Americo Barbosa da Cunha Junior wrote:
I've trying to link a Fortran code to a C++ code.
First I create the object files for both languages:
g77 -c ckinterp.f math.f xerror.f cklib.f vode.f conp.f
g++ -c linear_alg.cpp teste.cpp
Than I use the g++ to link:
g++ -o jac *.o -lg2c -lm
The GCC returns a message like:
cklib.o: In function `ckcomp_':cklib.f:(.text+0x2b43): multiple
definition of `ckcomp_'
ckinterp.o:ckinterp.f:(.text+0xa9b3): first defined here
cklib.o: In function `ifirch_':cklib.f:(.text+0x17d58): multiple
definition of `ifirch_'
ckinterp.o:ckinterp.f:(.text+0xa8aa): first defined here
/usr/bin/ld: Warning: size of symbol `ifirch_' changed from 139 in
ckinterp.o to 164 in cklib.o
cklib.o: In function `ilasch_':cklib.f:(.text+0x17dfc): multiple
definition of `ilasch_'
ckinterp.o:ckinterp.f:(.text+0xa935): first defined here
/usr/bin/ld: Warning: size of symbol `ilasch_' changed from 126 in
ckinterp.o to 156 in cklib.o
cklib.o: In function `ipplen_':cklib.f:(.text+0x18654): multiple
definition of `ipplen_'
ckinterp.o:ckinterp.f:(.text+0xb1c7): first defined here
cklib.o: In function `ipparr_':cklib.f:(.text+0x1827b): multiple
definition of `ipparr_'
ckinterp.o:ckinterp.f:(.text+0xa491): first defined here
/usr/bin/ld: Warning: size of symbol `ipparr_' changed from 1049 in
ckinterp.o to 985 in cklib.o
cklib.o: In function `ippari_':cklib.f:(.text+0x17e98): multiple
definition of `ippari_'
ckinterp.o:ckinterp.f:(.text+0xa0ae): first defined here
conp.o: In function `MAIN__':conp.f:(.text+0x0): multiple definition of
`MAIN__'
ckinterp.o:ckinterp.f:(.text+0x0): first defined here
/usr/bin/ld: Warning: size of symbol `MAIN__' changed from 11317 in
ckinterp.o to 3528 in conp.o
xerror.o: In function `xerrwv_':xerror.f:(.text+0xfc0): multiple
definition of `xerrwv_'
vode.o:vode.f:(.text+0x7484): first defined here
/usr/bin/ld: Warning: size of symbol `xerrwv_' changed from 457 in
vode.o to 593 in xerror.o
/usr/bin/ld: cannot find -lg2c
collect2: ld returned 1 exit status
If you do have multiple versions of the same subroutine (and Fortran
MAIN) in your source code, you'll have to figure out which don't belong,
and exclude them.
As you have 2 versions of Fortran main program, it's difficult to
understand why you would use g++ to link. Why not choose a Fortran,
preferably an up to date gfortran, to run the whole show? Something like
gfortran *.f *.cpp -lstdc++ (having selected the proper *.f)
