GHC issueshttps://gitlab.haskell.org/ghc/ghc/-/issues2019-07-09T09:40:40Zhttps://gitlab.haskell.org/ghc/ghc/-/issues/16800Hadrian: Symlink Breaks Cached Builds2019-07-09T09:40:40ZDavid EichmannHadrian: Symlink Breaks Cached Builds# Recreation
```bash
$ ./hadrian/build.sh --share=_cache -j --flavour=quickest
...
Error when running Shake build system:
at action, called at src/Rules.hs:68:19 in main:Rules
at need, called at src/Rules.hs:90:5 in main:Rules
* Dep...# Recreation
```bash
$ ./hadrian/build.sh --share=_cache -j --flavour=quickest
...
Error when running Shake build system:
at action, called at src/Rules.hs:68:19 in main:Rules
at need, called at src/Rules.hs:90:5 in main:Rules
* Depends on: _build/stage1/lib/package.conf.d/rts-1.0.conf
at need, called at src/Rules/Register.hs:101:5 in main:Rules.Register
* Depends on: _build/stage1/rts/build/libCffi_thr.a
* Raised the exception:
_cache/.shake.cache/5029bef81b20dfbd/0xF03C561F: getPermissions:getFileStatus: does not exist (No such file or directory)
$ ls -l _cache/.shake.cache/5029bef81b20dfbd/0xF03C561F
lrwxrwxrwx 2 david david 9 Jun 11 16:54 _cache/.shake.cache/5029bef81b20dfbd/0xF03C561F -> libCffi.a
```
`_cache/.shake.cache/5029bef81b20dfbd/0xF03C561F` is a broken link, but is "correct" in the sense that we want to copy the symlink as is so that `_build/stage1/rts/build/libCffi_thr.a` is a symlink to `_build/stage1/rts/build/libCffi.a`. This seems like a bug in Shake: it manages to correctly copy the symlink into the cache, but fails on the way back out.⊥David EichmannDavid Eichmann