Stack traces in ghci

[Simon Marlow]

Hi Dominic - this looks like a problem with loading hmatrix into GHCi.
Does it load without -prof and -fexternal-interpreter?  How about with just
-fexternal-interpreter?

Cheers
SImon

On 5 December 2016 at 12:20, Dominic Steinitz <dominic at steinitz.org> wrote:

> I am trying to debug a package in which there is a divide by 0 error and
> attempting to use Simon Marlow’s stack traces: https://simonmar.github.io/
> posts/2016-02-12-Stack-traces-in-GHCi.html. However ghci is complaining
> about  missing symbols. What do I need to add to the command line to coax
> ghci into giving me a stack trace?
>
> > ~/Dropbox/Private/Stochastic/demo $ ghci -fexternal-interpreter -prof
> fe-handling-example.o -i../../monad-bayes/src  -package-db=.cabal-sandbox/
> x86_64-osx-ghc-8.0.1-packages.conf.d
> > GHCi, version 8.0.1: http://www.haskell.org/ghc/  :? for help
> > Prelude> :l app/Main.hs
> > [ 1 of 16] Compiling Control.Monad.Bayes.LogDomain (
> ../../monad-bayes/src/Control/Monad/Bayes/LogDomain.hs, interpreted )
> > [ 2 of 16] Compiling Control.Monad.Bayes.Primitive (
> ../../monad-bayes/src/Control/Monad/Bayes/Primitive.hs, interpreted )
> > [ 3 of 16] Compiling Control.Monad.Bayes.Class (
> ../../monad-bayes/src/Control/Monad/Bayes/Class.hs, interpreted )
> > [ 4 of 16] Compiling Control.Monad.Bayes.Sampler (
> ../../monad-bayes/src/Control/Monad/Bayes/Sampler.hs, interpreted )
> > [ 5 of 16] Compiling Control.Monad.Bayes.Sequential (
> ../../monad-bayes/src/Control/Monad/Bayes/Sequential.hs, interpreted )
> > [ 6 of 16] Compiling Control.Monad.Bayes.Prior (
> ../../monad-bayes/src/Control/Monad/Bayes/Prior.hs, interpreted )
> > [ 7 of 16] Compiling Control.Monad.Bayes.Rejection (
> ../../monad-bayes/src/Control/Monad/Bayes/Rejection.hs, interpreted )
> > [ 8 of 16] Compiling Control.Monad.Bayes.Weighted (
> ../../monad-bayes/src/Control/Monad/Bayes/Weighted.hs, interpreted )
> > [ 9 of 16] Compiling Control.Monad.Bayes.Population (
> ../../monad-bayes/src/Control/Monad/Bayes/Population.hs, interpreted )
> > [10 of 16] Compiling Control.Monad.Bayes.Deterministic (
> ../../monad-bayes/src/Control/Monad/Bayes/Deterministic.hs, interpreted )
> > [11 of 16] Compiling Control.Monad.Bayes.Conditional (
> ../../monad-bayes/src/Control/Monad/Bayes/Conditional.hs, interpreted )
> > [12 of 16] Compiling Control.Monad.Bayes.Dist (
> ../../monad-bayes/src/Control/Monad/Bayes/Dist.hs, interpreted )
> > [13 of 16] Compiling Control.Monad.Bayes.Coprimitive (
> ../../monad-bayes/src/Control/Monad/Bayes/Coprimitive.hs, interpreted )
> > [14 of 16] Compiling Control.Monad.Bayes.Trace (
> ../../monad-bayes/src/Control/Monad/Bayes/Trace.hs, interpreted )
> > [15 of 16] Compiling Control.Monad.Bayes.Inference (
> ../../monad-bayes/src/Control/Monad/Bayes/Inference.hs, interpreted )
> > [16 of 16] Compiling Main             ( app/Main.hs, interpreted )
> >
> > app/Main.hs:92:7: warning: [-Wunused-matches]
> >     Defined but not used: ‘a’
> >
> > app/Main.hs:92:9: warning: [-Wunused-matches]
> >     Defined but not used: ‘prevP’
> >
> > app/Main.hs:92:15: warning: [-Wunused-matches]
> >     Defined but not used: ‘prevZ’
> >
> > app/Main.hs:106:5: warning: [-Wunused-do-bind]
> >     A do-notation statement discarded a result of type ‘GHC.Prim.Any’
> >     Suppress this warning by saying
> >       ‘_ <- ($)
> >               error (++) "You are here " (++) show state (++) " " show
> p_obs’
> > Ok, modules loaded: Main, Control.Monad.Bayes.LogDomain,
> Control.Monad.Bayes.Primitive, Control.Monad.Bayes.Class,
> Control.Monad.Bayes.Population, Control.Monad.Bayes.Conditional,
