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module GHC.UniqueSubdir
( uniqueSubdir
) where
import Prelude -- See Note [Why do we import Prelude here?]
import Data.List (intercalate)
import GHC.Platform
import GHC.Version (cProjectVersion)
-- | A filepath like @x86_64-linux-7.6.3@ with the platform string to use when
-- constructing platform-version-dependent files that need to co-exist.
--
-- 'ghc-pkg' falls back on the host platform if the settings file is missing,
-- and so needs this since we don't have information about the host platform in
-- as much detail as 'Platform', so we use 'PlatformMini' instead.
uniqueSubdir :: PlatformMini -> FilePath
uniqueSubdir archOs = intercalate "-"
[ stringEncodeArch $ platformMini_arch archOs
, stringEncodeOS $ platformMini_os archOs
, cProjectVersion
]
-- NB: This functionality is reimplemented in Cabal, so if you
-- change it, be sure to update Cabal.
-- TODO make Cabal use this now that it is in ghc-boot.
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