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@haskell.org
Dominic Steinitz dominic@steinitz.org http://idontgetoutmuch.wordpress.com