[LLVMdev] [cfe-dev] RFC: A proposal to move toward using C++11 features in LLVM & Clang / bounding support for old host compilers

[Chandler Carruth]

On Sun, Oct 27, 2013 at 4:07 PM, Renato Golin <renato.golin at linaro.org>wrote:

> On 27 October 2013 15:53, Chris Lattner <clattner at apple.com> wrote:
>
>> I'm not sure what you mean.  Are your proposing that clang 3.4 use any
>> features supported by clang 3.3?  If so, that won't work, because clang
>> can't self-host on all interesting architectures, e.g. it isn't fully ABI
>> compatible with Visual C++ (yet).
>>
>
> No, not yet. Certainly not for 3.4!
>
> My comment was more to the effect that we could use this as a target for
> the future (and probably never achieve it), thus why "design guideline" and
> not a developer policy.
>
> We'll have to make sure we can do it on all "interesting" architectures
> first (given all constraints).
>

I think that just establishing a floor on the problem (a soft one, which
naturally has to be interpreted based on the realities at the time) is the
best first step. I *don't* want to lose the ability to host LLVM and Clang
with reasonably modern C++ toolchains that are not Clang-derived. I *do*
want to set expectations with clear guidelines for what we consider
"reasonably modern" to be.
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