PATCH [v2]: makes --gc-sections compatible with -r/-q

[Tristan Gingold <gingold at adacore dot com>]

> You need to modify gc_sweep_hook to cope with -r for all targets.
> Also, Eric's change, "Add missing guard", is not the proper fix for
> ppc_elf_gc_sweep_hook.  You should instead exit ppc_elf_gc_sweep_hook
> immediately if -r, because that is what ppc_elf_check_relocs does.

Ok, here is the new version of the patch.

* makes all gc_sweep_hook coherent with check_relocs (ie exit  
immediately if -r)
* --gc-section -r requires a non-default entry point
* document in --gc-section the use of -e

Tristan.

Attachment: ld-gc.diffs2
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