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redboot w/o gdb stubs


With this patch one can disable the stubs in a gdb build. Setting this
to 0 allows disabling CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS in the hal
common cdl. This just moves the requirement for stubs to a separate cdl
option I don't know enough CDL to make it control that other option in
hal common.
I see this has come up at least 3 times in the past and unless you find
something bogus with it it would be nice to have it in CVS.
If so I'll send a changelog entry and a patch for powerpc so that builds
without stubs.

On ARM this means 15-20 K of code and 10K of BSS less for a redboot
build. For powerpc 15K code and 6K bss for the single platform I built
for.

Comments?

Jani

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