Re: [ping] fix collect2/aix not to drag every ar-object with eh tables

[Olivier Hainque <hainque at adacore dot com>]

Hello,

PING for http://gcc.gnu.org/ml/gcc-patches/2009-07/msg00428.html

patch/ChangeLog re attached here, with minor change to account for the
recent introduction of "output_fde" in dwarf2out.c.

Thanks in advance,

Olivier

2009-08-14  Olivier Hainque  <hainque@adacore.com>

	* collect2.c (DO_COLLECT_EXPORT_LIST): New internal macro,
	always defined.  Reflect definition or absence of such for
	COLLECT_EXPORT_LIST.  Readability helper.
	(scanfilter): New enum, to help control what symbols
	are to be considered or ignored by scan_prog_file.
	(enum pass): Rename as "scanpass", moved together with scanfilter
	prior to scan_prog_file's prototype.
	(scan_prog_file): Accept and honor scanpass and scanfilter arguments.
	Group prototype with the scanpass/scanfilter definitions, factorize
	head comments for the several implementations at the prototype.
	(main): Reorganize the first pass link control to let AIX
	drag only the needed frame tables in executables.  Prevent
	frame tables collection during the scan aimed at static ctors.
 	Pre-link and scan for frame tables later to compensate.

	* doc/tm.texi (ASM_OUTPUT_DWARF_TABLE_REF): New macro.
	A C statement to issue assembly directives that create a reference
	to the given DWARF table identifier label from the current function
	section.
	* dwarf2out.c (switch_to_eh_frame_section): Add a BACK argument
	to differentiate first time section entry.  Only emit a .data
	tables start identifier label the first time around.
	(switch_to_frame_table_section): New function.  Helper for
	output_call_frame_info to switch possibly BACK into the eh_frame
	or the debug_frame section depending on FOR_EH.
	(output_call_frame_info): Use helper to first enter the proper
	frame section.
	(output_fde): Use ASM_OUTPUT_DWARF_TABLE_REF when defined to
	emit a link to the frame table start label from each function
	section.
	* config/rs6000/rs6000.c (rs6000_aix_asm_output_dwarf_table_ref):
	New function.  Implementation of ASM_OUTPUT_DWARF_TABLE_REF.
	* config/rs6000/rs6000-protos.h: Declare it.
	* config/rs6000/aix.h (ASM_OUTPUT_DWARF_TABLE_REF): Define.

Attachment: collect-tables.dif
Description: Text document