re PR fortran/68053 (lower bound of implied shape array restricted too much)

2015-11-08  Steven g. Kargl  <kargl@gcc.gnu.org>

	PR fortran/68053
	* decl.c (add_init_expr_to_sym):  Try to reduce initialization expression
	before testing for a constant value.

2015-11-08  Steven g. Kargl  <kargl@gcc.gnu.org>

	PR fortran/68053
	* gfortran.dg/pr68053.f90: New test.

From-SVN: r229992

gcc/fortran/ChangeLog

+2015-11-08  Steven g. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/68053
+	* decl.c (add_init_expr_to_sym):  Try to reduce initialization expression
+	before testing for a constant value.
+
 2015-11-08  Andre Vehreschild  <vehre@gcc.gnu.org>
 
 	PR fortran/68218

gcc/fortran/decl.c

@@ -1529,26 +1529,34 @@ add_init_expr_to_sym (const char *name, gfc_expr **initp, locus *var_locus)
 	  for (dim = 0; dim < sym->as->rank; ++dim)
 	    {
 	      int k;
-	      gfc_expr* lower;
-	      gfc_expr* e;
+	      gfc_expr *e, *lower;
 
 	      lower = sym->as->lower[dim];
-	      if (lower->expr_type != EXPR_CONSTANT)
+
+	      /* If the lower bound is an array element from another 
+		 parameterized array, then it is marked with EXPR_VARIABLE and
+		 is an initialization expression.  Try to reduce it.  */
+	      if (lower->expr_type == EXPR_VARIABLE)
+		gfc_reduce_init_expr (lower);
+
+	      if (lower->expr_type == EXPR_CONSTANT)
+		{
+		  /* All dimensions must be without upper bound.  */
+		  gcc_assert (!sym->as->upper[dim]);
+
+		  k = lower->ts.kind;
+		  e = gfc_get_constant_expr (BT_INTEGER, k, &sym->declared_at);
+		  mpz_add (e->value.integer, lower->value.integer,
+			   init->shape[dim]);
+		  mpz_sub_ui (e->value.integer, e->value.integer, 1);
+		  sym->as->upper[dim] = e;
+		}
+	      else
 		{
 		  gfc_error ("Non-constant lower bound in implied-shape"
 			     " declaration at %L", &lower->where);
 		  return false;
 		}
-
-	      /* All dimensions must be without upper bound.  */
-	      gcc_assert (!sym->as->upper[dim]);
-
-	      k = lower->ts.kind;
-	      e = gfc_get_constant_expr (BT_INTEGER, k, &sym->declared_at);
-	      mpz_add (e->value.integer,
-		       lower->value.integer, init->shape[dim]);
-	      mpz_sub_ui (e->value.integer, e->value.integer, 1);
-	      sym->as->upper[dim] = e;
 	    }
 
 	  sym->as->type = AS_EXPLICIT;

gcc/testsuite/ChangeLog

+2015-11-08  Steven g. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/68053
+	* gfortran.dg/pr68053.f90: New test.
+
 2015-11-06  Jan Hubicka  <hubicka@ucw.cz>
 
 	* g++.dg/lto/pr68057_0.C: Fix testcase.

gcc/testsuite/gfortran.dg/pr68053.f90

+! { dg-do run }
+! PR fortran/68053
+! Original code contributed by Gerhard Steinmetz
+! <gerhard dot steinmetx dot fortran at t-online dot de>
+program p
+   integer, parameter :: n(3) = [1,2,3]
+   integer, parameter :: x(1) = 7
+   integer, parameter :: z(n(2):*) = x
+   if (lbound(z,1) /= 2) call abort
+end