fortran/
* gfortran.h (gfc_actual_arglist): New field missing_arg_type.
* interface.c (compare_actual_formal): Keep type of omitted
optional arguments.
* trans-expr.c (gfc_conv_function_call): Add string length
argument for omitted string argument.

testsuite/
* gfortran.fortran-torture/execute/optstring_1.f90: New testcase.

From-SVN: r82608