Hello world,

the attached patch fixes PR 48955, a wrong-code regression for 4.6 and 
4.7, including the test case from 
http://gcc.gnu.org/ml/fortran/2011-05/msg00093.html .  It follows the 
outline from http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48955#c7 .

Regression-tested. OK for trunk?

	Thomas

2011-05-22  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/48955
         * gfortran.h (gfc_reverse):  Change to struct with two boolean
         variables, forward_ok and backward_ok.
         * trans-expr.c (gfc_trans_assignment_1):  Initialize using
         new gfc_reverse struct.
         * trans-array.c (gfc_init_loopinfo):  Likewise.
         (gfc_trans_scalarized_loop):  Use new gfc_reverse.
         * dependency.c (gfc_dep_resovler):  Use new gfc_reverse.
         If a forward dependency is found, a backward dependency is
         no longer possible and vice versa.

2011-05-22  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/48955
         * gfortran.dg/dependency_40.f90:  New test.