RFC: JEP JDK-8208089: Implement C++14 Language Features

[Volker Simonis]

Andrew Haley <aph at redhat.com> schrieb am Mo., 2. März 2020, 13:00:

> On 11/19/18 8:39 PM, Kim Barrett wrote:
> > I don't see any benefit to making the first C++ code change that uses
> > a new feature also incorporate the needed build system changes.
> > Indeed, how does one develop that feature usage unless one has the
> > build system changes already in hand?
> >
> > It seems to me that if the documentation says one can use some new
> > language feature but the build system hasn't been updated to actually
> > support doing so, then the documentation is wrong. And recall that
> > this JEP includes making some new features available immediately.
> > (That initial list might be modified as part of this JEP discussion.)
>
> What is the status of this? I thought we'd decide, but I still see
>
>    $1_CXXSTD_CXXFLAG="-std=gnu++98"
>
> in flags-cflags.m4
>
> I need std::make_unsigned in order to fix some undefined behaviour in
> HotSpot. I could implement it myself in share/metaprogramming but if
> we've agreed to allow C++14, can we please get it done now? Thx.
>

As lead of the 8 and 11 update projects you probably know best, if this fix
will eventually be considered for backporting and choose your means wisely
:)


> --
> Andrew Haley  (he/him)
> Java Platform Lead Engineer
> Red Hat UK Ltd. <https://www.redhat.com>
> https://keybase.io/andrewhaley
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>
>