GCC gfortran does not output basic debug info

I exclusively use GCC gfortran in my daily activities. I was just wondering why it does not give out useful information on C code when creating intertwined libraries with Fortran using C to do some brute force activities.

Now if I create a file called “test_this.c” and simply import the .c file into the the test_this file, and run gcc on it, I will get that information.

I was simply wondering this because it’s the GNU Compiler Collection and it seems like it’s not working together with itself? Maybe this was intentionally behavior. I was just curious.