Dear devs I have thirty or so builds of GHC on my disk. Sometimes I want to use one build to build and install (for that build alone) a bunch of libraries. If I do cabal install hspec -w $HOME/code/HEAD-22/_build/stage1/bin/ghc then Cabal rightly warns me
Warning: The libraries were installed by creating a global GHC environment file at: /home/simonpj/.ghc/x86_64-linux-9.15.20260309/environments/default The presence of such an environment file is likely to confuse or break other tools because it changes GHC's behaviour: it changes the default package set in ghc and ghci from its normal value (which is "all boot libraries"). GHC environment files are little-used and often not tested for. Question: how can I install the libraries in the build tree for $HOME/code/HEAD-22? After all, I think ghc-internal, base etc are all in that build-tree. Surely hspec can be too? But how? Thanks! Simon
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