llvm dev - Feb 2019 - [cfe-dev] [PSA] minimum toolchain update completed

Hello compiler fans!

As discussed in the RFC
<http://lists.llvm.org/pipermail/llvm-dev/2019-January/129452.html>,
LLVM’s cmake configuration now soft-errors if you use an older toolchain to
build. The new minimums are:

* Clang 3.5
* Apple Clang 6.0
* GCC 5.1
* Visual Studio 2017

You can opt-out of the soft-error with LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN.
You’ll still want to update your toolchain because that soft-error will become a
hard-error once we move away from C++11, and we would truly miss you. I will
send another RFC for this migration away from C++11 at the end of March 2019.

Happy compiling!

JF
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Note that the minimum version of "Visual Studio 2017" is not "any
old Visual Studio 2017" because I just tripped over that.
The cmake configuration wants version 19.1 or later, so 19.0 is not sufficient.
--paulr

From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of JF
Bastien via llvm-dev
Sent: Friday, February 08, 2019 1:16 PM
To: via llvm-dev; cfe-dev
Subject: [llvm-dev] [PSA] minimum toolchain update completed

Hello compiler fans!

As discussed in the
RFC<http://lists.llvm.org/pipermail/llvm-dev/2019-January/129452.html>,
LLVM’s cmake configuration now soft-errors if you use an older toolchain to
build. The new minimums are:

* Clang 3.5
* Apple Clang 6.0
* GCC 5.1
* Visual Studio 2017

You can opt-out of the soft-error with LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN.
You’ll still want to update your toolchain because that soft-error will become a
hard-error once we move away from C++11, and we would truly miss you. I will
send another RFC for this migration away from C++11 at the end of March 2019.

Happy compiling!

JF
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At Microsoft, we believe that we gain a competitive advantage by making the
Visual Studio versioning story as complicated as possible. To wit:

The compiler in the first VS 2015 release was version 19.00. For each
update/hotfix release, we bumped that version by .01. When VS 2017 was
released, we decided to keep the major compiler version the same to signify
backwards-binary-compatibility with the VS 2015 series compilers, so the
initial VS2017 compiler was version 19.10. We continued the practice of
bumping the second decimal place for each toolset update, which is a less
frequent occurrence than a VS update, so the VS 2017 15.9 compiler is
version 19.16. VS2019 will similarly start at 19.20.

So yes, "19.1 or higher" is "any old VS2017 version."

On Fri, Feb 8, 2019 at 10:22 AM via cfe-dev <cfe-dev at lists.llvm.org>
wrote:
> Note that the minimum version of "Visual Studio 2017" is not
"any old
> Visual Studio 2017" because I just tripped over that.
>
> The cmake configuration wants version 19.1 or later, so 19.0 is not
> sufficient.
>
> --paulr
>
>
>
> *From:* llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] *On Behalf Of
*JF
> Bastien via llvm-dev
> *Sent:* Friday, February 08, 2019 1:16 PM
> *To:* via llvm-dev; cfe-dev
> *Subject:* [llvm-dev] [PSA] minimum toolchain update completed
>
>
>
> Hello compiler fans!
>
>
>
> As discussed in the RFC
> <http://lists.llvm.org/pipermail/llvm-dev/2019-January/129452.html>,
> LLVM’s cmake configuration now soft-errors if you use an older toolchain to
> build. The new minimums are:
>
>
> * Clang 3.5
> * Apple Clang 6.0
> * GCC 5.1
> * Visual Studio 2017
>
>
>
> You can opt-out of the soft-error with
> LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN. You’ll still want to update your
> toolchain because that soft-error will become a hard-error once we move
> away from C++11, and we would truly miss you. I will send another RFC for
> this migration away from C++11 at the end of March 2019.
>
>
>
> Happy compiling!
>
>
>
> JF
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
>
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The follow-on patch at https://reviews.llvm.org/D58682 may affect users who
are on old versions of libstdc++ that slipped through the previous checks.
In particular, if you use newer bugfix releases of old versions of
libstdc++ with a new compiler, there is a chance that you did not encounter
the soft error that was previously implemented. Nevertheless, support for
your environment might be going away soon. The aforementioned patch will
improve detection for such environments.

-- HT

On Fri, Feb 8, 2019 at 1:15 PM JF Bastien via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Hello compiler fans!
>
> As discussed in the RFC
> <http://lists.llvm.org/pipermail/llvm-dev/2019-January/129452.html>,
> LLVM’s cmake configuration now soft-errors if you use an older toolchain to
> build. The new minimums are:
>
> * Clang 3.5
> * Apple Clang 6.0
> * GCC 5.1
> * Visual Studio 2017
>
> You can opt-out of the soft-error with
> LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN. You’ll still want to update your
> toolchain because that soft-error will become a hard-error once we move
> away from C++11, and we would truly miss you. I will send another RFC for
> this migration away from C++11 at the end of March 2019.
>
> Happy compiling!
>
> JF
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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