#9903: GHCi produces a cryptic message when using HPC -------------------------------------+------------------------------------- Reporter: | Owner: facundo.dominguez | Status: new Type: bug | Milestone: Priority: normal | Version: 7.9 Component: GHCi | Keywords: hpc Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: GHCi crash | Related Tickets: #9878, #9762 ? Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Description changed by facundo.dominguez: Old description:

The following test produces an impolite response from GHCi

{{{ $ cat t.hs g :: Int g = 1 + 1 $ ghc-stage2 --interactive t.hs -fhpc GHCi, version 7.9.20141217: http://www.haskell.org/ghc/ :? for help [1 of 1] Compiling Main ( t.hs, interpreted ) Ok, modules loaded: Main. *Main> g ghc-stage2: panic! (the 'impossible' happened) (GHC version 7.9.20141217 for x86_64-unknown-linux): Loading temp shared object failed: /tmp/ghc25774_0/ghc25774_5.so: undefined symbol: _hpc_tickboxes_Main_hpc

Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} It has been noted elsewhere (#9878) that these kinds of messages are better avoided.

New description: The following test produces an impolite response from GHCi {{{ $ cat t.hs g :: Int g = 1 + 1 $ ghc-stage2 --interactive t.hs -fhpc GHCi, version 7.9.20141217: http://www.haskell.org/ghc/ :? for help [1 of 1] Compiling Main ( t.hs, interpreted ) Ok, modules loaded: Main. *Main> g ghc-stage2: panic! (the 'impossible' happened) (GHC version 7.9.20141217 for x86_64-unknown-linux): Loading temp shared object failed: /tmp/ghc25774_0/ghc25774_5.so: undefined symbol: _hpc_tickboxes_Main_hpc Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} Discovered while investigating #9878. -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9903#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#9903: GHCi produces a cryptic message when using HPC -------------------------------------+------------------------------------- Reporter: | Owner: facundo.dominguez | Status: new Type: bug | Milestone: Priority: normal | Version: 7.9 Component: GHCi | Keywords: hpc Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: GHCi crash | Related Tickets: #9878, #9762 ? Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by rwbarton): Replying to [comment:2 rwbarton]:

This is likely the same issue as #9762, yes.

After some investigation I no longer think it's the same issue. This one is really about supporting HPC in bytecode objects. In the short term we may just want to bail out of the bytecode compiler if HPC is turned on (with a friendlier message) and suggest that the user use `-fobject-code`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9903#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#9903: GHCi produces a cryptic message when using HPC -------------------------------------+------------------------------------- Reporter: | Owner: facundo.dominguez | Type: bug | Status: closed Priority: normal | Milestone: Component: GHCi | Version: 7.9 Resolution: invalid | Keywords: hpc Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: GHCi crash | Test Case: Blocked By: | Blocking: Related Tickets: #9878, #9762 ? | Differential Revisions: -------------------------------------+------------------------------------- Comment (by Ben Gamari ): In [changeset:"d2dd5af433be80464883735f133f3e4dea9c8bd4/ghc" d2dd5af/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="d2dd5af433be80464883735f133f3e4dea9c8bd4" DynFlags: Prohibit hpc and byte-code interpreter The user's guide says hpc is incompatible with GHCi and #9903 would agree. Fixes #9903. }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9903#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler