More failure

[Ben Gamari]

Simon Peyton Jones via ghc-devs <ghc-devs at haskell.org> writes:

> More pain.  I said
> sh validate --fast --no-clean
> and got this output
>
> Error when running Shake build system:
>
>   at action, called at src/Rules.hs:71:19 in main:Rules
>
>   at need, called at src/Rules.hs:93:5 in main:Rules
>
> * Depends on: _validatebuild/stage1/lib/package.conf.d/base-4.14.0.0.conf
>
>   at need, called at src/Rules/Register.hs:113:5 in main:Rules.Register
>
> * Depends on: _validatebuild/stage1/libraries/base/build/libHSbase-4.14.0.0-ghc8.11.0.20191201.so
>
>   at need, called at src/Rules/Library.hs:146:5 in main:Rules.Library
>
> * Depends on: _validatebuild/stage1/libraries/base/build/GHC/IO/Handle/Lock/Common.dyn_o
>
>   at &%>, called at src/Rules/Compile.hs:54:7 in main:Rules.Compile
>
> * Depends on: _validatebuild/stage1/libraries/base/build/GHC/IO/Handle/Lock/Common.dyn_o _validatebuild/stage1/libraries/base/build/GHC/IO/Handle/Lock/Common.dyn_hi
>
>   at error, called at src/Development/Shake/Internal/Rules/Files.hs:245:13 in shake-0.18.3-593067565aafb558d09b4352b8abc327d8911a39a0e9abab2804b002b1ae536e:Development.Shake.Internal.Rules.Files
>
> * Raised the exception:
>
> Error, &%> rule failed to produce 1 file (out of 2)
>
>   _validatebuild/stage1/libraries/base/build/GHC/IO/Handle/Lock/Common.dyn_o
>
>   _validatebuild/stage1/libraries/base/build/GHC/IO/Handle/Lock/Common.dyn_hi - MISSING

I suspect that this is due to a previously-failed build and #17534.
The workaround is to remove the traces of the half-finished build:

    rm _validatebuild/stage1/libraries/base/build/GHC/IO/Handle/Lock/Common.*

and rerun the build; this may require multiple iterations.

Cheers,

- Ben
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