[0/8] Refactor dwarf-reader: split out ELF helpers

  The abg-dwarf-reader.cc has grown into a large compilation unit with a lot of
responsibilities. This does not only affect the compilation time, but also
readability of the various implementation details. Hence it makes sense to
attempt a refactoring of parts of it.

To overcome the above and as a preparation for my future work on the symtab
reading part, this splits out functionality from the dwarf reader into a new
set of source files: src/elf-helpers.{h,cc} along with a test that so far only
serves the purpose of ensuring that the header file can be compiled on its own.

The elf-helpers, sensibly not named elf-utils, contain functionality like
looking up sections, converting values or deducting information and properties
in some way from an Elf* handle. They are not exposed to libabigail users as
they are an implementation detail of libabigail.

This set of changes is only a refactoring with minor cleanups and renames and
any change to the functionality would be unintentional.

Cheers,
Matthias

Matthias Maennich (8):
  abg-dwarf-reader split: create abg-elf-helpers.{h,cc} and test case
  abg-elf-helpers: move some elf helpers from abg-dwarf-reader
  abg-elf-helpers: move some versioning helpers from abg-dwarf-reader
  abg-elf-helpers: move some kernel helpers from abg-dwarf-reader
  abg-elf-helpers: consolidate the is_linux_kernel* helpers
  abg-dwarf-reader: migrate more ELF helpers to elf-helpers
  abg-elf-helpers: migrate more elf helpers (architecture specific
    helpers)
  abg-elf-helpers: migrate maybe_adjust_et_rel_sym_addr_to_abs_addr

 src/Makefile.am           |    2 +
 src/abg-dwarf-reader.cc   | 1209 ++-----------------------------------
 src/abg-elf-helpers.cc    | 1031 +++++++++++++++++++++++++++++++
 src/abg-elf-helpers.h     |  183 ++++++
 tests/.gitignore          |    1 +
 tests/Makefile.am         |    6 +-
 tests/test-elf-helpers.cc |   30 +
 7 files changed, 1295 insertions(+), 1167 deletions(-)
 create mode 100644 src/abg-elf-helpers.cc
 create mode 100644 src/abg-elf-helpers.h
 create mode 100644 tests/test-elf-helpers.cc