I gathered some info about this on https://gitlab.haskell.org/ghc/ghc/-/issues/21329, but there is also an issue where Cabal also doesn't know to build or use dyn+prof things (which caused me to give up at the time). With just ghc I managed to get it working (also noted in the ticket), but that is outdated now since this was before hadrian. I don't think there's any fundamental reason. I would like it to work! Cheers, A On Thu, 1 Feb 2024, at 11:15, Alexis King wrote:

Hello all,

GHC does not support combining -prof and -dynamic. Various places note that these are incompatible, but I have never managed to find a rationale for this incompatibility. I am sure there a good reasons exists, but I am not sure what it is.

Does anyone know the reason? And, even better, is the reason written down somewhere? I’d love to understand this better.

Thanks, Alexis

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