* 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.
From-SVN: r151157
