Re: Problems with linking C-libraries

[Jose Maria Peña]

Dietmar wrote:

Hi,

I was a similar problem few week ago. I founded two ways to
solve the problem. For both solutions first you should generate
the object for each of the parts.
.pl files ---> .o (via gplc -c)
.c files ---> .o (via gcc -c)

In order to generate the executable you can use gplc to link
all the object files:
gplc *.o -o my_file                /* You can also add some liker
options */

The second option uses gcc or ld to make the linkage directly.
But you need to add specific prolog libraries and some object
files from the gprolog distributions. You need to provide them
to the linker in a specific order. My Makefile has the following
sentences:
OBJS= ......o                 #   The object file of your project.
PL_OBJ_DIR=....      # GProlog Library directory
BEGIN_EXTRA_OBJS=$(PL_OBJ_DIR)/obj_begin.o
END_EXTRA_OBJS=\
        $(PL_OBJ_DIR)/all_pl_bips.o  \
        $(PL_OBJ_DIR)/libbips_pl.a   \
        $(PL_OBJ_DIR)/obj_end.o      \
        $(PL_OBJ_DIR)/libengine_pl.a \
        $(PL_OBJ_DIR)/liblinedit.a
...............
my_file: $(OBJS)
    gcc $(BEGIN_EXTRA_OBJS) $(OBJS) $(END_EXTRA_OBJS) $(LIBRARIES) -o
my_file

You may need to add or remove some _EXTRA_OBJS depending
whether you use some or other options (e.g FD support).
This second option is more or less what gplc does when linking.

Personaly, I'd rather use the first one (it is easy) and only if
you need very special options and you have to to manipulate the
linker directly use the second one.

Cheers,
    Chema


> Hello,
> I got problems, when I tried to compile Prolog-Source-files with
> C-files, because I used certain C-libraries, that couldn't be found
> by gplc. I used the '-L'-Option to pass the library-pathes to the
> linker, but I always got an 'undefined reference' - error.
> I couldn't find any further information in the manual.
> Does anybody know, how I can tell gplc to use certain libraries
> to link, in order to get a native executable?
>
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