On Sat, Aug 7, 2021 at 7:40 AM Jeff King [off-list ref] wrote:

The distinction does not matter for our script (where we only care about
"clang4" and up). I guess the most relevant test would be to get XCode
8.x and see what it says. I expect it to claim "clang 8.1.0" or similar,
but actually be clang-3. And therefore not support
-Wtautological-constant-out-of-range-compare.

uses Xcode 7.3 (based on clang 3.8) and either does support that flag
or ignores it silently

  https://www.travis-ci.com/github/carenas/git/builds/234772346

the same was observed with Xcode 8

both error later and fail to build because of a valid (but harmless)
-Wformat-extra-args warning that doesn't trigger in later versions

Carlo