#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): Here's how this could look with locks instead of a buildserver. The semantics of the lock file is that if you ran the action to build `Foo.hi` and you can take the lock on `Foo.o-lock`, then `Foo.o` is ready. {{{ Foo.hi : Bar.hi Baz.hi ( flock Foo.o-lock ghc -c Foo.hs -finterface-file-finished=1,0,x & ) \ | read -n 1 Foo.o : Foo.hi flock Foo.o-lock true }}} Ideally we'd also propagate the exit status of `ghc` to the rule for `Foo.o`, and clean up the lock files. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13152#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler