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Global const data
=================
SLUL will not have global mutable data.
But it will have global constant data (e.g. a constant array of bytes).
Requirements for globals:
1. Must be constant/immutable.
2. Must be compile-time constants / Cannot have initializers.
3. Must not be (or contain) references
(that would require initializers / would not be compile-time constant)
4. Must be architecture-independent
(otherwise it can overflow or create an invalid array index on
some platforms, but not on other).
Problems:
"wuint i = large_number + 1"
"int i = large_number + 1"
- this gives different behavior depending on the size of int.
- requiring int = 32 bits is probably a very good idea anyway,
except for embedded platforms.
=> forbid wuint in const-exprs if "\option allow16" is in enabled?
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