Wunused-parameter warnings are given from cgraph::finalize_function,

Wunused-parameter warnings are given from cgraph::finalize_function,
which is the middle-end. This is an oddity compared to other
-Wunused-* warnings. Moreover, Fortran has its own definition of
-Wunused-parameter that conflicts with the middle-end definition.

This patch moves the middle-end part of Wunused-parameter to the C/C++
FEs. I'm not sure if other FEs expected this warning to work. If so,
they do not seem to test for it. Ada, for example, explicitly disables
it.

gcc/ChangeLog:

2015-06-29  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	PR fortran/66605
	* cgraphunit.c (cgraph_node::finalize_function): Do not call
	do_warn_unused_parameter.
	* function.c (do_warn_unused_parameter): Move from here.
	* function.h (do_warn_unused_parameter): Do not declare.

gcc/c-family/ChangeLog:

2015-06-29  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	PR fortran/66605
	* c-common.c (do_warn_unused_parameter): Move here.
	* c-common.h (do_warn_unused_parameter): Declare.

gcc/ada/ChangeLog:

2015-06-29  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	PR fortran/66605
	* gcc-interface/misc.c (gnat_post_options): No need to disable
	warn_unused_parameter anymore.

gcc/cp/ChangeLog:

2015-06-29  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	PR fortran/66605
	* decl.c (finish_function): Call do_warn_unused_parameter.

gcc/testsuite/ChangeLog:

2015-06-29  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	PR fortran/66605
	* gfortran.dg/wunused-parameter.f90: New test.

gcc/c/ChangeLog:

2015-06-29  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	PR fortran/66605
	* c-decl.c (finish_function): Call do_warn_unused_parameter.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@225135 138bc75d-0d04-0410-961f-82ee72b054a4