PR c++/57402

	* init.c (build_vec_init): Don't take shortcuts when initializing
	a VLA.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@200860 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 1bc0b6f..7da759a 100644 (file)
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,5 +1,9 @@
 2013-07-09  Jason Merrill  <jason@redhat.com>
 
+       PR c++/57402
+       * init.c (build_vec_init): Don't take shortcuts when initializing
+       a VLA.
+
        PR c++/57471
        * parser.c (cp_parser_sizeof_pack): Clear parser scopes.
 

diff --git a/gcc/cp/init.c b/gcc/cp/init.c
index 4edd150..7acc7b5 100644 (file)
--- a/gcc/cp/init.c
+++ b/gcc/cp/init.c
@@ -3332,6 +3332,7 @@ build_vec_init (tree base, tree maxindex, tree init,
 
   if (init
       && TREE_CODE (atype) == ARRAY_TYPE
+      && TREE_CONSTANT (maxindex)
       && (from_array == 2
          ? (!CLASS_TYPE_P (inner_elt_type)
             || !TYPE_HAS_COMPLEX_COPY_ASSIGN (inner_elt_type))
@@ -3452,6 +3453,7 @@ build_vec_init (tree base, tree maxindex, tree init,
       tree field, elt;
       /* Should we try to create a constant initializer?  */
       bool try_const = (TREE_CODE (atype) == ARRAY_TYPE
+                       && TREE_CONSTANT (maxindex)
                        && (literal_type_p (inner_elt_type)
                            || TYPE_HAS_CONSTEXPR_CTOR (inner_elt_type)));
       /* If the constructor already has the array type, it's been through
@@ -3561,6 +3563,8 @@ build_vec_init (tree base, tree maxindex, tree init,
 
       /* Clear out INIT so that we don't get confused below.  */
       init = NULL_TREE;
+      /* Any elements without explicit initializers get {}.  */
+      explicit_value_init_p = true;
     }
   else if (from_array)
     {

diff --git a/gcc/testsuite/g++.dg/cpp1y/vla10.C b/gcc/testsuite/g++.dg/cpp1y/vla10.C
new file mode 100644 (file)
index 0000000..1c67290
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1y/vla10.C
@@ -0,0 +1,24 @@
+// PR c++/57402
+// { dg-options "-std=c++1y -pedantic-errors" }
+
+int i = 2;
+
+int main()
+{
+  {
+    int a[i];
+    a[1] = 0xbeef;
+  }
+  {
+    int a[i] = { 1 };
+    if (a[1] != 0)
+      __builtin_abort ();
+    a[1] = 0xbeef;
+  }
+  {
+    int a[i] = { };
+    if (a[1] != 0)
+      __builtin_abort ();
+    a[1] = 0xbeef;
+  }
+}