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

André Jansen Medeiros Villar via llvm-dev llvm-dev at lists.llvm.org
Fri Nov 10 17:07:21 PST 2017

Given that no policy existed before the adoption of it should include a
grace period. So it should read:

* Starting with clang 7 we can bump the minimum required non-Microsoft
toolchain version every 4 years.

2017-11-01 14:24 GMT-02:00 Zachary Turner via llvm-dev <
llvm-dev at lists.llvm.org>:

> On Tue, Oct 31, 2017 at 11:23 PM Zachary Turner <zturner at google.com>
> wrote:
>> I’m ok with that, but the reason I’m pushing is because there is no clear
>> plan of action. Even if the plan of action is “When X happens, we can
>> enable C++14”, that’s fine too. I just want to know, concretely, what is X.
>> We should either be able to say never or give a reasonable set of
>> conditions that would enable a switch. All I’ve seen though is “it’s hard”
>> which just means I’m going to ask again next year, and the year after, etc
>> due to lack of clear guidance.
>> To address your point though , this isn’t really about building
>> everything with clang. You don’t need to bootstrap Clang to build a
>> hypothetical C++17 enabled LLVM, you could also bootstrap a more modern
>> version of GCC.
>> This is really more fundamentally about “Can we have a clearly defined
>> policy about how often we can bump the minimum compiler version, like we
>> have for MSVC?”
> To make this even more concrete, let me offer a proposal:
> * We can bump the minimum required non-Microsoft toolchain version every 4
> years.
> Having something written like this allows us to have a schedule, and
> having a schedule allows downstream consumers to plan upgrades as needed so
> as to minimize disruption.
> 4 years is also a pretty reasonable amount of time IMO, but we can
> certainly discuss the exact value of N.
> I haven't said anything here about what it can be bumped *to*.  But in the
> interest of making progress, I'm separating the decisions out into smaller
> pieces so we can focus on one thing at a time.
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