Shared Libraries in ghci

Bernd Brassel bbr at
Fri Feb 8 03:55:57 EST 2008

Sorry to ask a C question here, but I could not find an answer on the net.

How do I create a library that can be used in ghci?

This is the situation:
I have a c file coracle.c. I do

/tmp$ cc -c -o coracle.o coracle.c
/tmp$ ar rc libcoracle.a coracle.o
/tmp$ ranlib libcoracle.a

and then I the library is linked statically with ghc just fine:

/tmp$ ghc -L/tmp -lcoracle --make COracle.hs

But if I create a shared library, like this:

/tmp$ cc -c -shared -o coracle.c

then ghci does not like the format:

/tmp$ ghci -L/tmp -lcoracle COracle.hs
GHCi, version 6.8.2:  :? for help
Loading package base ... linking ... done.
Loading object (dynamic) coracle ... failed.
Dynamic linker error message was:
   /tmp/ only ET_DYN and ET_EXEC can be loaded
Whilst trying to load:  (dynamic) coracle
Directories to search are:
ghc-6.8.2: user specified .o/.so/.DLL could not be loaded.

In the web I only find bla about which bit in the ELF-header of the
library tells you that it is ET_DYN or not. But never how to build such
a library.

I guess it is too much to hope for a C-freak around here but I am sure a
semi-freak or quarter-freak will do as well.

Thanks in advance!

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