RFA/RFC: Enable both gold and ld in a single toolchain

[Nick Clifton]

Hi Guys,

   Now that the GCC mainline sources are back in stage 1, and I am back 
from vacation, here is another revised version of the gold-and-ld patch 
for consideration, and I hope, approval.

   This version fixes collect2.c so that it will build even if the 
DEFAULT_LINKER environment variable is defined.  It also changes the 
name of the installed version of the gold linker to be ld.gold in order 
to use a consistent naming scheme.

   OK to apply ?

Cheers
   Nick

./ChangeLog
2010-04-09  Roland McGrath  <roland@redhat.com>
         H.J. Lu  <hongjiu.lu@intel.com>

     * configure.ac (--enable-gold): Support both, both/gold and
     both/bfd to add gold to configdirs without removing ld.
     * configure: Regenerated.

gold/ChangeLog
2010-04-09  H.J. Lu  <hongjiu.lu@intel.com>
         Nick Clifton  <nickc@redhat.com>

     * configure.ac (install_as_default): Define and set to false
     unless --enable-gold or --enable-gold=both/gold has been
     specified.
     * configure: Regenerate.
     * Makefile.am (install-exec-local): Install the executable as
     'ld.gold'.  If install_as_default is true then also install it as
     'ld'.
     * Makefile.in: Regenerated.

ld/ChangeLog
2010-04-09  H.J. Lu  <hongjiu.lu@intel.com>
         Nick Clifton  <nickc@redhat.com>

     * configure.in (install_as_default): Define and set to true
     unless --enable-gold=both/gold has been specified.
     * configure: Regenerate.
     * Makefile.am (transform): Use ld.bfd as the default name of
     the linker.
     (install-exec-local): Also install the executable as a binary
     named 'ld' if install_as_default is true.
     * Makefile.in: Regenerate.

gcc/ChangeLog
2010-04-09  Nick Clifton  <nickc@redhat.com>

     * configure.ac (gcc_cv_gold_srcdir): New cached variable -
     contains the location of the gold sources.
     (ORIGINAL_GOLD_FOR_TARGET): New substituted variable - contains
     the name of the locally built gold executable.
     * configure: Regenerate.
     * collect2.c (main): Detect the -use-gold and -use-ld switches
     and select the appropriate linker, if found.
     If a linker cannot be found and collect2 is executing in
     verbose mode then report the search paths examined.
     * exec-tool.in: Detect the -use-gold and -use-ld switches and
     select the appropriate linker, if found.
     Add support for -v switch.
     Report problems locating linker executable.
     * gcc.c (LINK_COMMAND_SPEC): Translate -fuse-ld=gold into
     -use-gold and -fuse-ld=bfd into -use-ld.
     * common.opt: Add fuse-ld=gold and fuse-ld=bfd.
     * opts.c (comman_handle_option): Ignore -fuse-ld=gold and
     -fuse-ld=bfd.
     * doc/invoke.texi: Document the new options.

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