Remove unused #define

[laurentlb]

If there's a #define in a file, but the macro is not used anywhere, we should delete it.

With the preprocessor, this will become common:

#define PRETTIER 1

#ifdef PRETTIER
...
#endif

The preprocessor can evaluate and remove the #ifdef line, but it doesn't know if the macro should be preserved or not.

[eldritchconundrum]

Gotta implement actual replacement of tokens in the code... Then the #define can always be deleted.

[laurentlb]

We don't want to remove all defines, just the ones that are not used.

[eldritchconundrum]

Evaluating and removing defines could yield a smaller output.

[laurentlb]

Or in many cases, larger...

In any case, inlining the defines is an independent feature request.