My project is split through multiple subprojects, which are connected through cabal sandbox add-source. When I build "main" project via cabal build -j, cabal uses multiple cores, while if I do cabal install --only-dependencies -j, it would only use single core for each dependency.
This is very inconvenient, and it would be best for sources added with cabal sandbox add-source to also use multiple cores for each package.
Is this possible? Is it implemented, or is there a ticket for this already? I couldn't find anything about this.
You can pass -j to ghc. For example: cabal install --ghc-options='-j4'
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