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

[Eric Christopher]

On Fri, Nov 8, 2013 at 8:49 AM, <dag at cray.com> wrote:

> Chandler Carruth <chandlerc at google.com> writes:
>
> > The overwhelming majority of contributors and users of trunk seem to
> > be fine with this, so while I'm interested in anything we can do to
> > make it easier for you, unless we see significantly more concerns
> > about this plan, I think we should move forward.
> >
> > Fundamentally, we aren't going to be able to make everyone happy. Some
> > people will be seriously inconvenienced by this, but thus far the
> > benefit seems to significantly outweigh the cost.
>
> But the benefit is still there even if it takes a month or two longer.
>
> This is a *serious* issue.  It doesn't seem like people really
> comprehend the challenges of upgrading toolchains in large software
> projects.  We're talking about millions and millions of lines of code
> spread out over many independent modules.  These all have to fit
> together to create a usable tool.
>
> What is so hard about waiting an extra month to give people a chance to
> test the new toolchain?
>

You could start now with compiling under C++11 mode. The autoconf and (I
think) cmake ability is there now. That should get you your extra month -
especially if you count when we started this discussion.

-eric



>
> > That said, while I'm about to commit the change to the release notes
> > and send a summary email to the dev lists, we should continue
> > discussing this. Nothing is going to be set in stone until the 3.4
> > release goes out, and maybe not even then. Especially if you or others
> > want to discuss this with me in person (or others in person) at the
> > dev meeting, I'm writing this email from the hacking session. =] Happy
> > to chat.
>
> I'm not going to be at the dev meeting.
>
>                          -David
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