MSVC is now officially unsupported

[Nico Weber]

Hi,

a little under 3 years ago, we removed Chromium's MSVC bots and moved it to a community-supported toolchain [1].

Since nobody seemed to maintain that build configuration, we made building with MSVC a hard error about half a year ago and had several stable releases since then [2].

We haven't had any complaints about this lack of support. So we're hereby officially moving MSVC from "community supported" to "not supported".

If you own any chromium code that has MSVC compatibility hacks, feel free to delete them.

Nico

ps: Note that some of Chromium's subprojects, such as v8, still support MSVC. Since they use some of chromium's build files, we'll keep MSVC support in .gn files in build/ for these projects. But most of Chromium's tree isn't shared with other projects.

1: https://groups.google.com/a/chromium.org/d/msg/chromium-dev/QtHvwq5-lOE/mhcAvi1RBQAJ

2: https://chromium-review.googlesource.com/c/chromium/src/+/1721454

[Nico Weber]

You can use https://bugs.chromium.org/p/chromium/issues/detail?id=1053958 for cleanup CLs.