backport: re PR fortran/86417 (FAIL: libgomp.fortran/alloc-comp-3.f90 -O0 (test...

backport: re PR fortran/86417 (FAIL: libgomp.fortran/alloc-comp-3.f90   -O0  (test for excess errors))

2018-07-16  Fritz Reese  <fritzoreese@gmail.com>

    Backport r262442 and r262743.

    gcc/fortran/ChangeLog:

	Backport from trunk:

	PR fortran/86417
	* module.c (mio_component): Set component->loc when loading from module.

	PR fortran/83183
	PR fortran/86325
	* expr.c (class_allocatable, class_pointer, comp_allocatable,
	comp_pointer): New helpers.
	(component_initializer): Generate EXPR_NULL for allocatable or pointer
	components. Do not generate initializers for components within BT_CLASS.
	Do not assign to comp->initializer.
	(gfc_generate_initializer): Use new helpers; move code to generate
	EXPR_NULL for class allocatable components into component_initializer().

    gcc/testsuite/ChangeLog:

	Backport from trunk:

	PR fortran/83183
	PR fortran/86325
	* gfortran.dg/init_flag_18.f90: New testcase.
	* gfortran.dg/init_flag_19.f03: New testcase.

From-SVN: r262746