#12111: prof build flavour doesn't work -------------------------------------+------------------------------------- Reporter: osa1 | Owner: Type: bug | Status: infoneeded Priority: normal | Milestone: Component: Build System | Version: 8.0.1 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 thomie): This commit message is informative (ce1f1607ed7f8fedd2f63c8610cafefd59baaf32): {{{ Author: Simon Marlow Date: Sat Nov 7 09:39:05 2015 +0000 Make GHCi & TH work when the compiler is built with -prof Summary: Amazingly, there were zero changes to the byte code generator and very few changes to the interpreter - mainly because we've used good abstractions that hide the differences between profiling and non-profiling. So that bit was pleasantly straightforward, but there were a pile of other wibbles to get the whole test suite through. Note that a compiler built with -prof is now like one built with -dynamic, in that to use TH you have to build the code the same way. For dynamic, we automatically enable -dynamic-too when TH is required, but we don't have anything equivalent for profiling, so you have to explicitly use -prof when building code that uses TH with a profiled compiler. For this reason Cabal won't work with TH. We don't expect to ship a profiled compiler, so I think that's OK. Test Plan: validate with GhcProfiled=YES in validate.mk Reviewers: goldfire, bgamari, rwbarton, austin, hvr, erikd, ezyang Reviewed By: ezyang Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1407 GHC Trac Issues: #4837, #545 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12111#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#12111: prof build flavour doesn't work -------------------------------------+------------------------------------- Reporter: osa1 | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Build System | Version: 8.0.1 Resolution: invalid | 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 thomie): Actually, you do need to fiddle with `-fprof-auto` a little. See this comment in `compiler/ghc.mk`: {{{ # If we're profiling GHC then we want SCCs. However, adding -auto-all # everywhere tends to give a hard-to-read profile, and adds lots of # overhead. A better approach is to proceed top-down; identify the # parts of the compiler of interest, and then add further cost centres # as necessary. Turn on -fprof-auto for individual modules like this: # compiler/main/DriverPipeline_HC_OPTS += -fprof-auto compiler/main/GhcMake_HC_OPTS += -fprof-auto compiler/main/GHC_HC_OPTS += -fprof-auto # or alternatively add {-# OPTIONS_GHC -fprof-auto #-} to the top of # modules you're interested in. }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12111#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler