[llvm-dev] Upgrading to MSVC 2015

Robinson, Paul via llvm-dev llvm-dev at lists.llvm.org
Fri Jul 29 13:23:54 PDT 2016

There are certainly enough people making commits that work with VS2015 but not VS2013 that the "would it be useful" question is pretty well answered.  I've already brought up the idea on my team, as it's obviously coming and we need time to coordinate with internal consumers of the toolchain.

From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of Zachary Turner via llvm-dev
Sent: Friday, July 29, 2016 11:35 AM
To: Piotr Padlewski; Aaron Ballman
Cc: llvm-dev
Subject: Re: [llvm-dev] Upgrading to MSVC 2015

Probably not.  It's very confusing because they are transitioning to a new versioning scheme.  The current version if Visual Studio 2015.  The next version is Visual Studio 15.  The link you posted was for the RTM of 2015, just over a year ago.  But 15 is still in Preview.  When 15 goes to RTM, then we can revisit the question of making 2015 the minimum required version.

On Fri, Jul 29, 2016 at 11:29 AM Piotr Padlewski <piotr.padlewski at gmail.com<mailto:piotr.padlewski at gmail.com>> wrote:

Is it time?

2016-03-31 12:03 GMT-07:00 Aaron Ballman via llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>>:
On Thu, Mar 31, 2016 at 2:57 PM, Zachary Turner <zturner at google.com<mailto:zturner at google.com>> wrote:
> On Tue, Mar 29, 2016 at 10:42 AM Aaron Ballman <aaron at aaronballman.com<mailto:aaron at aaronballman.com>>
> wrote:
>> Not everyone can upgrade to the latest version of the toolchain, even
>> if it has been released for a while. We did drop MSVC 2012 support
>> early, but MSVC 2015 was in RC or RTM stages by that point, and we had
>> some pretty big incentive to upgrade early (without function templates
>> supporting default arguments, the AST matcher DSL made for really slow
>> compiles of Clang itself, and resulted in a larger executable size
>> among other things, IIRC).
> I know you mentioned that one of the reasons we upgraded to 2013 was because
> 2015 was in RC or RTM.  Ironically, the day after I posted this MS announced
> Visual Studio 15 preview  (which is confusingly the version *after* Visual
> Studio 2015).

Hah, that is confusing!

> In any case, it's not an RC, and it's certainly not an RTM,
> but it is on the horizon.  So hopefully we can revisit this question when 15
> is in RC / RTM

I think that's a great time to revisit the question (transitioning
sometimes takes a bit of time since we want to ask people with out of
tree needs if they're ready before dropping support for major


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