Re: Windows build warnings

> On 22 Nov 2021, at 16:40, Tom Lane <tgl@sss.pgh.pa.us> wrote:

> I can't find anything that is providing a non-empty definition of
> PG_USED_FOR_ASSERTS_ONLY (a/k/a pg_attribute_unused) for anything
> except GCC. 

It's supported in clang as well per the documentation [0] in at least some
configurations or distributions:

        "The [[maybe_unused]] (or __attribute__((unused))) attribute can be
        used to silence such diagnostics when the entity cannot be removed.
        For instance, a local variable may exist solely for use in an assert()
        statement, which makes the local variable unused when NDEBUG is
        defined."