[PATCH,RFC] collect2 LTO for AIX

[David Edelsohn <dje dot gcc at gmail dot com>]

The attached patch is an incremental step toward GCC LTO on AIX.  The
recent Libiberty Simple Object improvements for XCOFF provide more
capabilities for operations on XCOFF object files, which are a
prerequisite for GCC LTO functionality.

This patch adds the basic LTO scanning pass to the COFF support in
collect2.  I don't believe that this change should affect other COFF
targets adversely (do they even use collect2?), but I wanted to give
people an opportunity to comment.

(Yes, the formatting is messy, but all of collect2.c is messy.)

Bootstrapped on powerpc-ibm-aix7.2.0.0

Thanks, David

* collect2.c (add_lto_object): Compile for OBJECT_COFF.
(scan_prog_file): Don't skip PASS_LTOINFO. Scan for LTO objects.

Attachment: collect2-aix-lto.txt
Description: Text document