Use a non-default build dir when building add-source deps. #1312
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Fixes #1281.
I decided against using
.cabal-sandbox/dist/$PKGID
since we can have several add-source deps with a single$PKGID
. Although that can probably be fixed by deleting the build dir when adding an add-source dep with an already-existing package id, there is another complication - when doinginstall --only-dependencies
, there is no way to distinguish add-source deps (for which we want to cache the build dir under.cabal-sandbox
) from regular ones (for which we likely don't).