undefined reference to 'SolveBIE_' when binding C++ and Fortran

问题

My Fortran code needs to call C++ function named SolveBIE_(), and this function is written in one file, e.g. test.c. SolveBIE_() needs to call some other C++ functions written in other files, e.g. part01.c, part02.c. I also claim those functions in part01.h and part02.h. Then I use

 $ gcc -c part01.c
 $ gcc -c part02.c
 $ ar cr kf.a part01.o part02.o  part01.h part02.h

to get my kf.a. I link the kf.a as a object file in my fortran compiling. I am using intel fortran ifort and a makefile. I got an error in my make. Here is the makefile script.

FC =  ifort
IFC_OPT = -O3 -ipo -unroll
FFLAGS = -extend_source -mp1 -xW -w95 -cm $(IFC_OPT) -cm
LINKFLAGS = -LFFTPACK  -ldfftpack 
CC = cc
HS_OBJECTS = xx.o kf.a ...\ objectfile
VEL  = vel_new_massflux.o matvec.o 
MAIN = xx.o new_restart.o
hsflux_objs = $(MAIN) $(VEL) $(HS_OBJECTS)
hsflux: $(hsflux_objs)
$(FC) -o hsflux $(FFLAGS) $(hsflux_objs) $(LINKFLAGS)

hsfluxd_objs = driver_massflux_debug.o $(VEL) $(HS_OBJECTS)
hsflux_debug: $(hsfluxd_objs)
$(FC) -o hsflux_debug $(FFLAGS) $(hsfluxd_objs) $(LINKFLAGS)

$(FC) $(FFLAGS) -o testfft2 testfft2.o FAST.o xfft.o $(LINKFLAGS)

  .f.o:
$(FC) -c $(FFLAGS) $*.f

   .c.o:
$(CC) -c $*.c

   clean:
/bin/rm -f *.o *~

   VISCFING_FILES=Makefile *.f *.F *.c *.h  FFTPACK Scripts PARAMS

The error is

  ipo: warning #11021: unresolved SolverBIE_
      Referenced in  /tmp/ipo_ifortUqyTSb.o
 /tmp/ipo_ifortUqyTSb.o: In function 'MAIN_':
 ipo_out.f:(.text+0x5442): undefined reference to 'SolveBIE_'

The detail of the C++ code and Fortran code is here, another question I asked, it seems that problem is solved. But I need to complete the compiling to make sure. C++ code and fortran code

回答1:

Going back to your linked code, the Fortran has

  integer (C_INT) function SolveBIE_(x, y, aa, m) BIND(C, NAME='SolveBIE_')

Whereas the C has

  int solveBIE_(double *ini_bdry_x, double *ini_bdry_y, double *ini_bdry_um, int *fM)

The Fortran part is thus looking for a symbol called SolveBIE_ while the C part is providing a symbol called solveBIE_. The difference in case of every character matters!

来源：https://stackoverflow.com/questions/48696645/undefined-reference-to-solvebie-when-binding-c-and-fortran

标签

c++

intel-fortran