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When evaluating functions of the MIN/MAX variety inline, use a temporary of appropriate type and kind, and convert to the result type at the end. In the case of allowing for the GNU extensions to MIN/MAX, derive the result kind consistently during simplificaton. Furthermore, the Fortran standard requires type and kind of arguments to the MIN/MAX intrinsics to all have the same type and kind. While a GNU extension accepts kind differences for integer and real arguments which seems to have been used in legacy code, there is no reason to allow different character kinds. We now reject the latter unconditionally. gcc/fortran/ChangeLog: * check.c (check_rest): Reject MIN/MAX character arguments of different kind. * simplify.c (min_max_choose): The simplification result shall have the highest kind value of the arguments. * trans-intrinsic.c (gfc_conv_intrinsic_minmax): Choose type and kind of intermediate by looking at all arguments, not the result. gcc/testsuite/ChangeLog: * gfortran.dg/minmax_char_3.f90: New test. * gfortran.dg/min_max_kind.f90: New test. * gfortran.dg/pr96613.f90: New test.
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