Linker error when adding a new source file

[Jan van Brügge]

Thanks Sandy, it seems like that did the job

Am 23.08.19 um 18:04 schrieb Sandy Maguire:
> Sometimes I see this if I forget to add a file to the
> `exposed-modules` field of the cabal file. You might be running into that?
>
> On Fri, Aug 23, 2019 at 10:03 AM Jan van Brügge <jan at vanbruegge.de
> <mailto:jan at vanbruegge.de>> wrote:
>
>     Hi,
>
>     in order to clean up my code, I've moved a bunch of stuff to a new
>     source file, `TcRowTys.hs` that works similar to `TcTypeNats.hs`. But
>     when trying to compile a clean build of GHC, I get a linker error:
>
>     ```
>
>     | Run Ghc LinkHs Stage0: _build/stage0/ghc/build/c/hschooks.o (and 1
>     more) => _build/stage0/bin/ghc
>     _build/stage0/lib/../lib/x86_64-linux-ghc-8.6.5/ghc-8.9.0.20190722/libHSghc-8.9.0.20190722.a(PrelInfo.o)(.text+0x2814):
>     error: undefined reference to 'ghc_TcRowTys_rowTyCons_closure'
>     _build/stage0/lib/../lib/x86_64-linux-ghc-8.6.5/ghc-8.9.0.20190722/libHSghc-8.9.0.20190722.a(PrelInfo.o)(.data+0x578):
>     error: undefined reference to 'ghc_TcRowTys_rowTyCons_closure'
>     _build/stage0/lib/../lib/x86_64-linux-ghc-8.6.5/ghc-8.9.0.20190722/libHSghc-8.9.0.20190722.a(TcHsType.o)(.data+0xdd8):
>     error: undefined reference to 'ghc_TcRowTys_rnilTyCon_closure'
>     collect2: Fehler: ld gab 1 als Ende-Status zurück
>     `gcc' failed in phase `Linker'. (Exit code: 1)
>
>     ```
>
>     I had a look at the Wiki including the FAQ, but did not fine anything
>     about that topic. Does someone know what I have to do for this to
>     work?
>
>     Cheers,
>     Jan
>
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