These have all been moved to Formulary.

Sporadically people ask to whitelist doctor warnings or file issues when
there's nothing actually wrong. Help reassure such people with a
friendly message.

Closes Homebrew/homebrew#30230.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Both build environments remove MACOSX_DEPLOYMENT_TARGET by default.

Fixes Homebrew/homebrew#30046.

Closes Homebrew/homebrew#29593.

Closes Homebrew/homebrew#29377.

Closes Homebrew/homebrew#29206.

cf. Homebrew/homebrew#28918.

Fixes Homebrew/homebrew#28901.

This reflects what Apple calls it in more recent versions of Xcode/OS X.

Fixes Homebrew/homebrew#28221.

I'm an idiot.

This reverts commit f890e4973840a66a522189c8e5530bff61d17162.

Closes Homebrew/homebrew#27619.

Closes Homebrew/homebrew#24788.

Sometimes (e.g. Homebrew/homebrew#27014) it may find an installed version but no prefix.

In this case we still want to tell users if it's outdated.

Fixes Homebrew/homebrew#25282.

`brew doctor` always complains about uncommitted modifications to
Homebrew when you have status.branch=true in your git config, because
the implicit --branch makes `git status -s` always print branch/tracking
info. The --porcelain mode is similar to -s/--short, but ignores most of
the user's config and should remain stable.

The --untracked-files option ensures we'll see untracked files even for
users with status.showUntrackedFiles=no, which is not suppressed by
--porcelain for some reason.

Closes Homebrew/homebrew#25230.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/homebrew#25211.

Since a bad xcode-select path can cause many brew commands to freeze,
it's worth warning users and bailing out as early as possible.

The doctor check wasn't good enough, since the doctor could freeze
before the warning about this was ever printed.

Closes Homebrew/homebrew#25170.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Closes Homebrew/homebrew#24173.

Closes Homebrew/homebrew#24094.