re PR fortran/52196 (Add -Wrealloc-lhs)

re PR fortran/52196 (Add -Wrealloc-lhs)

2012-04-25  Tobias Burnus  <burnus@net-b.de>

        PR fortran/52196
        * lang.opt (Wrealloc-lhs, Wrealloc-lhs-all): New flags.
        * gfortran.h (gfc_option_t): Add them.
        * options.c (gfc_init_options, gfc_post_options,
        gfc_handle_option): Handle them.
        * invoke.texi: Document them.
        * trans-expr.c (realloc_lhs_warning): New function.
        (gfc_trans_arrayfunc_assign,
        alloc_scalar_allocatable_for_assignment,
        gfc_trans_assignment_1): Use it.

2012-04-25  Tobias Burnus  <burnus@net-b.de>

        PR fortran/52196
        * gfortran.dg/realloc_on_assign_14.f90: New.

From-SVN: r186806