2012-07-25  Sandra Loosemore  <sandra@codesourcery.com>
	    Paul Brook  <paul@codesourcery.com>

	PR target/53633

	gcc/
	* target.def (warn_func_return): New hook.
	* doc/tm.texi.in (TARGET_WARN_FUNC_RETURN): New hook.
	* doc/tm.texi: Regenerate.
	* doc/sourcebuild.texi (Effective-Target Keywords): Document
	naked_functions.
	* ipa-pure-const.c (warn_function_noreturn): Check
	targetm.warn_func_return.
	* tree-cfg.c (execute_warn_function_return): Likewise.
	* config/spu/spu.c (spu_warn_func_return): New.
	(TARGET_WARN_FUNC_RETURN): Define.
	* config/rx/rx.c (rx_warn_func_return): New.
	(TARGET_WARN_FUNC_RETURN): Define.
	* config/avr/avr.c (avr_warn_func_return): New.
	(TARGET_WARN_FUNC_RETURN): Define.
	* config/arm/arm.c (arm_warn_func_return): New.
	(TARGET_WARN_FUNC_RETURN): Define.
	* config/mcore/mcore.c (mcore_warn_func_return): New.
	(TARGET_WARN_FUNC_RETURN): Define.
	(saved_warn_return_type, saved_warn_return_type_count): Remove.
	(mcore_reorg, mcore_handle_naked_attribute): Remove warn_return hack.

	gcc/cp/
	* decl.c (finish_function): Check targetm.warn_func_return.

	gcc/testsuite/
	* lib/target-suports.exp (check_effective_target_naked_functions):
	New.
	* c-c++-common/pr53633.c: New test.

Co-Authored-By: Paul Brook <paul@codesourcery.com>

From-SVN: r189860