[patch, fortran] PR 46659 - extend conversion warnings to assignments

[Thomas Koenig]

Hello world,

the attached patch extends conversion warnings to assignments.

OK for trunk?

	Thomas

011-08-14  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/46659
         * expr.c (gfc_check_assign): Check for type conversions when the
         right-hand side is a constant REAL cor COMPLEX contstant the
         left-hand side is also REAL or COMPLEX.  Don't warn when a
         narrowing conversion does not change the value of the constant.

2011-08-14  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/46659
         * gfortran.dg/warn_conversion_2.f90:  Also warn about conversion
         of a constant resulting from simplification.
         * gfortran.dg/warn_conversion_3.f90:  New test.
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