re PR fortran/90563 (Out of bounds error when compiling with -Wextra)

2013-08-13  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/90563
	* frontend-passes.c (insert_index): Suppress errors while
	simplifying the resulting expression.

2013-08-13  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/90563
	* gfortran.dg/do_subsript_5.f90: New test.

From-SVN: r274394

gcc/fortran/ChangeLog

+2013-08-13  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/90563
+	* frontend-passes.c (insert_index): Suppress errors while
+	simplifying the resulting expression.
+
 2019-08-13  Steven G. Kargl  <kargl@gcc.gnu.org>
 
 	PR fortran/89647

gcc/fortran/frontend-passes.c

@@ -2518,7 +2518,12 @@ insert_index (gfc_expr *e, gfc_symbol *sym, mpz_t val, mpz_t ret)
   data.sym = sym;
   mpz_init_set (data.val, val);
   gfc_expr_walker (&n, callback_insert_index, (void *) &data);
+
+  /* Suppress errors here - we could get errors here such as an
+     out of bounds access for arrays, see PR 90563.  */
+  gfc_push_suppress_errors ();
   gfc_simplify_expr (n, 0);
+  gfc_pop_suppress_errors ();
 
   if (n->expr_type == EXPR_CONSTANT)
     {

gcc/testsuite/ChangeLog

+2013-08-13  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/90563
+	* gfortran.dg/do_subsript_5.f90: New test.
+
 2019-08-13  Steven G. Kargl  <kargl@gcc.gnu.org>
 
 	PR fortran/89647

gcc/testsuite/gfortran.dg/do_subscript_5.f90

+! { dg-do compile }
+! PR 90563 - this used to be rejected, wrongly
+! Original test case by Tobias Neumann
+program test
+      implicit none
+      integer, parameter :: swap(4) = [2,1,3,4]
+      real :: p(20)
+      integer :: j
+
+      p = 0.0
+
+      do j=1,6
+          if (j<5) then
+              p(j) = p(swap(j))
+          endif
+      enddo
+end program