[cfe-dev] RFC: Removing clang-cl's /fallback option

[David Blaikie via cfe-dev]

+1 from me, fwiw - though I don't have much connection to the Windows
side of things.

On Mon, Jan 18, 2021 at 2:32 AM Hans Wennborg via cfe-dev
<cfe-dev at lists.llvm.org> wrote:
>
> clang-cl's /fallback option was added back in 2013 [1] as part of
> bringing up clang's native Windows support.
>
> Since then, the Windows support has become quite stable, and I'm not
> aware of anyone using /fallback anymore. In Chromium we stopped using
> it in 2015 [2].
>
> While /fallback doesn't require a lot of code, it does add a bit of
> complexity to the driver (for example it added a special type of Job),
> and I worry about the code rotting since it's not getting updated to
> handle new flags.
>
> So, are there any objections to removing the /fallback mode? My
> proposal is to put a note in the upcoming Clang 12 release, and then
> delete the code after the branch point, meaning it would be gone in
> Clang 13.
>
> Please let me know what you think.
>
> Thanks,
> Hans
>
> 1. https://github.com/llvm/llvm-project/commit/87cfa71071d73c702a833f19c9fe035f31c1275d
> 2. http://crrev.com/340533
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