[llvm-dev] Unable to build llvm/clang 10.0.1 sources using visual studio 2017 compiler

[Reid Kleckner via llvm-dev]

We do still support the VS 2017 compiler series, but we don't support the
earliest release. Try updating VS 2017.

I looked at the code in raw_ostream.h, reduced it, and did some experiments
with it on godbolt:
https://gcc.godbolt.org/z/5WvEz9
As you can see, MSVC 19.10 rejects this code, but 19.14 and newer accept
this code. So, my recommendation is to update the compiler. You don't have
to upgrade to VS 2019, you just need to run the updater inside Visual
Studio.

Coincidentally, we recently raised our minimum _MSC_VER from 1910 to 1914
for unrelated reasons:
https://github.com/llvm/llvm-project/commit/e61a6a229a992d291da81ab96299669e8d28d6ad

If upgrading is impossible, you can simply delete the `enum` tag in the
declaration of changeColors.

On Fri, Dec 11, 2020 at 8:00 AM Sudhindra kulkarni via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi Team,
>                   I  downloaded the llvm/clang sources version 10.0.1
> ,built the visual studio solution using cmake. I am using Windows as my
> platform and visual studio version is 2017 community edition.
>
> I get the compilation error as shown in the below screenshot.
> Is llvm/clang 10.0.1 buildable using MSVC 2017 or is there a known issue.
> Please guide me.
> Thanks in advance
>
> Thanks and Regards
> Sudhindra Kulkarni
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> llvm-dev at lists.llvm.org
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