This patch adds the ability to see in shorten_compare that a constant comes from an enumeral type. It does so by using in both C/C++ the existing infrastructure from the C FE (c_expr). Currently, only the C FE carries down the correct information to avoid warning, so C++ still warns. However, this patch also opens the possibility to pass down this info in the C++ FE using c_expr, and avoid warning in a follow up patch.
Bootstrapped and regression tested. This is a proof-of-concept, so I don't provide a changelog or update the comments of new/existing functions. Comments? Is this approach OK? Cheers, Manuel.
fix-pr51712-2.diff
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