How to Link C and Fortran Binaries with GCC?

Linking C and Fortran Binaries via GCC

Connecting C and C or C and Fortran code is straightforward using gcc and its g and gfortran derivatives. However, linking C and Fortran procedures can become problematic.

The Problem

Compiling C and Fortran source code separately yields object files when using g and gfortran, but linking them results in errors due to missing libraries. Neither compiler recognizes the libraries required by the other.

The Solution

To link binaries that combine C and Fortran, you need to explicitly include the necessary libraries. For g , use the -lgfortran flag to add the standard Fortran libraries:

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

Alternatively, gfortran can be utilized with the -lstdc flag:

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

This action ensures that the linker includes the relevant libraries, allowing the C and Fortran code to interact seamlessly.

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