Compiling Multiple Files

Turning multi-file C source into an executable happens in two stages: compiling and linking.

Each .c file is compiled separately into an object file. Then the linker combines all object files, resolving references between them, into one runnable program.

The simplest approach hands every source file to gcc at once. The compiler builds each, then links them automatically.

The -o flag names the output program. List all .c files; headers are pulled in via #include and are not listed here.