[Bug 1001344] Allow nc_test_slave for lwIP to compile for targets with 128KiB RAM.

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--- Comment #27 from Jonathan Larmour <jifl@ecoscentric.com> 2012-05-17 18:45:11 BST ---
(In reply to comment #26)
> 
> CYGBLD_ATTRIB_UNUSED, contrary to what it's name implies, will keep the
> variable. Ref: Bug 1001520

Oh yes, I'd already forgotten that conversation. The GCC documentation is still
unclear on that point. In that case, we needed a memory access to a particular
location. That happened courtesy of derefencing a volatile pointer set to an
absolute address.

I think this case might be a little different though as the volatile variable
has entirely local scope. No manufactured addresses are involved that could (in
principle) be affected by other agents.

I wonder if you can use both USED and UNUSED at the same time. Given their
intended functions, you should be able to, despite the English meanings
implying they are in some way opposites to each other. That would deal with the
uncertainty.

Jifl

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