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by sherincall
2552 days ago
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Modern compilers do have insight into the source before it was preprocessed. You'll notice that clang and (modern) gcc will show you where the error is in the unexpanded source line, and then show the expansion of the macros. So when it detects "2^32", it can look back to see if it was a product of macro expansion or if the literal was directly written, and warn accordingly. Interestingly, msvc can also do this, by virtue of not even having a distinct preprocessor phase at all. |
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