Commit: Add --warn-orphan option to the linker

[Nick Clifton]

Hi Guys,

  I am applying the attached patch to add a small new feature to the
  linker: a command line option --warn-orphan that generates a warning
  message whenever a orphan section is placed into the output file.
  Whilst this information could be discovered by parsing a map generated
  by the --map option, this new option makes it simpler and easier to
  discover orphan sections, which should help when writing linker
  scripts.

Cheers
  Nick

ld/ChangeLog
2015-04-07  Nick Clifton  <nickc@redhat.com>

	* ld.h (struct ld_config_type): Add new field: warn_orphan.
	* ldlex.h (enum option_values): Add OPTION_WARN_ORPHAN and
	OPTION_NO_WARN_ORPHAN.
	* lexsup.c (ld_options): Add --warn-orphan and --no-warn-orphan.
	(parse_args): Handle the new options.
	* ldemul.c (ldemul_place_orphan): If requested, generate a warning
	message when an orphan section is placed in the output file.
	* ld.texinfo: Document the new option.
	* NEWS: Mention the new feature.

ld/testsuite/ChangeLog
2015-04-07  Nick Clifton  <nickc@redhat.com>

	* ld-elf/orphan-5.l: New test - checks the linker's output with
	--warn-orphan enabled.
	* ld-elf/elf.exp: Run the new test.

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