Allow modifying macro tokens at parse time #3211
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This a rerun of PR #2119. The goal is to provide a callback to allow modifying the tokens when parsing macros to handle values that are non-standard. As described in the original PR, I have several header files which contains things like:
In my specific case, these values are later on used within a ternary operator. This PR enables transforming those values into a valid integer that generates a valid integer constant.