c++: array new with value-initialization [PR115645]

This extends the r11-5179 fix which doesn't work with multidimensional
arrays.  In particular,

  struct S {
    explicit S() { }
  };
  auto p = new S[1][1]();

should not say "converting to S from initializer list would use
explicit constructor" because there's no {}.  However, since we
went into the block where we create a {}, we got confused.  We
should not have gotten there but we did because array_p was true.

This patch refines the check once more.

	PR c++/115645

gcc/cp/ChangeLog:

	* init.cc (build_new): Don't do any deduction for arrays with
	bounds if it's value-initialized.

gcc/testsuite/ChangeLog:

	* g++.dg/expr/anew7.C: New test.

1 files changed, 13 insertions, 0 deletions

diff --git a/gcc/testsuite/g++.dg/expr/anew7.C b/gcc/testsuite/g++.dg/expr/anew7.C
new file mode 100644
index 0000000..ead5536
--- /dev/null
+++ b/gcc/testsuite/g++.dg/expr/anew7.C
@@ -0,0 +1,13 @@
+// PR c++/115645
+// { dg-do compile { target c++11 } }
+
+struct S {
+  explicit S() { }
+};
+
+auto p = new S[1][1]();
+auto q = new S[1][1]{}; // { dg-error "explicit" }
+auto r = new S[1]();
+auto s = new S[1]{}; // { dg-error "explicit" }
+auto t = new S[1][1][1]();
+auto u = new S[1][1][1]{}; // { dg-error "explicit" }