> Control.Monad.Bayes.Inference, Control.Monad.Bayes.Sampler,
> Control.Monad.Bayes.Rejection, Control.Monad.Bayes.Weighted,
> Control.Monad.Bayes.Sequential, Control.Monad.Bayes.Trace,
> Control.Monad.Bayes.Dist, Control.Monad.Bayes.Prior, Control.Monad.Bayes.Deterministic,
> Control.Monad.Bayes.Coprimitive.
> > *Main> main
> > ghc-iserv-prof:
> > lookupSymbol failed in relocateSection (relocate external)
> > /Users/dom/Dropbox/Private/Stochastic/demo/.cabal-
> sandbox/lib/x86_64-osx-ghc-8.0.1/hmatrix-0.18.0.0-7aYEqJARQEvKYNyM4UGAPZ/
> libHShmatrix-0.18.0.0-7aYEqJARQEvKYNyM4UGAPZ_p.a: unknown symbol
> `___ieee_divdc3'
> > ghc-iserv-prof: Could not on-demand load symbol '_vectorScan'
> >
> > ghc-iserv-prof:
> > lookupSymbol failed in relocateSection (relocate external)
> > /Users/dom/Dropbox/Private/Stochastic/demo/.cabal-
> sandbox/lib/x86_64-osx-ghc-8.0.1/hmatrix-0.18.0.0-7aYEqJARQEvKYNyM4UGAPZ/
> libHShmatrix-0.18.0.0-7aYEqJARQEvKYNyM4UGAPZ_p.a: unknown symbol
> `_vectorScan'
> > ghc-iserv-prof: Could not on-demand load symbol '_
> hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziVectorizzed_
> constantAux_closure'
> >
> > ghc-iserv-prof:
> > lookupSymbol failed in relocateSection (relocate external)
> > /Users/dom/Dropbox/Private/Stochastic/demo/.cabal-
> sandbox/lib/x86_64-osx-ghc-8.0.1/hmatrix-0.18.0.0-7aYEqJARQEvKYNyM4UGAPZ/
> libHShmatrix-0.18.0.0-7aYEqJARQEvKYNyM4UGAPZ_p.a: unknown symbol `_
> hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziVectorizzed_
> constantAux_closure'
> > ghc-iserv-prof: Could not on-demand load symbol '_
> hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziMatrix_Matrix_con_
> info'
> >
> > ghc-iserv-prof:
> > lookupSymbol failed in relocateSection (relocate external)
> > /Users/dom/Dropbox/Private/Stochastic/demo/.cabal-
> sandbox/lib/x86_64-osx-ghc-8.0.1/hmatrix-0.18.0.0-7aYEqJARQEvKYNyM4UGAPZ/
> libHShmatrix-0.18.0.0-7aYEqJARQEvKYNyM4UGAPZ_p.a: unknown symbol `_
> hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziMatrix_Matrix_con_
> info'
> > ghc-iserv-prof: Could not on-demand load symbol '_
> hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziElement_zgzl_info'
> >
> > ghc-iserv-prof:
> > lookupSymbol failed in relocateSection (relocate external)
> > /Users/dom/Dropbox/Private/Stochastic/demo/.cabal-
> sandbox/lib/x86_64-osx-ghc-8.0.1/hmatrix-0.18.0.0-7aYEqJARQEvKYNyM4UGAPZ/
> libHShmatrix-0.18.0.0-7aYEqJARQEvKYNyM4UGAPZ_p.a: unknown symbol `_
> hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziElement_zgzl_info'
> > ghc-iserv-prof: Could not on-demand load symbol '_
> hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziUtil_
> zdfIndexableVectorDouble_closure'
> >
> >
> > ByteCodeLink.lookupCE
> > During interactive linking, GHCi couldn't find the following symbol:
> >   hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziUtil_
> zdfIndexableVectorDouble_closure
> > This may be due to you not asking GHCi to load extra object files,
> > archives or DLLs needed by your current session.  Restart GHCi,
> specifying
> > the missing library using the -L/path/to/object/dir and -lmissinglibname
> > flags, or simply by naming the relevant files on the GHCi command line.
> > Alternatively, this link failure might indicate a bug in GHCi.
> > If you suspect the latter, please send a bug report to:
> >   glasgow-haskell-bugs at haskell.org
>
>
>
> Dominic Steinitz
> dominic at steinitz.org
> http://idontgetoutmuch.wordpress.com
>
> _______________________________________________
> Glasgow-haskell-users mailing list
> Glasgow-haskell-users at haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users
>
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