[webkit-dev] Finding when a platform was dropped

[Elliott Williams]

On Apple platforms, we do not specifically “turn off” support for older OSes. WebKit’s build is configured to deploy to whichever SDK version you have installed.

That said, you can see when we stop building for a specific OS version in our continuous integration, which is a good indicator of when we drop support for it. Two ways to do this are:

1. Check the history of Tools/CISupport/ews-build/config.json. For example, https://github.com/WebKit/WebKit/commit/eb60908303ab4874a8926527756e19b6ae6e4cdb is when CI stopped building Big Sur.

2. On https://webkit.org/build-archives/, look at the latest commit for a macOS version. This shows that the last commit our infrastructure built for Big Sur was `261428 at main`.

Every year, some time after removing CI support for an OS release, we actually strip out the conditional code for that version, at which point the build would truly break.

Hope this helps!
Elliott

> On Jul 8, 2023, at 09:55, Ben Huntsman via webkit-dev <webkit-dev at lists.webkit.org> wrote:
> 
> Hi there-
>    Not sure if this is the right place to ask, so please forgive me if this is the wrong forum.
> 
>    How would one go about determining what the last build of WebKit that would compile on a given platform is?  For example, if I wanted to see when support for MacOS 10.14, or 10.15, etc was dropped?
> 
>    Thank you so much!
> 
> -Ben
> 
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