[reSIProcate] Huge usage of stack space for debug builds

[Alan Stokes]

I'm running on Windows with the Microsoft 7.1 compiler. I'm currently using 
debug builds of everything (because I'm just getting started, and I want 
problem-solving to be as easy as possible when I do something stupid).

I notice that even a minimal unit test takes a huge amount of stack space 
(more than the default 1MB). The Dialog constructor alone takes 168kB. This 
all comes from the 8k buffers allocated for every call to GenericLog (in its 
various guises). With optimisations turned off (as they are in debug mode) 
the compiler allocates a separate buffer for each call - I assume in release 
mode it's smart enough to realise the lifetimes are non-overlapping and use 
the same buffer for everything.

I was wondering where the default size of 8k comes from? It seems very high. 
After all, most log messages tend to be fairly short, and the system will 
grow the buffer as needed for long messages (with the downside of needing to 
touch the heap). In my own code I do something similar, but set the default 
size to 40 bytes (perhaps a touch low).

- Alan
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