[patch, fortran] PR38407 - add -W[no-]unused-dummy-argument

[Daniel Franke]

Hi all.

Attached patch seperates warnings for unused variables and unused dummy 
arguments. 


gcc/fortran/:
2010-05-20  Daniel Franke  <franke.daniel@gmail.com>

	PR fortran/38407
	* lang.opt (Wunused-dummy-argument): New option.
	* gfortran.h (gfc_option_t): Add warn_unused_dummy_argument.
	* options.c (gfc_init_options): Disable warn_unused_dummy_argument.
	(set_Wall): Enable warn_unused_dummy_argument.
	(gfc_handle_option): Set warn_unused_dummy_argument according to
	command line.
	* trans-decl.c (generate_local_decl): Separate warnings about
	unused variables and unused dummy arguments.
	* invoke.texi: Documented new option.

gcc/testsuite/:
2010-05-20  Daniel Franke  <franke.daniel@gmail.com>

	PR fortran/38407
	* warn_unused_dummy_argument_1.f90: New.
	* warn_unused_dummy_argument_2.f90: New.


Regression tested on i686-pc-linux.gnu.
Ok for trunk?

	Daniel
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