[llvm-dev] Using C++14 code in LLVM

Mon Oct 3 09:11:03 PDT 2016

Oh it's "documented" - great.. well that doesn't give any weight to if
it works and how robust. Is there tests for these features or not? I
know if I wanted to add or change *anything* a test would be required.

On Mon, Oct 3, 2016 at 10:11 PM, Zachary Turner <zturner at google.com> wrote:
> It's documented here
>
> http://clang.llvm.org/cxx_status.html
>
> On Mon, Oct 3, 2016 at 4:00 AM C Bergström <cbergstrom at pathscale.com> wrote:
>>
>> I see a lot of people talking about c++14 and *maybe* clang-N.N.N will
>> support it, but is there any tests which can be used to
>> actually/tangibly verify this?
>>
>> Is there tests for the features being proposed to take advantage of?
>> It would be prudent to ensure there's tests available to verify on
>> buildbots before any decision to switch is made.
>>
>> Break this into steps and it becomes a plan instead of just tossing
>> opinions around.
>>
>> From what I read so far - I'd speculate that only old Linux and NetBSD
>> will have an issue with the bump. Worst case those platforms need an
>> extra step to bootstrap, but should that hold everything back? Either
>> newer clang is good enough to replace the older version or it's not.
>> However, testing as a pre-cursor and getting facts is important.
>>
>> #1 Tests for the features
>> #2 Bug tracker to identify any regressions blocking updating
>> #3 Buildbots to verify
>>
>> On Mon, Oct 3, 2016 at 6:49 PM, Dimitry Andric via llvm-dev
>> <llvm-dev at lists.llvm.org> wrote:
>> > I wasn't able to find that information on the distrowatch page you
>> > linked, but I will assume that it is talking about the available ports, e.g.
>> > packages external to the FreeBSD base system.  In the FreeBSD ports
>> > collection, we have clang 3.3 through 3.9 available, and a 4.0 trunk
>> > snapshot as of 2016-08-24.
>> >
>> > On the other hand, the base system is a little different, in the sense
>> > that we use clang to bootstrap the whole system, and use the FreeBSD build
>> > system instead of llvm/clang's native build system.  Also, we don't have all
>> > the additional tools like llc, opt, and so on, by default.
>> >
>> > FreeBSD 10.3 currently has clang 3.4.1, with libc++ from around that
>> > time, plus a bunch of patches.  I think it will be able to do most of C++14,
>> > except maybe some corner cases.
>> >
>> > FreeBSD 11.0 (which is going to ship any day now) has clang 3.8.0, with
>> > libc++ 3.8.0.
>> >
>> > I'm currently working on importing clang 3.9.0 into FreeBSD 12 (the
>> > development version) together with libc++ 3.9.0, compiler-rt 3.9.0 and so
>> > on.  These will hopefully land before the end of this month.  After about a
>> > month, I will merge it all into FreeBSD 11, so it will end up in FreeBSD
>> > 11.1.
>> >
>> > -Dimitry
>> >
>> >> On 03 Oct 2016, at 05:43, Zachary Turner via llvm-dev
>> >> <llvm-dev at lists.llvm.org> wrote:
>> >>
>> >> For anyone still on gcc 4.2.1, then I think this entire discussion is
>> >> kind of irrelevant, because they are already having to build a new toolchain
>> >> to compile LLVM, since the minimum is currently 4.7.  So for those people, I
>> >> would imagine 4.7 vs. 4.9 makes no difference?
>> >>
>> >> Maybe I'm misunderstanding the table of the distrowatch page, but if
>> >> FreeBSD 11 has clang 3.8 as you say, why does distrowatch say FreeBSD 10 and
>> >> 11 have clang 3.9?
>> >>
>> >> On Sun, Oct 2, 2016 at 7:10 PM Krzysztof Parzyszek via llvm-dev
>> >> <llvm-dev at lists.llvm.org> wrote:
>> >> On 10/2/2016 6:09 PM, Zachary Turner via llvm-dev wrote:
>> >> > The BSDs don't seem as much of an issue.  FreeBSD 10 and 11 both have
>> >> > LLVM 3.9 and GCC 4.9.  NetBSD 6.1.5 and 7.0 both have GCC 5.3 and
>> >> > LLVM
>> >> > 3.8.  Open BSD has a very old GCC, but distrowatch claims that it
>> >> > also
>> >> > has LLVM 3.8.
>> >>
>> >> FreeBSD 11 has clang 3.8.0.  There is gcc in the /usr/src/contrib, but
>> >> that's 4.2.1.  There are still platforms that FreeBSD supports that
>> >> have
>> >> not finished moving to clang (from gcc 4.2.1).
>> >>
>> >> -Krzysztof
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