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[patch pe-coff]: Add support for IAT directory field

Hello,

this patch implements to set correct values to the IAT directory entry
in PE's optional header.  This field is mainly of interest for driver
development on windows and (AFAIK) for wince mobil.  I provided this
patch some time ago for further enhancements, but now I got also a
request to support this feature for x86 & x64 windows binaries. So I
reworked patch a bit. As I don't have an arm wince to check this
patch, I would like to ask here to get feedback about wince from one
of its maintainers.

ChangeLog bfd

2010-09-16  Kai Tietz

	* peXXigen.c (_bfd_XXi_final_link_postscript):
	Add handling for setting IAT directory entry.

ChangeLog ld

2010-09-16  Kai Tietz

	* emultempl/pe.em (gld_${EMULATION_NAME}_place_orphan): Add
	idata to orphan set.
	* emultempl/pep.em: Likewise.
	* scripttempl/armcoff.sc: Separate idata
	and add __IAT_start__ and __IAT_end__ labels.
	* scripttempl/pe.sc: Likewise.
	* scripttempl/pep.sc: Likewise.

Tested for x86_64-w64-mingw32, i686-pc-cygwin, i686-pc-mingw32, and
roughly for wince-arm target. Ok for apply?

Regards,
Kai

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