At Codeplay we are currently building on windows using a split of MSVC 2013 and MSVC 2015. In theory we are happy to move entirely to 2015, but until then we would have to work around any 2013 breakages.

On 29/03/2016 16:16, Pavel Labath via lldb-dev wrote:
Zachary, all,

after overcoming some problems, mostly unrelated to MSVC, we have
finally managed to switch to VS2015. I think that means there are no
more VS2013 users remaining. Given that, shall we start the process to
formally allow c++ features, which were blocked due to VS2013 until
now? I am mostly thinking about thread-safe function-static variable
initialization and alias templates here...

what do you think?
pl


On 4 February 2016 at 20:23, Ted Woodward <ted.woodw...@codeaurora.org> wrote:
We can change to 3+2015; if you guys don't think 2+2013 is useful, we'll do 
that.

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-----Original Message-----
From: Pavel Labath [mailto:lab...@google.com]
Sent: Thursday, February 04, 2016 10:01 AM
To: Ted Woodward
Cc: Zachary Turner; LLDB
Subject: Re: [lldb-dev] MSVC 2013 w/ Python 2.7 is moving to an unsupported 
toolchain

Hi all.

we (android lldb team) are starting to transition to VS2015 as well.
For now, the plan is to stick to python 2.7, but if we encounter problems there, the 
backup plan is to go to python 3 as well. Until then (I estimate that will take 1--2 
weeks) our buildbot <http://lab.llvm.org:8011/builders/lldb-windows7-android> 
will continue building 2.7+2013 and we will be making sure it works, so please don't 
check in any VS2013 incompatible code (yet).

Ted: If you can't switch to the 3+2015 combination (which I *do* recommend you 
try), maybe you can go half-way and switch to 2.7+2015 (I can show you how to 
build python 2.7 with VS2015). If you stick with 2.7+2013 combo, it will soon 
be up to you to chase anyone who adds 2013-breaking changes...

pl


On 2 February 2016 at 23:42, Ted Woodward via lldb-dev 
<lldb-dev@lists.llvm.org> wrote:
No, it turned red Friday night/Saturday morning.



Last good build:

http://lab.llvm.org:8011/builders/lldb-x86-win7-msvc/builds/15167



First bad build:

http://lab.llvm.org:8011/builders/lldb-x86-win7-msvc/builds/15168



It went red because of the change to VS2015/Python 3.5.



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From: Zachary Turner [mailto:ztur...@google.com]
Sent: Tuesday, February 02, 2016 5:28 PM


To: Ted Woodward; LLDB
Subject: Re: [lldb-dev] MSVC 2013 w/ Python 2.7 is moving to an
unsupported toolchain



BTW, I expect that your buildbot has been experiencing the problems
with the
x86 / x64 toolchain for quite some time, because it's not really
relevant to how much memory your machine has, but just that it was
using an x86 toolchain at all.  Has it been red for a long time?



On Tue, Feb 2, 2016 at 1:48 PM Zachary Turner <ztur...@google.com> wrote:

You may have to make some changes to the zorg scripts to keep that working.
I didn't realize there were any other bots building LLDB, so I made
some changes that will default everything to VS2015 and Py3.



BTW, is your builder doing a debug build or a release build?  When
doing a debug build clang now requires more memory than can fit in a
4GB address space to link, so using an x86 toolchain won't work
anymore.  I forced a change to use the amd64_x86 toolchain, but this
won't work unless the version of python used by buildbot is a 64-bit
Python distro (because Python.exe is what ultimately calls vcvarsall
and cmake and it inherits the environment of the parent).



So I think you will need to do all this as well.



On Tue, Feb 2, 2016 at 1:44 PM Ted Woodward
<ted.woodw...@codeaurora.org>
wrote:

Then maybe we should keep it 2013/py2.7, until llvm requires 2015.



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a Linux Foundation Collaborative Project



From: Zachary Turner [mailto:ztur...@google.com]
Sent: Tuesday, February 02, 2016 3:43 PM


To: Ted Woodward; LLDB
Subject: Re: [lldb-dev] MSVC 2013 w/ Python 2.7 is moving to an
unsupported toolchain



It's Server 2008 R2 technically, which is the server version of Win 7
(same API set, same OS features, etc).  So yea, I'm pretty confident
that test coverage is going to be 100% the same across both.  It's
just a matter of if you want to have something that you maintain /
have control over, or if you want to test something in a different way than 
what we're testing.



On Tue, Feb 2, 2016 at 1:29 PM Ted Woodward
<ted.woodw...@codeaurora.org>
wrote:

Yours is Win Server 2008; ours is Win 7. I don’t know if that matters.



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a Linux Foundation Collaborative Project



From: Zachary Turner [mailto:ztur...@google.com]
Sent: Tuesday, February 02, 2016 2:48 PM
To: Ted Woodward; LLDB


Subject: Re: [lldb-dev] MSVC 2013 w/ Python 2.7 is moving to an
unsupported toolchain



If I remember correctly your bot isn't actually doing anything
differently than my bot 
[http://lab.llvm.org:8011/builders/lldb-x86-windows-msvc2015].
If you want you could just remove your bot.  If you want to keep it,
then yea getting it on VS2015 and Python 3 would be the best idea.



On Tue, Feb 2, 2016 at 12:20 PM Ted Woodward via lldb-dev
<lldb-dev@lists.llvm.org> wrote:

It looks like our bot,
http://lab.llvm.org:8011/builders/lldb-x86-win7-msvc
, has tried to update to Python 3.5 and MSVC 2015, but it can’t find
python or VC. I’ll talk to our buildmiester about it.



Should we run this guy with 2013/py2.7 or 2015/py3.5?



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The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project



From: lldb-dev [mailto:lldb-dev-boun...@lists.llvm.org] On Behalf Of
Zachary Turner via lldb-dev
Sent: Tuesday, February 02, 2016 1:55 PM
To: Tamas Berghammer; LLDB
Subject: Re: [lldb-dev] MSVC 2013 w/ Python 2.7 is moving to an
unsupported toolchain





On Tue, Feb 2, 2016 at 11:42 AM Tamas Berghammer
<tbergham...@google.com>
wrote:

Hi Zachary,



We are still using MSVC 2013 and Python 2.7 to compile LLDB on Windows
for Android Studio and we also have a buildbot what is testing this
configuration (without sending e-mail at the moment) here:
http://lab.llvm.org:8011/builders/lldb-windows7-android



We are in the discussion to decide what is our plan for going forward
both in terms of Visual Studio version and Python version and I expect
that we will make a decision this week. Until then please don't remove
any hack we have in the code because of MSVC 2013 (e.g. alias template
workarounds) and if adding new code then please try not to break MSVC
2013. I will send out an update about our decision hopefully at the end of this 
week.

Yea I mentioned already that I'm not planning on removing anything
related to MSVC 2013, just that I'm personally not supporting it.
Which means that if anyone asks for help, or wants to make it work, or
if it breaks accidentally, they're on their own :)  I don't even have
MSVC 2013 installed on my machine anymore, so I can't fix any MSVC
2013 specific issues that arise.



Of course if someone else comes along and wants to help, I have no
problem with that, but due to the difficulty of dealing with
incompatibility between Python 2 and MSVC 2015, it's just going to be
up to someone else to continue making that work if they need it.





You mentioned that LLVM plan to bump the minimum version of MSVC to
2015. Do you have any link to the place where they discussed it or do
you know anything about the schedule?



As far as I know the discussion hasn't started yet, but historically
LLVM has always been pretty consistent about bumping the required MSVC version
every 12-18 months.   I know some of the Windows people on the LLVM side are
already "unoficially" using MSVC 2015 on a regular basis, and that's
usually a sign that people are getting an early start to see what kind
of issues might be encountered by the general public when bumping the
required version.

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