re PR fortran/80118 (ICE with zero size parameter array)

2017-09-24  Thomas Koenig  <tkoenig@gcc.gnu.org>
	    Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/80118
	* expr.c (gfc_get_full_arrayspec_from_expr): If there is
	no symtree, set array spec to NULL.

2017-09-24  Thomas Koenig  <tkoenig@gcc.gnu.org>
	    Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/80118
	* gfortran.dg/zero_sized_7.f90: New test.


Co-Authored-By: Steven G. Kargl <kargl@gcc.gnu.org>

From-SVN: r253123

gcc/fortran/ChangeLog

+2017-09-24  Thomas Koenig  <tkoenig@gcc.gnu.org>
+	    Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/80118
+	* expr.c (gfc_get_full_arrayspec_from_expr): If there is
+	no symtree, set array spec to NULL.
+
 2017-09-23  Janus Weil  <janus@gcc.gnu.org>
 
 	PR fortran/82143

gcc/fortran/expr.c

@@ -4568,7 +4568,11 @@ gfc_get_full_arrayspec_from_expr (gfc_expr *expr)
   if (expr->expr_type == EXPR_VARIABLE
       || expr->expr_type == EXPR_CONSTANT)
     {
-      as = expr->symtree->n.sym->as;
+      if (expr->symtree)
+	as = expr->symtree->n.sym->as;
+      else
+	as = NULL;
+
       for (ref = expr->ref; ref; ref = ref->next)
 	{
 	  switch (ref->type)

gcc/testsuite/ChangeLog

+2017-09-24  Thomas Koenig  <tkoenig@gcc.gnu.org>
+	    Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/80118
+	* gfortran.dg/zero_sized_7.f90: New test.
+
 2017-09-23  Janus Weil  <janus@gcc.gnu.org>
 
 	PR fortran/82143

gcc/testsuite/gfortran.dg/zero_sized_7.f90

+! { dg-do compile }
+! PR 80118 - this used to ICE
+! Original test case by Marco Restelli
+module m
+implicit none
+
+  integer, parameter :: not_empty(1) = 0
+  integer, parameter :: empty1(0) = (/integer :: /)
+  integer, parameter :: empty2(0) = 0
+
+contains
+
+ subroutine sub(v)
+  integer, allocatable, intent(out) :: v(:)
+   v = 2*empty2 ! internal compiler error
+ end subroutine sub
+
+end module m