[PATCH] Add -g switch to GAS

[Nick Clifton]

Hi Guys,

  I am applying the patch below to add a -g switch to GAS.  This
  switch behaves in the same way as GCC's -g switch, ie it enables the
  generation of debugging information in the format preferred by the
  assembler's target.

  The patch also adds a -gdwarf-2 switch as a synonym for -gdwarf2 so
  that GAS now uses the same nomenclature are GCC.

  A new target macro is included: MD_DEBUG_FORMAT_SELECTOR, which if
  defined by a backend will be called to select the preferred debug
  format.  Otherwise DWARF2 will be selected for ELF targets and STABS
  for others.  The patch does not define any implementations of the
  MD_DEBUG_FORMAT_SELECTOR macro, but these can be added later if
  necessary.

  The patch also clears up the behaviour of the md_parse_option
  function.  This function should always return zero if it did not
  handle the option, and it should not print any messages about the
  option being ignored because there might be further, generic
  processing that can be done.

Cheers
    Nick

gas/ChangeLog
2004-08-17  Nick Clifton  <nickc@redhat.com>

	* as.c (MD_DEBUG_FORMAT_SELECTOR): Provide default definition.
	(show_usage): Add -g.
	(std_longopts): Add --gen-debug.  Alpha sort the table.
	(parse_args): Print an error message if a switch is not handled.
	Handle the -g switch, calling md_debug_format_selector() if
	necessary.
	* NEWS: Mention new feature.
	* doc/as.texinfo: Document new switch.
	* doc/internals.texi: Document behaviour of md_parse_option.
	
	* config/tc-arm.c (md_parse_option): Do not issue an error message
	if the switch is not recognised.
	* config/tc-m68k.c (md_parse_option): Likewise.
	* config/tc-pdp11.c (md_parse_option): Likewise.
	* config/tc-v850.c (md_parse_option): Likewise.

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