How to Link Fortran and C Binaries Without Missing Library Dependencies?

Linking Fortran and C Binaries: Resolving Library Mismatches

When developing projects that involve both C and Fortran code, it becomes necessary to link the resulting binaries together to create a cohesive program. However, attempting to compile such projects using either g or gfortran alone can lead to errors due to missing library dependencies.

To resolve these issues, it is essential to use the appropriate linking flag that specifies the required library for the other language.

Solution for Linking C and Fortran Binaries

When linking a project involving C and Fortran, follow these steps:

• Use g to compile the C source code: g -c main.cpp -o main.o
• Use gfortran to compile the Fortran source code: gfortran -c print_hi.f90 -o print_hi.o
• Link the compiled object files using g : g main.o print_hi.o -o main -lgfortran

This command will include the necessary Fortran libraries (-lgfortran) when linking, thereby resolving the undefined reference errors encountered with g alone.

Alternative Approach

If you prefer to use gfortran for linking, you can achieve the same result by passing the -lstdc flag:

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

This flag will incorporate the required C libraries (-lstdc ) during linking, addressing the undefined references faced when using gfortran exclusively.

By utilizing the appropriate linking flags, you can successfully combine C and Fortran binaries into a fully functional program.

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