access functions from another c file

Hello, I have this problem. I have to create my own malloc file. I have made a header<.H file> that holds the function names of all my functions. I am calling this malloc from another file.

I cannot compile that malloc file alone, because malloc requires data such sizeof etc....

But when I am compiling my program (other than malloc). I get this error.

Code:

Undefined                       first referenced
 symbol                             in file
my_malloc                           /var/tmp//ccKI1S6Y.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status

What would be the way around this?

In your .c file that defines malloc(), include all of the necessary header files, such as stdio.h or whatever else you need.

In your .c file that uses your own malloc(), include the header files that you need, as well as your .h file for your malloc() (and any that your .h file depends upon).

Compile them both together, or compile separately (but don't try to link them separately).