#14469: Rebuilding profiled stage2 after building stage3 is broken -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Build System | Version: 8.2.1 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: -------------------------------------+------------------------------------- The following appears to break, {{{ $ cat <<EOF >mk/build.mk BuildFlavour = prof ifneq "$(BuildFlavour)" "" include mk/flavours/$(BuildFlavour).mk endif EOF $ make stage=2 $ make stage=3 $ touch compiler/stage2/build/Simplify.* $ make stage=2 ... ghc/GHCi/UI/Info.hs:43:1: error: Could not find module ‘TcHsSyn’ Perhaps you haven't installed the profiling libraries for package ‘ghc-8.3’? Locations searched: ghc/./TcHsSyn.p_hi ghc/./TcHsSyn.p_hi-boot ghc/stage2/build/TcHsSyn.p_hi ghc/stage2/build/TcHsSyn.p_hi-boot ghc/stage2/build/ghc/autogen/TcHsSyn.p_hi ghc/stage2/build/ghc/autogen/TcHsSyn.p_hi-boot /mnt/work/ghc/ghc/compiler/stage3/build/TcHsSyn.p_hi | 43 | import TcHsSyn | ^^^^^^^^^^^^^^^^^^^^^^^^ }}} The problem appears to be that the build system registers the stage3 `ghc`, which we didn't build in the profiled way, overwriting the stage2 registration. Hopefully Hadrian will do better here. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14469 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler