[PATCH v2] Improve building with LTO

[Dmitry V. Levin]

On Sat, Aug 28, 2021 at 12:31:43PM +0300, Dmitry V. Levin wrote:
> On Thu, Feb 18, 2021 at 03:38:56AM +0100, Alexander Miller via Elfutils-devel wrote:
> > From: Alexander Miller <alex.miller@gmx.de>
> > 
> > Use symver attribute for symbol versioning instead of .symver
> > assembler directive when available. Convert to use double @ syntax
> > for default version in all cases (required when using the attribute).
> > 
> > Add the attributes externally_visible, no_reorder if available when
> > using assembler directives to improve the situation for < gcc-10.
> > This is not 100% reliable, though; -flto-partition=none may still be
> > needed in some cases.
> > 
> > Note that -Wno-error=stack-usage= is still needed to build with LTO.
> > 
> > Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=24498
> > Signed-off-by: Alexander Miller <alex.miller@gmx.de>
> > ---
> >  lib/ChangeLog                  | 13 +++++++
> >  lib/eu-config.h                | 65 +++++++++++++++++++++++++++-------
> >  libdw/ChangeLog                | 11 ++++++
> >  libdw/dwarf_aggregate_size.c   |  4 +--
> >  libdw/dwarf_arrayorder.c       |  2 +-
> >  libdw/dwarf_bitoffset.c        |  2 +-
> >  libdw/dwarf_bitsize.c          |  2 +-
> >  libdw/dwarf_bytesize.c         |  2 +-
> >  libdw/dwarf_decl_column.c      |  2 +-
> >  libdw/dwarf_decl_file.c        |  2 +-
> >  libdw/dwarf_decl_line.c        |  2 +-
> >  libdw/dwarf_srclang.c          |  4 +--
> >  libdwelf/ChangeLog             |  5 +++
> >  libdwelf/dwelf_elf_begin.c     |  2 +-
> >  libdwfl/ChangeLog              |  7 ++++
> >  libdwfl/core-file.c            |  4 +--
> >  libdwfl/dwfl_module_build_id.c |  4 +--
> >  libdwfl/dwfl_report_elf.c      |  4 +--
> >  18 files changed, 107 insertions(+), 30 deletions(-)
> 
> ping?

FWiW, I applied this patch in ALT's elfutils package about 2 months ago.
Thanks to -Wstack-usage fixes merged, it no longer requires
-Wno-error=stack-usage= to build with LTO.


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