[PATCH] PR fortran/77372

[Steve Kargl]

I plan to commit the following patch on Saturday if
no one objects in the next 40 or so hours.

2016-08-25  Steven G. Kargl <kargl@gcc.gnu.org>

	PR fortran/77372
	simplify.c (simplify_ieee_selected_real_kind): Check for NULL pointers.

2016-08-25  Steven G. Kargl <kargl@gcc.gnu.org>

	PR fortran/77372
	gfortran.dg/pr77372.f90: New test.

Index: gcc/fortran/simplify.c
===================================================================
--- gcc/fortran/simplify.c	(revision 239762)
+++ gcc/fortran/simplify.c	(working copy)
@@ -7044,9 +7044,19 @@ gfc_simplify_compiler_version (void)
 gfc_expr *
 simplify_ieee_selected_real_kind (gfc_expr *expr)
 {
-  gfc_actual_arglist *arg = expr->value.function.actual;
-  gfc_expr *p = arg->expr, *q = arg->next->expr,
-	   *rdx = arg->next->next->expr;
+  gfc_actual_arglist *arg;
+  gfc_expr *p = NULL, *q = NULL, *rdx = NULL;
+
+  arg = expr->value.function.actual;
+  if (arg->expr)
+    p = arg->expr;
+  if (arg->next)
+    {
+      if (arg->next->expr)
+	q = arg->next->expr;
+      if (arg->next->next && arg->next->next->expr)
+	rdx = arg->next->next->expr;
+    }
 
   /* Currently, if IEEE is supported and this module is built, it means
      all our floating-point types conform to IEEE. Hence, we simply handle
Index: gcc/testsuite/gfortran.dg/pr77372.f90
===================================================================
--- gcc/testsuite/gfortran.dg/pr77372.f90	(nonexistent)
+++ gcc/testsuite/gfortran.dg/pr77372.f90	(working copy)
@@ -0,0 +1,7 @@
+! { dg-do compile }
+program p
+   use ieee_arithmetic
+   real(kind=ieee_selected_real_kind(10_1)) :: z1
+   real(kind=ieee_selected_real_kind(10_2)) :: z2
+   real(kind=ieee_selected_real_kind(10_4)) :: z4
+end

-- 
Steve