[patch, fortran] PR 47659 - extend conversion warnings to assignments

[Thomas Koenig]

Hello everybody,

now that I have found a little time, here is an updated version of
the patch, which incorporates Tobias' suggestions.  Regression-tested.

OK for trunk?

	Thomas

2011-08-21  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/47659
         * expr.c (gfc_check_assign): Check for type conversions when the
         right-hand side is a constant REAL/COMPLEX contstant the left-hand
         side is also REAL/COMPLEX.  Don't warn when a narrowing conversion
         for REAL does not change the value of the constant.

2011-08-21  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/47659
         * 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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