#3333: GHCi doesn't load weak symbols
---------------------------+------------------------------------------------
Reporter: heatsink | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 6.14.1
Component: GHCi | Version: 6.10.4
Resolution: | Keywords: weak, dynamic loading
Difficulty: Unknown | Os: Linux
Testcase: | Architecture: x86
Failure: None/Unknown |
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Changes (by guest):
* cc: [email protected] (added)
* failure: => None/Unknown
* version: 6.10.3 => 6.10.4
Comment:
I encountered the same problem with LLVM recently. LLVM is also a C++
library with C interface. I did the following hack, without knowing what
I'm really doing. I needed to build shared object files of the LLVM
libraries anyway, in order to use them in GHCi. Then I built a big .so
file containing all libraries (.a) and object files (.o) of LLVM. There
the symbols seems to have been resolved.
{{{
# get many small object (.o) files out of the libraries (.a)
for src in /usr/lib/llvm/*.a; do ar -x $src ; done
# assemble those object files and the other ones of LLVM project to a big
shared object file (.so)
gcc -shared -Wl,-soname,libLLVM.so.2.5 -o libLLVM.so.2.5
/usr/lib/llvm/LLVM*.o *.o
# provide the file with default name
ln -s libLLVM.so.2.5 libLLVM.so
# remove interim object files
rm *.o
}}}
I also had to replace the linker options -lLLVMSupport -lLLVMCore and so
on by -lLLVM (the monolithic so-file) in the fields extraLibraries and
ldOptions ~/.ghc/i386-linux-6.10.4/package.conf for the Haskell package
'llvm'.
I have no idea whether this hack would work for other libraries.
Btw. If you want to use LLVM in GHCi you may also have to respect the
linker script problem described in #2615 and remove the pthread dependency
in package.conf, too.
With all those steps I could use LLVM in GHCi, but after a :reload,
running an LLVM function causes GHCi to quit with:
{{{
ghci: JITEmitter.cpp:110: <unnamed>::JITResolver::JITResolver(llvm::JIT&):
Assertion `TheJITResolver == 0 && "Multiple JIT resolvers?"' failed.
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3333#comment:3>
GHC <http://www.haskell.org/ghc/>
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