I've committed the following patch.

2016-07-30  Steven G. Kargl  <ka...@gcc.gnu.org>

        PR fortran/68566
        * check.c (gfc_check_reshape): Check for constant expression.

2016-07-30  Steven G. Kargl  <ka...@gcc.gnu.org>

        PR fortran/68566
        * gfortran.dg/pr68566.f90: new test.

Index: gcc/fortran/check.c
===================================================================
--- gcc/fortran/check.c (revision 238905)
+++ gcc/fortran/check.c (working copy)
@@ -3827,7 +3827,7 @@ gfc_check_reshape (gfc_expr *source, gfc
       if (!type_check (order, 3, BT_INTEGER))
        return false;
 
-      if (order->expr_type == EXPR_ARRAY)
+      if (order->expr_type == EXPR_ARRAY && gfc_is_constant_expr (order))
        {
          int i, order_size, dim, perm[GFC_MAX_DIMENSIONS];
          gfc_expr *e;
Index: gcc/testsuite/gfortran.dg/pr68566.f90
===================================================================
--- gcc/testsuite/gfortran.dg/pr68566.f90       (nonexistent)
+++ gcc/testsuite/gfortran.dg/pr68566.f90       (working copy)
@@ -0,0 +1,12 @@
+program p
+   character(len=20) s1, s2
+   integer, allocatable :: n(:)
+   n = [2,1]
+   s1 = '1 5 2 6 3 0 4 0'
+   write(s2,'(8(I0,1x))') reshape ([1,2,3,4,5,6], [2,4], [0,0], [2,1])
+   if (trim(s1) /= trim(s2)) call abort
+   write(s2,'(8(I0,1x))') reshape ([1,2,3,4,5,6], [2,4], [0,0], n)
+   if (trim(s1) /= trim(s2)) call abort
+   write(s2,'(8(I0,1x))') reshape ([1,2,3,4,5,6], [2,4], [0,0], [n])
+   if (trim(s1) /= trim(s2)) call abort
+end
-- 
Steve

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