🚀 go-pugleaf

On Tuesday 16 April 2002 00:40, Tansu Senyurt wrote:
> We used prolog engine one of our Projects and now we want to compile the
> project as library so we can use it with other applications.
> The problem is that, we can compile the whole program in to the library
> but when we try to compile a program that uses this library
> we get some errors like: (for examples i already compiled the project as
> libgain.so)
>
>   .//libgain.so: undefined reference to `PL_initialise'
> .//libgain.so: undefined reference to `PL_close_foreign_frame'
> .//libgain.so: undefined reference to `PL_put_term'
> .//libgain.so: undefined reference to `PL_copy_term_ref'
> .//libgain.so: undefined reference to `PL_cut_query'
> .//libgain.so: undefined reference to `PL_new_term_refs'
> .//libgain.so: undefined reference to `PL_chars_to_term'
>
> to be more precise:
>
> We used C++ for the project implementation and SWI-cpp.h is included to
> the project. There are several sorce files in the project and one of the
> classes uses the prolog engine. We initialize the prolog endine in the
> main function (main function's name is changed to "gain()" for compiling
> as library). I used
>
> g++ -c *.cc
> ar rlv libgain.a *.o
> ranlib libgain.a
>
> Until this point everything seems OK.
>
> I wrote a test cpp file in order to test the library. It's something
> like that:
>
> void gain();
> int main(){
> 	gain();
> }
> I named this file test.cpp then i tried to compile the file using the
> libgain.a
>
> g++ test.cc -L./ -lgain
>
> then i got the errors listed above. The project is compiled on Linux i686
> g++ version 2.95.3
> pl version 4.0.11

At least the platform is clear now :-)  Not clear however is what you do to
Prolog.  From what I see, it looks like you simply don't include it anywhere
in your project.  I guess thats not true!?

Normally, if you have libgain.a and some main program you should be able to
do

	plld -o test test.cc -L. -lgain

Add -v to see what is going on.  Basically it will add -L/dir/to/prolog/lib
-lpl and whatever libraries are needed on the hosting system to build Prolog.

	--- Jan



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