Hi Gavin,
> You are a genius. Thanks.
I'm often told I "full of it". ;-)
But it was not I that pointed this out, but Nick Burrett.
http://www.riscos.info/pipermail/gcc/2015-September/006473.html
> I guess I had not properly appreciated what 'const' meant.
I recommend Chris Lattner's three posts on what a C compiler can assume;
I think you may be surprised. It starts with
http://blog.llvm.org/2011/05/what-every-c-programmer-should-know.html
Cheers, Ralph.
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