#12347: Parallel make should eagerly report when compilation of a module starts -------------------------------------+------------------------------------- Reporter: ezyang | Owner: Type: bug | Status: new Priority: low | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Steps to reproduce: 1. Create a small project which has some parallelism, but the individual files take some time to compile. For my testing, I used the module from https://ghc.haskell.org/trac/ghc/ticket/9630#comment:22 and set things up so that I had: {{{ -- A.hs -- contents of #9630 test-case -- B.hs -- contents of #9630 test-case -- C.hs -- contents of #9630 test-case -- All.hs module All where import A import B import C }}} 2. Run `ghc --make All A B C -j4 +RTS -N4` Expected results: GHC immediately reports that it is building `A`, `B`, and `C`; some time later `All` begins compiling. Actual results: Only one module is reported at first; only after it completes are the rest reported (quickly!) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12347 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler