How to Link Fortran and C Binaries Together Using GCC?

Linking Fortran and C Binaries with GCC

To connect C and Fortran code using gcc, certain steps must be followed.

Suppose you have the following code:

// print_hi.f90
subroutine print_hi() bind(C)
  implicit none
  write(*,*) "Hello from Fortran."
end subroutine print_hi

// main.cpp
#include <iostream>
extern "C" void print_hi(void);
using namespace std;
int main() {
  print_hi();
  cout << "Hello from C++" << endl;
  return 0;
}

After compiling the individual object files using

gfortran -c print_hi.f90 -o print_hi.o
g++ -c main.cpp -o main.o

To link these binaries together, you need to include the appropriate libraries. When using g , you should add the Fortran library using:

g++ main.o print_hi.o -o main -lgfortran

This includes the necessary library for Fortran functions.

Alternatively, if you're using gfortran, you can include the C library:

gfortran main.o print_hi.o -o main -lstdc++

Including these libraries ensures proper resolution of symbols and allows smooth execution of the linked binary.

The above is the detailed content of How to Link Fortran and C Binaries Together Using GCC?. For more information, please follow other related articles on the PHP Chinese website!