#13152: Provide a mechanism to notify build system when .hi file is ready -------------------------------------+------------------------------------- Reporter: rwbarton | Owner: Type: feature request | Status: new Priority: normal | Milestone: 8.2.1 Component: Driver | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by rwbarton): Hmm, I'm not familiar with Buck at all, but could you have an encoding with two commands per module, a command-to-build-`.hi` and a command-to- build-`.o`? In reality the command-to-build-`.hi` exits when ghc reports that it is done writing the `.hi` file but leaves ghc running in the background to finish building the `.o` file, and the command-to-build-`.o` just blocks until that finishes. The command-to-build-`.hi` only depends on other command-to-build-`.hi`s. That's how my `make` encoding really works anyways. Probably in a more sophisticated system you could express the idea of a command that produces two resources at different times directly. In fact, now that I look at my `make` example again, it seems one wouldn't even need a server to do the blocking; probably advisory file locks are enough. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13152#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler