* c-typeck.c (store_init_value): Don't require constant initializer
	elements with -pedantic -std=c99.
	(digest_init): Change error about non-constant initializer elements
	into pedwarn.
	(constructor_range_end): Remove.
	(constructor_incremental, designator_depth,
	designator_errorneous): New variables.
	(struct constructor_stack): Remove range_end, add incremental.
	(struct constructor_range_stack, constructor_range_stack): New.
	(struct initializer_stack): Add constructor_range_stack.
	(finish_init): Set it.
	(start_init): Likewise.  require_constant_elements for non-static
	trees only if not flag_isoc99.
	(really_start_incremental_init): Remove constructor_range_end, add
	constructor_incremental.
	(pop_init_level): Likewise.
	(push_init_level): Likewise.  If implicit and the subobject had some
	value set already, preinitialize the level with it.
	Warn about missing braces only if not pushing due to designators.
	(set_designator, push_range_stack): New functions.
	(set_init_label): Use them.
	(set_init_index): Likewise.  Remove constructor_range_end.
	Error if designator index is outside of array bounds.
	(add_pending_init): Compare values of purpose index trees, not the
	trees themselves.  Allow overwriting of already initialized element.
	Issue a warning if it had side-effects.
	(set_nonincremental_init, set_nonincremental_init_from_string): New
	functions.
	(pending_init_member): Rename to...
	(find_init_member): ...this function.  Call set_nonincremental_init
	if necessary.  Compare values of purpose index trees, not the trees
	themselves.  Return the actual value, not just non-zero if something
	is found.
	(output_init_element): Remove checks for duplicates.
	If field has zero size, only check the initializer for correctness.
	Call set_nonincremental_init if necessary.  Push RECORD/ARRAY into AVL
	if constructor_incremental is zero.  Change error about initializers
	not computable at load time into pedwarn.
	(output_pending_init_elements): Compare bit positions, not
	FIELD_DECLs to take into account zero-sized fields.
	(process_init_element): Use constructor_range_stack to fill all
	ranges in the designator lists from current level up.
	* extend.texi: Update documentation for labeled elements.

	* gcc.c-torture/execute/20000801-3.x: Remove.
	* gcc.dg/c90-init-1.c: New test.
	* gcc.dg/c99-init-1.c: New test.
	* gcc.dg/c99-init-2.c: New test.
	* gcc.dg/gnu99-init-1.c: New test.

From-SVN: r38968