[PATCH] Support .gnu.lto_.lto section in ELF files (PR 24768).

[Martin Liška]

Hi.

The patch adds detection of a new LTO ELF section that will eventually
replace presence of the __gnu_lto_slim symbol detection. So, first I would
like to teach binutils about the section and later then (after some years),
detection based on __gnu_lto_slim symbol can be removed.

Ready for trunk?
Thanks,
Martin

bfd/ChangeLog:

2019-07-22  Martin Liska  <mliska@suse.cz>

	PR 24768
	* archive.c (_bfd_compute_and_write_armap): Come up with
	report_plugin_err variable.
	* bfd-in2.h (struct bfd): Add lto_slim_object flag.
	* elf.c (struct lto_section): New.
	(_bfd_elf_make_section_from_shdr): Parse content of
	.gnu_lto_.lto section.
	* elflink.c: Report error for a missing LTO plugin.
	* linker.c (_bfd_generic_link_add_one_symbol): Likewise.

binutils/ChangeLog:

2019-07-22  Martin Liska  <mliska@suse.cz>

	PR 24768
	* nm.c (filter_symbols): Set report_plugin_err if
	error is reported.
	(display_rel_file): Report error for a missing LTO plugin.

gold/ChangeLog:

2019-07-22  Martin Liska  <mliska@suse.cz>

	PR 24768
	* layout.h (class Layout): Add is_lto_slim_object and
	set_lto_slim_object.
	* object.cc (struct lto_section): Add lto_slim_object_.
	(big_endian>::do_layout): Parse content of
	.gnu_lto_.lto section.
	(big_endian>::do_add_symbols): Report error for a missing
	LTO plugin.
---
 bfd/archive.c  | 21 +++++++++++++++++----
 bfd/bfd-in2.h  |  3 +++
 bfd/elf.c      | 23 +++++++++++++++++++++++
 bfd/elflink.c  |  6 ++++++
 bfd/linker.c   | 24 ++++++++++++++++++------
 binutils/nm.c  | 23 ++++++++++++++++++++---
 gold/layout.h  | 10 ++++++++++
 gold/object.cc | 31 ++++++++++++++++++++++++++++++-
 8 files changed, 127 insertions(+), 14 deletions(-)


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