Dynamic Library

[Montenegro, Alejandro]

HI,
I was wondering if it is possible to generate dynamic libraries using GNU.
I have a program that uses different functions from FORTRAN and from C ( see the content of makefile below), and I would like not to have to recompile and build  it everytime I change one of the files ( in this particular case the file called SPIRITI.o).

Is there any way I can create an executable and still be able to access "modified" functions without having to rebuild the entire project?

Thanks

Almonleo

************************************* makefile *********************************************
CC=gcc
FOR="">
OBJECTS =dimdef.o \
        newmods.o \
        comtac.o \
        fgnmod.o \
        usernl.o \
        analyt.o \
        devt69.o \
        usrfun.o \
        hopcod.o \
        user10.o \
        SPIRIT.o \
CFLAGS =  -DUNDERSCORE -O2
FFLAGS = -O2
IMAGE=tpbig.exe
LIBRARY = tpbig.a dislin.a -luser32 -lgdi32 -lcomdlg32
.f.o:
        $(FOR) -c $(FFLAGS) $<
.c.o:
        $(CC) -c $(CFLAGS) $(INCFLAGS) $<
$(IMAGE) : $(OBJECTS)
        $(FOR) -s -o $(IMAGE) $(OBJECTS) $(LIBRARY)
********************************************************************************************************