The following backport from mainline fixes PCH on i686-mingw32. It csl/sourcerygxx/3.4.4-32csl-gxxpro-3_4-branch

implements PCH on i686-mingw32 using CreateFileMapping and 
MapViewOfFileEX.

There were 3 patches in this timeframe, one from Ian Taylor, one from
Richard Henderson, and one from Danny Smith. I am backporting the two
simpler changes. Richard's patch rewrites much of the PCH handling and
it is too risky. Instead I have cherry-picked the important pieces of
Richards patch which allow Danny's patch to work correctly.

The hook HOST_HOOKS_GT_PCH_USE_ADDRESS now returns 1, 0, or -1 on
successfully mapped file, did nothing, and failed.

On mailine a return of 0 means "I mapped memory but didn't load the
file". No target uses this return to mean that. So I used 0 to
mean "use the default behaviour." The documentation is changed to
indicate this.

The default host hook for gt_pch_get_address returns zero, and maintains
the same semantics as before e.g. it attempts an MMAP at a fixed address.

Relocation of a PCH is not permitted, so we use fatal_error if we detect
relocation is needed. We also remove all the old code which tries to
relocate and issues a sorry().

In review, the old behaviour is kept for all targets *except*
i686-mingw32 and darwin. These targets have been augmented based on the
new behaviour of HOST_HOOKS_GT_PCH_USE_ADDRESS.

2006-12-13  Carlos O'Donell  <carlos@codesourcery.com>

	gcc/
	* hooks.c (hook_int_voidp_size_t_voidp_size_t_int_0): New function.
	(hook_voidp_size_t_int_null): Likewise.
	* hooks.h: Add new declarations.
	* ggc.h: Likewise.
	* hosthooks-def.h (HOST_HOOKS_GT_PCH_USE_ADDRESS): Default to
	hook_int_voidp_size_t_voidp_size_t_int_0.
	(HOST_HOOKS_GT_PCH_GET_ADDRESS): Default to
	hook_voidp_size_t_int_null.
	* gcc/doc/hostconfig.texi (HOST_HOOKS_GT_PCH_USE_ADDRESS): Adjust
	documentation with respect to returning zero.

	Backport from mainline:
	gcc/
	2004-06-05  Danny Smith  <dannysmith@users.sourceforge.net>
	* toplev.c (init_asm_output): Add explicit 'b' to mode when
	opening asm_out_file.
	* c-pch.c (c_common_write_pch): Remove unnecessary fflush before
	reading asm_out_file. Replace fflush after reading asm_out_file
	with fseek.
	* hosthooks-def.h (HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY): Define
	default and add to HOST_HOOKS_INITIALIZER.
	* hosthooks.h (gt_pch_alloc_granularity): Declare hook function.
	* ggc-common.c (default_gt_pch_alloc_granularity): New function.
	(gt_pch_save): Use host_hooks.gt_pch_alloc_granularity
	to set mmi.offset padding.
	 * config.gcc (i[34567]86-*-mingw32*): Set target_gtfiles to
	$(srcdir)/config/i386/winnt.c.
	(i[34567]86-*-pe | i[34567]86-*-cygwin*): Likewise.
	(i[34567]86-*-uwin*): Likewise.
	*i[34567]86-*-interix3*): Likewise.
	* config.host (i[34567]86-*-mingw32*): Set out_host_hook_obj.
	* config/i386/host-mingw32.c: New file.
	* config/i386/x-mingw32: Add rule for host-mingw32.o.
	* config/i386/winnt.c: (struct extern_list) Tag as GTY.
	(extern_head): Likewise.
	(struct export_list) Likewise.
	(export_head): Likewise.
	(i386_pe_record_external_function): Use ggc_alloc.
	(i386_pe_record_exported_symbol): Likewise.
	Include "gt-winnt.h" at end.
	* doc/hostconfig.texi: Document
	HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY.

	2004-03-10  Richard Henderson  <rth@redhat.com>
	* c-pch.c (c_common_no_more_pch): Update for gt_pch_use_address
	extra arguments.
	* hosthooks.h (struct host_hooks): Update gt_pch_get_address
	and gt_pch_use_address.
	* doc/hostconfig.texi: Update docs.
	* config/rs6000/host-darwin.c (darwin_rs6000_gt_pch_get_address):
	Update for changed definition.
	(darwin_rs6000_gt_pch_use_address): Likewise.

	2004-03-04  Ian Lance Taylor  <ian@wasabisystems.com>
	* ggc-common.c (gt_pch_restore): Don't unmap addr unless we are
	going to call mmap again.  Read the file into the right place.
	Give a fatal error if we have to relocate.



git-svn-id: https://gcc.gnu.org/svn/gcc/branches/csl-gxxpro-3_4-branch@119868 138bc75d-0d04-0410-961f-82ee72b054a4

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