re PR fortran/56666 (Suppression flag for " DO loop at (1) will be executed zero...

re PR fortran/56666 (Suppression flag for " DO loop at (1) will be executed zero times")

2013-08-12  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/56666
	* gfortran.h (gfc_option_t):  Add warn_zerotrip.
	* invoke.texi (-Wzerotrip):  Document option.
	* lang.opt (Wzerotrip):  Add.
	* options.c (gfc_init_options):  Initialize warn_zerotrip.
	(set_Wall): Add handling of warn_zerotrip.
	(gfc_handle_option):  Handle OPT_Wzerotrip.
	* resolve.c (gfc_resolve_iterator): Honor
	gfc_option.warn_zerotrip; update error message to show
	how to suppress the warning.

2013-08-12  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/56666
	* gfortran.dg/do_check_10.f90:  New test.
	* gfortran.dg/array_constructor_11.f90:  Add -Wzerotrip to dg-options.
	* gfortran.dg/array_constructor_18.f90:  Likewise.
	* gfortran.dg/array_constructor_22.f90:  Likewise.
	* gfortran.dg/coarray_15.f90:  Likewise.
	* gfortran.dg/do_1.f90:  Add -Wall to dg-options.
	* gfortran.dg/do_3.F90:  Add -Wzerotrip to dg-options.
	* gfortran.dg/do_check_5.f90:  Add -Wall to gd-options.

From-SVN: r201658