I'd suspect it's your boot compiler producing that error, and that what changed might have been the file being compiled, causing a recompile with the wrong compiler?
On Wed, Mar 25, 2026 at 8:53 AM Simon Peyton Jones via ghc-devs < [email protected]> wrote: > Friends > > After 10 days of working on !15719 I have suddenly started getting > > /home/simonpj/code/HEAD-19/libraries/ghc-boot-th-next/../ghc-internal/src/GHC/Internal/Classes.hs:10:17: > error: [GHC-04924] > Unknown flag in {-# OPTIONS_GHC #-} pragma: -fdefines-known-key-names > | > 10 | {-# OPTIONS_GHC -fdefines-known-key-names #-} > | ^^^^^^^^^^^^^^^^^^^^^^^^^ > > > I have no idea why this was fine until 10am this morning, and has suddenly > started happening now. > > *How does GHC decide what runtime flags it allows? * > `-fdefines-known-key-names` is in GHC.Driver.Session.fFlagsDeps. > > > I'm boggled that it worked until 10am and then abruptly stopped. > > Any advice? > > Simon > > _______________________________________________ > ghc-devs mailing list -- [email protected] > To unsubscribe send an email to [email protected] > -- brandon s allbery kf8nh [email protected]
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