Norman Ramsey <n...@cs.tufts.edu> writes:
> I'm writing client code against the GHC API in HEAD (version 9.3),
> using 9.0.1 as my bootstrap compiler. To make it possible to build
> this code, I've set up cabal using
>
> cabal v1-configure \
> --package-db clear \
> --package-db $STAGE0/lib/package.conf.d/ # stage0 libraries
>
> In my Haskell code I'm invoking `runGhc (Just thelibdir)` where
>
> thelibir = "/home/nr/asterius/ghc/_build/stage0/lib"
>
> which is my `$STAGE0/lib`.
>
> Unfortunuately, when I launch my app, `setSessionDynFlags` panics.
> The output, along with some diagnostic information about some dflags
> that seemed relevant, looks like this:
>
> libdir = /home/nr/asterius/ghc/_build/stage0/lib
> includePaths = IncludeSpecs {includePathsQuote = [], includePathsGlobal =
> [], includePathsQuoteImplicit = []}
> libraryPaths = []
> packageDBFlags = []
> packageEnv = Nothing
> panic! (the 'impossible' happened)
> GHC version 9.3.20210918:
> GHC couldn't find the RTS constants (#define HS_CONSTANTS ") in
> /home/nr/.ghcup/ghc/9.0.1/lib/ghc-9.0.1/include/DerivedConstants.h: the RTS
> package you are trying to use is perhaps for another GHC version(e.g. you are
> using the wrong package database) or the package database is broken.
>
> CallStack (from HasCallStack):
> error, called at
> _build/stage0/compiler/build/GHC/Platform/Constants.hs:143:20 in
> ghc:GHC.Platform.Constants
>
> Please report this as a GHC bug: https://www.haskell.org/ghc/reportabug
>
> I'm a little suprprised that my app is hunting for 9.3 information in
> the tree that belongs to the bootstrap compiler.
>
I suspect that the stages are getting mixed up here. Would it be
possible to post a full reproducer? I'd be happy to investigate further,
but without being able to reproduce locally it's a bit hard to say
anything useful. My recollection is that we look for DerivedConstants.h
in the usual include paths, so there are many ways in which things could
go wrong.Cheers, - Ben
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