Commits on Jul 18, 2023

1. Add support for using GHC's -jsem option …

   * The top-level user interface to enable the use of the semaphore is the
     `--semaphore` flag. If you pass `-j4 --semaphore` then cabal will
     create a semaphore with 4 slots which is passed to ghc using the
     `-jsem` option so that all GHC processes coordinate to use 4
     capabilities.
   
     - The semaphore logic is provided by a new package `semaphore-compat`
       which provides a cross-platform abstraction for semaphores.
   
   * The low level `./Setup.hs build` interface accepts the `--semaphore
     <SEMAPHORE>` option, which can be used to directly pass the semaphore
     you require to the Setup script.

   

   mpickering authored and bgamari committed Jul 18, 2023
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