Linker error when adding a new source file

[Alp Mestanogullari]

Right, Hadrian knows which modules to compile and link by looking at the 
.cabal files -- so when you omit a module from the .cabal file Hadrian 
will fail to build the corresponding library or executable correctly.

On 23/08/2019 18:20, Jan van Brügge wrote:
>
> 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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>>
>>
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-- 
Alp Mestanogullari, Haskell Consultant
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