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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
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  • #15838
Closed
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Issue created Oct 30, 2018 by Yuras@trac-Yuras

Warn about unused dependencies

GHC loads packages lazily, so at the end of compilation (at least in --make mode) it knows all the dependencies, required to compile the code. See eps_PIT in ExternalPackageState. If we compare this list with the list of packages, passed on command like via --package-id, then we'll get a list of unused dependencies.

I propose to add a flag -Wunused-packages, off by default, which will report the unused packages if any.

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Version 8.6.1
Type FeatureRequest
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
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