--- Begin Message ---
I don't mind checking it in any different way. Alas, I don't know any. Maybe
someone else does - since this is a mailing list, hundreds of smart people can
see this question. Don't be shy, everyone ;)
However, I am still not sure you are checking the version in the right way.
Because what you posted looks like you redefine the macro somewhere in your
code. As I said, this does NOT work. The C++ version is ultimately decided by
the compiler. The __cplusplus macro just informs you about what the compiler
uses. Redefining it in the code is nonsensical and does not do what you think
it does. If you really want to convince me, don't redefine it anywhere, just
print it. If it outputs anything less than C++20 and still compiles fine even
with any C++20 features, I will be seriously flabbergasted, but will accept
this as an opportunity to increase my knowledge.
----- Original Message -----
From: "Ross Finlayson" <finlay...@live555.com>
To: "LIVE555 Streaming Media, development & use" <live-de...@us.live555.com>
Sent: Friday, August 25, 2023 9:23:26 PM
Subject: Re: [Live-devel] Building with C++ version less than 20
> On Aug 25, 2023, at 2:42 AM, Jörg Dommaschk via live-devel
> <live-de...@us.live555.com> wrote:
>
>
> How do you define __cplusplus on your systems, though? Because as you can see
> here:
> https://en.cppreference.com/w/cpp/atomic/atomic_flag
> this test method really only exists since C++20.
Nonetheless, on the two systems that I tested (FreeBSD and Mac OS X),
__cplusplus is defined as follows (respectively):
<built-in>:377:21: note: expanded from here
#define __cplusplus 201402L
and
<built-in>:393:21: note: expanded from macro '__cplusplus'
#define __cplusplus 199711L
There might be a way to accurately check whether the “test()” member function
is defined for "std::atomic_flag”, but checking "__cplusplus >= 202002L” is
definitely not the right way to do so. Sorry.
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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