Commit: Improve readelf's selection of file symbols for GNU build notes

[Nick Clifton]

Hi Guys,

  I am applying the attached patch to make a couple of improvements to
  readelf's selection of file symbols when display GNU build attribute
  notes.   The first is to skip the mapping symbols ($a, $x, etc) used
  by ARM and AARCH64 targets.

  The second improvement is to cope with a change in version 5 of the
  annobin gcc plugin.  With this version the file start symbol created
  by the plugin is no longer assigned to the start of the file, as this
  breaks too many other programs.  Instead the file start symbol is set
  to two bytes into the file.  So the patches changes readelf so that if
  it cannot find a symbol at the start of the file, it will look for one
  two bytes into the file.

  Tested with a large variety of different targets.

Cheers
  Nick

binutils/ChangeLog
2018-03-23  Nick Clifton  <nickc@redhat.com>

	* readelf.c (get_symbol_for_build_attribute): Skip ARM mapping
	symbols.
	(print_gnu_build_attribute_description): If no file start symbol
	could be found, look for one two bytes into the file.
	* testsuite/binutils-all/note-4-64.s: Set the address of the file
	start symbol to two bytes into the file.
	* testsuite/binutils-all/note-4-32.s: Likewise.

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