Today I ran
brew upgrade on my Mojave (10.14.6) setup and was presented the following warning:
Warning: You are using macOS 10.14. We (and Apple) do not provide support for this old version. You will encounter build failures with some formulae.
Is this warning safe to ignore and brew will only upgrade to package versions that support my OS version or will it just brute-force upgrade everything and potentially fail? I have no wish to upgrade from Mojave due to Apple's change in policy after that.