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Asked: 2026-05-22T02:17:13+00:00

I am working on some code that mixes OCaml and C, the functions caml_release_runtime_system()

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I am working on some code that mixes OCaml and C, the functions caml_release_runtime_system() and caml_acquire_runtime_system() were introduced in OCaml 3.12 (they were called something else in earlier versions) but I would like to be compatible back to 3.10 if possible, is there an #ifdef I can use for that? I have had a look through the headers (in /usr/lib/ocaml/caml on my Debian system) and can’t find anything that looks like it might. Thanks!

UPDATE: this is what I did

This is what I did:

#if OCAML_VERSION_MINOR >= 12
#include <caml/threads.h>
#else
#include <caml/signals.h>
#endif 

#ifndef caml_acquire_runtime_system
#define caml_acquire_runtime_system caml_leave_blocking_section
#define caml_release_runtime_system caml_enter_blocking_section
#endif
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1 Answer

  1. Editorial Team

    The ocamlopt and ocamlc binaries supports -vnum and -version switches for getting the version number:

    -vnum or -version
    Print the version number of the compiler in short form (e.g. 3.11.0), then exit.

    This switch is supported in 3.12.0 and the example text in the documentation suggests that 3.11.0 also supports it. I don’t have 3.10.0 handy but nlucaroni (whose OCaml Fu looks stronger than mine) indicates in the comments that 3.10.0 does have ocamplopt -version.

    So you could add something like this to your Makefile:

    OCAML_VERSION_MAJOR = `ocamlopt -version | cut -f1 -d.`
OCAML_VERSION_MINOR = `ocamlopt -version | cut -f2 -d.`
OCAML_VERSION_POINT = `ocamlopt -version | cut -f3 -d.`

    And then pass those to your compiler using -DOCAML_VERSION_MAJOR=$(OCAML_VERSION_MAJOR), -DOCAML_VERSION_MINOR=$(OCAML_VERSION_MINOR), …

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