Compiling multiple C files in a program

Question

I have the following two files:

file1.c

int main(){
  foo();
  return 0;
}

file2.c

Answer 1

It's ugly, but using gcc, you could:

gcc -include file2.c file1.c

-include is a flag to the preprocessor which will include the contents of file2.c at the very top of file1.c. Having said that, it's a poor choice, and breaks down for all but the simplest of programs.