How to stop main wrapping when tangling C in org-babel?

Question

Please consider the following self-contained, minimal example org file:

#+name: zepto-c
#+CAPTION: A tiny C file
#+begin_src C++ :tangle zepto.c
#include "zepto.h"
void foo (void) {}
#+end_src

#+name: zepto-h
#+CAPTION: A tiny header file
#+begin_src C++ :tangle zepto.h
#include <stdio.h>
void foo (void);
#+end_src

On org-babel-tangle, it produces the expected two files, zepto.c and zepto.h, but they contain wrappers with main:

zepto.c:

int main() {
#include "zepto.h"
void foo (void) {}
return 0;
}

zepto.h:

int main() {
#include <stdio.h>
void foo (void);
return 0;
}

I just want org-babel to tangle out exactly what I wrote, with no modifications. I have tried many combinations of headers :eval, :results, :exports, :tangle, and :noweb from the documentation, even trying verbatim values for them in the hopes that some undocumented feature will give me the results I want, but no luck. The space of all possibile values for those headers is combinatorially large, so it could take me a long time to try them all. Perhaps someone knows the correct incantation?

I will be grateful for any advice.

Answer 1

There is a :main header argument defined in ob-C. :main no avoids the wrapping.