[Simh] clang (was Re: XCode and LTO)

[Nelson H. F. Beebe]

>> Declaring "loopval" as volatile (and perhaps global, rather than on-stack, to 
>> reduce chances of compiler disregarding volatile declaration) might do the 
>> trick.

Yes, that should work if the compiler obeys volatile declarations.  Otherwise,
a store subterfuge will work too:

(a)	volatile int foo;

(b)	int foo;
	...
	store(&foo);

	In another file:
	void store(int *x) { }

Both cases should force the compiler to load foo from memory, and
not optimize it away.

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