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* Makefile.in (host_hook_obj): New.
(OBJS): Add $(host_hook_obj).
(host_default.o): New rule.
* config.gcc (host_hook_obj): New, default to host-default.o.
(powerpc-*-darwin*): Use host-darwin.o.
(out_host_hook_obj): New.
* configure: Regenerate.
* configure.in: Print information about out_host_hook_obj, substitute
into output files.
* host-default.c: New file.
* hosthooks.h: New file.
* toplev.c (general_init): Call host_hooks.extra_signals.
* config/rs6000/host-darwin.c: New file.
* config/rs6000/x-darwin: New file.
* doc/hostconfig.texi: Add documentation for new host hook.
Rearrange existing documentation.
From-SVN: r62470
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