PR c++/93143 - incorrect tree sharing with constexpr.

We don't unshare CONSTRUCTORs as often during constexpr evaluation, so we
need to unshare them here.

	* constexpr.c (cxx_eval_outermost_constant_expr): Don't assume
	CONSTRUCTORs are already unshared.

From-SVN: r280127

1 files changed, 27 insertions, 0 deletions

diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-array22.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-array22.C
new file mode 100644
index 0000000..80e24e2
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-array22.C
@@ -0,0 +1,27 @@
+// PR c++/93143
+// { dg-do run { target c++11 } }
+
+struct A { char a[2]; };
+
+static constexpr A foo () { return A{1}; }
+
+void bar ()
+{
+  A a = foo ();
+  if (a.a[0] != 1)
+    __builtin_abort(); 
+}
+
+void foobar ()
+{
+  A x[] = { foo (), foo () };
+  A a = foo ();
+  if (a.a[0] != 1)
+    __builtin_abort(); 
+}
+
+int main()
+{
+  bar();
+  foobar();
+}