Question on gcc compiler commands

Question

I had to compile a small little C program using the following;

gcc sine.c -o sine -lm

I needed the "-lm" because the program included the math.h.

In looking this up under compiler commands man shows it a either -llibrary or -l library.

I could not find any information on what other libraries. Apparently -lm is needed for math.h what other library commands might be needed.

Thanks

Answer 1

-lm means to link the "m" library, which as you said contains math stuff. If you need other libraries for your code, your documentation for those functions will show that.

Answer 2

If it links without errors, you don't need anything anything else. In fact you don't even need to specify -lm, as it and the standard C library are linked automatically.