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 mailto:jan@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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I recently experienced this when rebasing. Have you tried a clean build? `rm -rf _build` was enough for me, IIRC. Am Fr., 23. Aug. 2019 um 17:08 Uhr schrieb Brandon Allbery < allbery.b@gmail.com>:

From the looks of it, you're building with a bootstrap compiler (stage 0). Does the build compiler need to have this in its runtime libraries for the built compiler to work? This will require you to work it in in multiple versions, the first providing it without using it and the next using the provided one.

On Fri, Aug 23, 2019 at 12:03 PM Jan van Brügge 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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