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Date: Thu, 21 Mar 2002 18:36:33 +1100 (EST)
From: =?iso-8859-1?q?Danny=20Smith?= <danny_r_smith_2001 AT yahoo DOT co DOT nz>
Subject: -fnative-structure revisited.
To: cygwin-apps <cygwin-apps AT cygwin DOT com>,
   mingw-dvlpr <mingw-dvlpr AT lists DOT sourceforge DOT net>
Cc: donn AT interix DOT com
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I just stumbled across this is gcc 3.1 changelog:

2002-02-05  Alexandre Oliva  <aoliva AT redhat DOT com>

	* target.h (struct gcc_target): Added ms_bitfield_layout_p.
	* target-def.h (TARGET_MS_BITFIELD_LAYOUT_P): New.  Added to...
	(TARGET_INITIALIZER): this.
	* doc/tm.texi (TARGET_MS_BITFIELD_LAYOUT_P): Document.
	(BITFIELD_NBYTES_LIMITED): Markup fix.
	* tree.h (default_ms_bitfield_layout_p): Declare.
	(record_layout_info): Added prev_field.
	* tree.c (default_ms_bitfield_layout_p): New fn.
	* c-decl.c (finish_struct): Disregard EMPTY_FIELD_BOUNDARY and
	PCC_BITFIELD_TYPE_MATTERS for MS bit-field layout.
	* stor-layout.c: Include target.h.
	(start_record_layout): Initialize prev_field.
	(place_field): Handle MS bit-field layout, and disregard
	EMPTY_FIELD_BOUNDARY, BITFIELD_NBYTES_LIMITED and
	PCC_BITFIELD_TYPE_MATTERS in this case.  Update prev_field.
	* Makefile.in (stor-layout.o): Adjust dependencies.


Essentially, it provides a hook to do what Donn Terry's -fnative-struct 
patch did.  Has anyone tested this yet on cygwin or mingw?  AFAICT, the
only target to use a non-default version of this hook is sh (see
config/sh/sh.c) 

I haven't worked through how to implement.  I won't worry yet about
applying MS-bit-field layout on structure-by-structure basis (as in Donn's
patch), but that option needs to be kept open.

Danny 

Danny

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