waf: compiler flags, uninitalized variable

[Hal Murray]

> The other thing I forgot to mention is that sometimes the control-flow
> analysis isn't as good in older compilers, leading to complaints about
> something being used uninitialized in a case where the code couldn't
> actually be reached in the unininitialized case.  Unless there's a good
> reason to avoid it, usually the best fix is just to add an initializer to
>  the declaration, even if it's not logically necessary. 

I usually add a "keep compiler happy" comment to that sort of code.

If I see that sort of code without a comment, I looking for it.

The example that started this thread was really simple.

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