Add support for using GHC's -jsem option #9139
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* 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.
Kleidukos
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Thank you, let's fast-track this |
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@Mergifyio backport 3.10 |
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* Add alex to build-tool-depends and remove separate code gen - Pass latin-1 encoding is passed as input pragma - Cabal hard-codes -g for alex so we don't need to worry about --ghc - Rework bootstrap, adding per-component building - Update bootstrap plans * [bootstrap] warn the user if cabal config is not found * [bootstrap] regenerate bootstrap plans once more * [bootstrap] regenerate bootstrap files after #9139
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This is a rebase and fixup of #8557.
The top-level user interface to enable the use of the semaphore is the
--semaphoreflag. If you pass-j4 --semaphorethen cabal will create a semaphore with 4 slots which is passed to ghc using the-jsemoption so that all GHC processes coordinate to use 4 capabilities.semaphore-compatwhich provides a cross-platform abstraction for semaphores.The low level
./Setup.hs buildinterface accepts the--semaphore <SEMAPHORE>option, which can be used to directly pass the semaphore you require to the Setup script.