On Friday, June 21, 2013 9:44:04 PM UTC-7, c b wrote:
>
>
> I got a libpyledger.so, but upon doing an import libpyledger in python, I
> get the following error
>
> ImportError: ./libpyledger.so: undefined symbol: __gmpq_add
>
> Any ideas about this? I have absolutely no idea about this since I'm not a
> C++ programmer.
>
> Thanks,
> cb
>
> That's a promising development. I'm surprised that simply changing the
name in the BOOST_PYTHON_MODULE macro had this effect.
__gmpq_add is one of the functions from the GMP library (one of ledger's
dependencies), so it looks like this library did not get linked into
libpyledger.so. Unfortunately, that's actually a CMake issue, not a C++
issue, and CMake is almost a complete mystery to me. Nevertheless, I'll
risk saying something ignorant in the hopes it might help you along.
In the top-level CMakeLists.txt, it defines a macro named
add_ledger_library_dependencies, and you can see it adding MPFR_LIB and
GMP_LIB dependencies to the passed-in target. This macro is used in
src/CMakeLists.txt to set "ledger" as the target that these dependencies
are added to.
So, I think you need to use similar directives to add the same dependencies
to your python module library. In src/CMakeLists.txt, after you use
add_library to create a pyledger library, I think you should try
target_link_libraries(pyledger, ${MPFR_LIB}
target_link_libraries(pyledger, ${GMP_LIB}
Tim Crews
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