stor-layout.c (finish_bitfield_representative): Fallback to conservative maximum...

stor-layout.c (finish_bitfield_representative): Fallback to conservative maximum size if the padding up to the next field...

2012-03-20  Richard Guenther  <rguenther@suse.de>

	* stor-layout.c (finish_bitfield_representative): Fallback
	to conservative maximum size if the padding up to the next
	field cannot be computed as a constant.
	(finish_bitfield_layout): If we cannot compute the distance
	between the start of the bitfield representative and the
	bitfield member start a new representative.
	* expr.c (get_bit_range): The distance between the start of
	the bitfield representative and the bitfield member is zero
	if the field offsets are not constants.

	* gnat.dg/pack16.adb: New testcase.
	* gnat.dg/pack16_pkg.ads: Likewise.
	* gnat.dg/specs/pack8.ads: Likewise.
	* gnat.dg/specs/pack8_pkg.ads: Likewise.

From-SVN: r185563