re PR fortran/87919 (Incorrect fortran handling of -fno-* options)

re PR fortran/87919 (Incorrect fortran handling of -fno-* options)

2018-12-03  Fritz Reese  <fritzoreese@gmail.com>
            Mark Eggleston <mark.eggleston@codethink.co.uk>

    PR fortran/87919

    gcc/fortran/ChangeLog:

	PR fortran/87919
	* options.c (SET_FLAG, SET_BITFLAG, SET_BITFLAG2): New macros.
	(set_dec_flags): Set/unset DEC and std flags according to value.
	(set_init_local_zero): New helper for -finit-local-zero flag group.
	(gfc_init_options): Fix disabling of init flags, array temporaries
	check, and dec flags when value is zero (from -fno-*).

    gcc/testsuite/ChangeLog:

	PR fortran/87919
	* gfortran.dg/array_temporaries_5.f90: New test.
	* gfortran.dg/dec_bitwise_ops_3.f90: Ditto.
	* gfortran.dg/dec_d_lines_3.f: Ditto.
	* gfortran.dg/dec_exp_4.f90: Ditto.
	* gfortran.dg/dec_exp_5.f90: Ditto.
	* gfortran.dg/dec_io_7.f90: Ditto.
	* gfortran.dg/dec_structure_24.f90: Ditto.
	* gfortran.dg/dec_structure_25.f90: Ditto.
	* gfortran.dg/dec_structure_26.f90: Ditto.
	* gfortran.dg/dec_structure_27.f90: Ditto.
	* gfortran.dg/dec_type_print_3.f90: Ditto.
	* gfortran.dg/init_flag_20.f90: Ditto.

Co-Authored-By: Mark Eggleston <mark.eggleston@codethink.co.uk>
From-SVN: r266745