTOR_NELTS check.
+
 2016-02-12  Patrick Palka  <ppalka@gcc.gnu.org>
 
 	PR c++/69098
diff --git a/gcc/cp/constexpr.c b/gcc/cp/constexpr.c
index 85fc64ed8cc..11037fb62ca 100644
--- a/gcc/cp/constexpr.c
+++ b/gcc/cp/constexpr.c
@@ -2202,7 +2202,8 @@ verify_ctor_sanity (const constexpr_ctx *ctx, tree type)
   gcc_assert (ctx->ctor);
   gcc_assert (same_type_ignoring_top_level_qualifiers_p
 	      (type, TREE_TYPE (ctx->ctor)));
-  gcc_assert (CONSTRUCTOR_NELTS (ctx->ctor) == 0);
+  /* We used to check that ctx->ctor was empty, but that isn't the case when
+     the object is zero-initialized before calling the constructor.  */
   if (ctx->object)
     gcc_assert (same_type_ignoring_top_level_qualifiers_p
 		(type, TREE_TYPE (ctx->object)));
diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-value5.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-value5.C
new file mode 100644
index 00000000000..8928b671de7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-value5.C
@@ -0,0 +1,18 @@
+// PR c++/68890
+// { dg-do compile { target c++11 } }
+
+class ptr;
+template <long _Nm> struct A { typedef ptr _Type[_Nm]; };
+template <long _Nm> struct B { typename A<_Nm>::_Type _M_elems; };
+template <long N> class FixedVector : B<N> {
+public:
+  typedef B<1> base;
+  constexpr FixedVector() : base(), size_() {}
+  char size_;
+};
+class ptr {
+public:
+  constexpr ptr() : px_(){};
+  int px_;
+};
+FixedVector<1> a;