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From: "Randy Brukardt" <randy@rrsoftware.com>
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Subject: Re: Ann: GWindows release, 29-May-2023
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"Gautier write-only address" <gautier_niouzes@hotmail.com> wrote in message 
news:9a893d03-ccf9-46cb-b7f0-1e46263cf8b0n@googlegroups.com...
> Something thougher is a couple of intrinsic imports (sync_add_and_fetch, 
> sync_sub_and_fetch):
>   function sync_add_and_fetch
>     (Ref : access Interfaces.Unsigned_32;
 >     Add : Interfaces.Unsigned_32)
 >     return Interfaces.Unsigned_32
 >    with
  >     Import,
 >      Convention => Intrinsic,
 >      External_Name => "__sync_add_and_fetch_4";
>
>which seems to be specific to GCC (and actually, not even all versions of 
>GCC...)

This looks like an atomic operation. A portable Ada definition of such 
operations is found in C.6.1-C.6.4 of Ada 2022. Probably those could be used 
to replace the operation (of course, that would limit one to compilers 
supporting that part of Ada 2022; dunno if anyone is doing that yet).

                        Randy.