re PR fortran/30146 (Redefining do-variable in excecution cycle)

re PR fortran/30146 (Redefining do-variable in excecution cycle)

2012-11-25  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/30146
	* frontend-passes.c (doloop_warn):  New function.
	(doloop_list):  New static variable.
	(doloop_size):  New static variable.
	(doloop_level):  New static variable.
	(gfc_run_passes): Call doloop_warn.
	(doloop_code):  New function.
	(doloop_function):  New function.
	(gfc_code_walker):  Keep track of DO level.

2012-11-25  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/30146
	* gfortran.dg/do_check_6.f90:  New test.

From-SVN: r193793