Compiling packages seems to fail unless `shared: True` is set in `cabal.project`

[hasufell]

E.g. when trying to compile ghcup with a dynamic stable-haskell GHC, I get:

Failed to build host:directory-ospath-streaming-0.3-36314961506d372e9056f2aede13bfdfe30e9a034e346dbbc2d22b033cf11864.
Build log ( /home/hasufell/git/ghcup-hs/dist-newstyle/logs/host/x86_64-portbld-freebsd/directory-ospath-streaming-0.3-36314961506d372e9056f2aede13bfdfe30e9a034e346dbbc2d22b033cf11864 ):
Configuring library for directory-ospath-streaming-0.3...
Preprocessing library for directory-ospath-streaming-0.3...
Building library for directory-ospath-streaming-0.3...
[1 of 7] Compiling System.Directory.OsPath.Types ( src/System/Directory/OsPath/Types.hs, /home/hasufell/git/ghcup-hs/dist-newstyle/build/host/x86_64-portbld-freebsd/directory-ospath-streaming-0.3-36314961506d372e9056f2aede13bfdfe30e9a034e346dbbc2d22b033cf11864/build/System/Directory/OsPath/Types.o, /home/hasufell/git/ghcup-hs/dist-newstyle/build/host/x86_64-portbld-freebsd/directory-ospath-streaming-0.3-36314961506d372e9056f2aede13bfdfe30e9a034e346dbbc2d22b033cf11864/build/System/Directory/OsPath/Types.dyn_o )
[2 of 7] Compiling System.Directory.OsPath.FileType ( src/System/Directory/OsPath/FileType.hs, /home/hasufell/git/ghcup-hs/dist-newstyle/build/host/x86_64-portbld-freebsd/directory-ospath-streaming-0.3-36314961506d372e9056f2aede13bfdfe30e9a034e346dbbc2d22b033cf11864/build/System/Directory/OsPath/FileType.o, /home/hasufell/git/ghcup-hs/dist-newstyle/build/host/x86_64-portbld-freebsd/directory-ospath-streaming-0.3-36314961506d372e9056f2aede13bfdfe30e9a034e346dbbc2d22b033cf11864/build/System/Directory/OsPath/FileType.dyn_o )
src/System/Directory/OsPath/FileType.hs:30:1: error: [GHC-47808]
    Failed to load dynamic interface file for System.Posix.Files.PosixString:
      Exception when reading interface file  /home/hasufell/git/ghcup-hs/dist-newstyle/store/host/x86_64-portbld-freebsd/lib/unix-2.8.8.0-45ca9ee32595cfa83b4984aad95b19e2f444050985074ff84a88f20a55c58ffc/System/Posix/Files/PosixString.dyn_hi
        /home/hasufell/git/ghcup-hs/dist-newstyle/store/host/x86_64-portbld-freebsd/lib/unix-2.8.8.0-45ca9ee32595cfa83b4984aad95b19e2f444050985074ff84a88f20a55c58ffc/System/Posix/Files/PosixString.dyn_hi: withBinaryFile: does not exist (No such file or directory)
   |
30 | import qualified System.Posix.Files.PosixString as PosixF
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

[4 of 7] Compiling System.Directory.OsPath.Utils ( src/System/Directory/OsPath/Utils.hs, /home/hasufell/git/ghcup-hs/dist-newstyle/build/host/x86_64-portbld-freebsd/directory-ospath-streaming-0.3-36314961506d372e9056f2aede13bfdfe30e9a034e346dbbc2d22b033cf11864/build/System/Directory/OsPath/Utils.o )
Error: [Cabal-7125]
Failed to build host:directory-ospath-streaming-0.3-36314961506d372e9056f2aede13bfdfe30e9a034e346dbbc2d22b033cf11864 (which is required by exe:ghcup from host:ghcup-0.2.6.0-ghcup). See the build log above for details.

As the title says, setting shared: True makes it compile, but why is this setting required now? That seems wrong.

[andreabedini]

Give me the whole invocation and I can try to reproduce.
Nevermind, I got it going. I'll let you know if it works.