PATCH: makes --gc-sections compatible with -r/-q

[Alan Modra]

On Tue, Jan 08, 2008 at 03:21:28PM +0100, Tristan Gingold wrote:
> this simple patch removes the incompatibility between --gc-sections  
> and -r or -q.
> This feature is useful for VxWorks (whose loadable binaries are  
> compiled with -r or -q) as well as
> for EFI modules.
> 
> We (= AdaCore) are using it for a long time on VxWorks as we are  
> compiling the Gnat run time with
> --gc-sections.
> 
> This patch was test only for ppc-vxworks and i586-linux targets (on a  
> i586-linux host).

Not just only tested on ppc and i586, but only written for ppc and
i586.  Not OK without some more work.

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.

-- 
Alan Modra
Australia Development Lab, IBM