[cfe-dev] Build-bot host compiler upgrades and C++11!

Nico Weber thakis at chromium.org
Tue Jan 7 17:09:30 PST 2014

On Tue, Jan 7, 2014 at 1:44 AM, Chandler Carruth <chandlerc at gmail.com>wrote:

> Greetings, I'm trying CC-ing all the folks I could think of that are
> likely running bots for Clang. If I've missed any, sorry, please add them.
> As you may have heard on various lists, it's time to switch Clang (and
> LLVM) to use C++11. The first step is establishing a new baseline of
> compiler versions that are supported[1]:
> MSVC 2012
> GCC 4.7

Does this mean clang with require libstdc++4.7 too? Or can gcc 4.7 target
libstdc++ 4.6 somehow?

> Clang 3.1

Is libc++ going to be a requirement on OS X (i.e. clang 3.5+ won't run on
OS X versions older than 10.7), or will using the newest libstdc++
available on OS X (4.2) be ok too?

> If you are helping to keep our build bot infrastructure running and
> up-to-date, please check the host compiler versions and reply here if
> you're going to have trouble upgrading. My rough plan based on chatting
> with some folks is to submit checks to cmake and configure on Monday to
> produce an error on older toolchains without some flag to force old
> toolchain support.
> So reply to this thread if you need more time, or if all your bots are
> ready-to-go! Thanks a bunch!
> -Chandler
> [1]: Most of these compilers were available in the middle (June) of 2012,
> and based on the planned 3.5 release time frame of the middle of 2014, that
> will mean a roughly two year spread of compiler releases. MSVC 2012 was
> later, but the community seems comfortable with requiring the upgrade.
> Also, these versions include very significant improvements that make
> adopting C++11 features much more viable. This was discussed at some length
> on the mailing list previously, and I'm not really trying to re-open debate
> here, just reminding folks. =]
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
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