These days Homebrew refuses to do anything if the xcode-select path is
busted, so this workaround is unnecessary.

This software compiles against now-private APIs:
https://github.com/Homebrew/homebrew/issues/24748
http://bugs.mysql.com/bug.php?id=70672
https://answers.launchpad.net/mydumper/+question/239895

Closes Homebrew/homebrew#24748.

Closes Homebrew/homebrew#27345.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Handle formula URLs with query parameters. This is useful for fetching formulas from cgit repositories, which uses ?h= to choose branches.

Closes Homebrew/homebrew#28314.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

This is already covered in test_mach.rb.

This is handled here:
https://github.com/Homebrew/homebrew/blob/67fbb313da8843234c4d1785c9c074af5a025394/Library/brew.rb#L34-46

It may be that even installing a new compiler doesn't fix things so
detect that case and skip the formula installation rather than erroring
out.

This will allow the reading and checking of formulae that mirror
Homebrew core formulae (e.g. `git` in a tap) and, with the previous exit
code changes, is a reasonable check for "are all the formulae in taps
updated to the latest core DSL".

Closes Homebrew/homebrew#28328.

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