Ah, so you beat me to it Neil. ;) Out of curiosity, how much worse was it before you started fixing things?
As I recall, not too different than things are today -- sparse flagged a bunch of stylistic issues that I fixed, like:
void some_func() { ... } => void some_func(void) { ... }
extern void some_func(void) { ... } => void some_func(void) { ... }
etc. But given that there are 3000 odd warnings (mostly bogus), I doubt I made a significant dent on the total warning count.
Also, I don't recall sparse picking up any significant errors or problems. As I said, I've been meaning to explore if that's all that sparse can do -- I just looked at the lowest of the low-hanging fruit.
-Neil
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