Cannot build with Hadrian

[Eric Crockett]

GHC newcomer here -- attempting to work on my first patch.

I decided to try Hadrian, but ran into a problem.

I think I obtained the source using
> git clone --recursive https://gitlab.haskell.org/ghc/ghc
Then:
> ./boot && ./configure
> hadrian/build.sh -j --flavour=devel2

This ran for maybe 15 minutes, then showed the error below. Apparently I
ended up with too many tarballs? Any suggestions?

Thanks,
Eric

...

 ...

| Run Ghc CompileCWithGhc Stage1: rts/Inlines.c =>
> _build/stage1/rts/build/c/Inlines.thr_o
> | Run Cc FindCDependencies Stage1: rts/Compact.cmm =>
> _build/stage1/rts/build/cmm/Compact.o.d
> | Run Cc FindCDependencies Stage1: rts/PathUtils.c =>
> _build/stage1/rts/build/c/PathUtils.o.d
> | Run Ghc CompileHs Stage1: rts/Compact.cmm =>
> _build/stage1/rts/build/cmm/Compact.o
> | Run Ghc CompileCWithGhc Stage1: rts/PathUtils.c =>
> _build/stage1/rts/build/c/PathUtils.o
> | Remove file _build/stage1/rts/build/libHSrts-1.0.a
> | Run Ar Pack Stage1: _build/stage1/rts/build/c/Adjustor.o (and 113 more)
> => _build/stage1/rts/build/libHSrts-1.0.a
> /usr/bin/ar: creating _build/stage1/rts/build/libHSrts-1.0.a
> /---------------------------------------------------\
> | Successfully built library 'rts' (Stage1, way v). |
> | Library: _build/stage1/rts/build/libHSrts-1.0.a   |
> \---------------------------------------------------/
> | Remove file _build/stage1/rts/build/libHSrts-1.0_thr.a
> | Run Ar Pack Stage1: _build/stage1/rts/build/c/Adjustor.thr_o (and 115
> more) => _build/stage1/rts/build/libHSrts-1.0_thr.a
> /usr/bin/ar: creating _build/stage1/rts/build/libHSrts-1.0_thr.a
> /-----------------------------------------------------\
> | Successfully built library 'rts' (Stage1, way thr). |
> | Library: _build/stage1/rts/build/libHSrts-1.0_thr.a |
> \-----------------------------------------------------/
> | Copy file: _build/generated/ghcplatform.h =>
> _build/stage1/rts/build/ghcplatform.h
> | Copy file: _build/generated/ghcversion.h =>
> _build/stage1/rts/build/ghcversion.h
> | Copy file: _build/generated/DerivedConstants.h =>
> _build/stage1/rts/build/DerivedConstants.h
> | Copy file: _build/generated/ghcautoconf.h =>
> _build/stage1/rts/build/ghcautoconf.h
> | Remove directory _build/stage1/libffi/build
> shakeArgsWith    0.000s    0%
> Function shake   0.005s    0%
> Database read    0.000s    0%
> With database    0.000s    0%
> Running rules  548.377s   99%  =========================
> Total          548.383s  100%
> Error when running Shake build system:
>   at src/Rules.hs:(35,19)-(52,17):
>   at src/Rules.hs:52:5-17:
> * Depends on: _build/stage1/lib/package.conf.d/rts-1.0.conf
>   at src/Rules/Register.hs:(94,9)-(98,34):
> * Depends on: _build/stage1/rts/build/ffi.h
>   at src/Rules/Libffi.hs:(49,7)-(52,48):
> * Depends on: _build/stage1/rts/build/ffi.h
> _build/stage1/rts/build/ffitarget.h
>   at src/Rules/Libffi.hs:52:13-48:
> * Depends on: _build/stage1/libffi/build/inst/lib/libffi.a
>   at src/Hadrian/Builder.hs:70:5-23:
> * Depends on: _build/stage1/libffi/build/Makefile
>   at src/Rules/Libffi.hs:107:9-27:
> * Depends on: _build/stage1/libffi/build/Makefile.in
> * Raised the exception:
> Exactly one LibFFI tarball is expected
> CallStack (from HasCallStack):
>   error, called at src/Hadrian/Utilities.hs:60:27 in main:Hadrian.Utilities
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