[cfe-dev] RFC: Bump toolchain requirements

[David Blaikie via cfe-dev]

Can't say I have any strong feelings on this - if it's consistent with
the policy (is it?) & there's something to be gained by it (sounds
like it), great.

(might want to check this recent thread
https://lists.llvm.org/pipermail/cfe-dev/2021-April/068034.html in
case there's anything interesting there - and maybe summarize some/any
of the previous discussions to bump the minimum version and why any
counterarguments in those discussions are now addressed)

On Tue, Apr 27, 2021 at 3:35 PM Stephen Kelly via cfe-dev
<cfe-dev at lists.llvm.org> wrote:
>
>
> Hi,
>
> the policy for updating the minimum compiler versions able to build llvm
> (and as a side-effect, the option of using features of a newer C++
> standard) is here:
>
>   https://llvm.org/docs/DeveloperPolicy.html#toolchain
>
> The current compiler requirements are documented here:
>
>   https://llvm.org/docs/GettingStarted.html#host-c-toolchain
>
> I don't know if buildbots verify those versions.
>
> I'm wondering if anyone has strong feelings for or against bumping the
> minimum compiler requirements to:
>
> * GCC 7.4 (Dec 2018 - https://gcc.gnu.org/gcc-7)
> * Clang 6.0 (Mar 2018 -
> https://lists.llvm.org/pipermail/llvm-announce/2018-March/000077.html)
> * MSVC 2019
> * AppleClang ??
>
> Those versions of GCC and Clang are available on Ubuntu 18.04 LTS.
>
>   https://packages.ubuntu.com/bionic-updates/clang
>   https://packages.ubuntu.com/bionic-updates/gcc
>
> Ubuntu 16.04 LTS is end-of-standard-support this month:
>
>   https://wiki.ubuntu.com/Releases
>
> Those compilers have much-improved C++17 support compared to the current
> baseline.
>
> Thanks,
>
> Stephen.
>
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