#10458: GHCi fails to load shared object (the 'impossible' happened) -----------------------------------------+--------------------------------- Reporter: rleslie | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 7.10.1 Keywords: | Operating System: Linux Architecture: x86_64 (amd64) | Type of failure: None/Unknown Test Case: | Blocked By: Blocking: | Related Tickets: Differential Revisions: | -----------------------------------------+--------------------------------- I have a project that uses two external libraries, namely `-lcrypt` and `-lpcre`. Building with `cabal` and running the resulting executable works as expected, but I'm having trouble starting a REPL in GHCi: {{{ % cabal repl Preprocessing executable 'etamoo' for EtaMOO-0.2.1.0... GHCi, version 7.10.1: http://www.haskell.org/ghc/ :? for help /usr/bin/ld: dist/build/etamoo/etamoo-tmp/src/cbits/crypt.o: relocation R_X86_64_PC32 against undefined symbol `crypt' can not be used when making a shared object; recompile with -fPIC /usr/bin/ld: final link failed: Bad value collect2: error: ld returned 1 exit status }}} The error suggests I need `-fPIC`, and this seems to help the `-lcrypt` case, but now I get: {{{ % cabal repl --ghc-options="-fPIC" Preprocessing executable 'etamoo' for EtaMOO-0.2.1.0... GHCi, version 7.10.1: http://www.haskell.org/ghc/ :? for help ghc: panic! (the 'impossible' happened) (GHC version 7.10.1 for x86_64-unknown-linux): Loading temp shared object failed: /tmp/ghc21539_0/libghc21539_2.so: undefined symbol: pcre_callout Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} FYI the C type of `pcre_callout` is a little unusual: {{{ extern int (*pcre_callout)(pcre_callout_block *); }}} In other words it is a global variable (pointer to function), not a function itself. Any advice is welcome, including the proper way to start GHCi given these external dependencies, as well as on this apparent bug. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10458 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler