Building the stubs generate warnings

[AllanBlanchard]

I downloaded the last artifacts, running the build command, I get the following error:

$ dune build @install
In file included from switch/lib/ocaml/caml/io.h:28,
                 from mlmpfr_stubs.h:323,
                 from mlmpfr_stubs.c:17:
switch/lib/ocaml/caml/platform.h: In function ‘caml_plat_latch_is_released’:
switch/lib/ocaml/caml/platform.h:222:10: warning: implicit declaration of function ‘atomic_load_acquire’ [-Wimplicit-function-declaration]
  222 |   return atomic_load_acquire(&latch->value) == Latch_released;
      |          ^~~~~~~~~~~~~~~~~~~
switch/lib/ocaml/caml/platform.h: In function ‘caml_plat_latch_set’:
switch/lib/ocaml/caml/platform.h:230:3: warning: implicit declaration of function ‘atomic_store_release’; did you mean ‘atomic_store_explicit’? [-Wimplicit-function-declaration]
  230 |   atomic_store_release(&latch->value, Latch_unreleased);
      |   ^~~~~~~~~~~~~~~~~~~~
      |   atomic_store_explicit

The opam file suggests that there are additional steps to perform before running the dune command, but I could not figure out what I should do.

[AllanBlanchard]

Ok, this is not a problem with the build instructions, just additional warnings.

[thvnx]

Hi, thanks for the report, I'll have a look!

[thvnx]

What C compiler are you using (I do not reproduce on my side with clang 16)?

[AllanBlanchard]

I have two configurations.

Ubuntu:

• gcc 11.4
• dune 3.17.2
• ocaml 5.3

Nix:

• gcc 14.2
• dune 3.17.1
• ocaml 5.3

I made a few additional tests with Nix, apparently, this only happens with OCaml 5.3.