RFA: GOLD: Allow INPUT linker script commands to input libraries

[Nick Clifton]

Hi Ian,

  Currently GOLD's implementation of the INPUT linker script command
  does not support inputting libraries via the "-l<name>" syntax.  This
  is a problem as some current Linux libraries make use of this
  feature.  Eg the 64-bit version of the wide-character ncurses library
  looks like this:

    % cat /usr/lib64/libncursesw.so
    INPUT(libncursesw.so.5 -ltinfo)

  The attached patch is my poor attempt at adding support for this
  feature.  It works for the small test case I have been using locally,
  but I would certainly some guidance as to whether it is acceptable for
  inclusion into the gold sources.

  (Incidentally I wanted to put the check for the 'l' character in the
  "-l<name>" sequence into the yyscript.y file, but I could not get this
  to work.  I think that my bison-fu must be weak).

Cheers
  Nick

gold/ChangeLog
2010-06-08  Nick Clifton  <nickc@redhat.com>

	* yyscript.y (input_list_element): Allow strings prefixed with
	the '-' character.  Treat these as libraries.
	* script.cc (script_add_library): New function.  Adds a library
	specified by "-l<name>" found in an input script.
	* script-c.h: Add prototype for script_add_library.

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