This was worded in a confusing way, and made an assumption about future
OS X versions that we don't know to be true.

Also, it's probably wrong to state that the CLT location is dependent on
the OS X version; surely there will be a newer CLT for 10.8 that gets
installed in the same location as on 10.9. But we don't know any better
yet.

This may be more accurate than guessing.

References Homebrew/homebrew#17383.

See Homebrew/homebrew#20935.

Closes homebrew/linuxbrew#16

Closes Homebrew/homebrew#20903.

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

Closes Homebrew/homebrew#20774.

CLT-only builds are still broken and need to be fixed at some point.

Closes Homebrew/homebrew#20524.

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

Closes Homebrew/homebrew#20507.

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

Closes Homebrew/homebrew#20410.
Closes Homebrew/homebrew#20401.

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

References Homebrew/homebrew#20142.

Closes Homebrew/homebrew#19227.

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

Closes Homebrew/homebrew#18683.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>

* CPU functions now exist in Hardware::CPU
* Added compatibility functions in compat/hardware_compat.rb
* Names are less specific to Mac hardware, e.g. CPU.family instead of
  Hardware.intel_family
* Hardware::CPU.family works for both Intel and PowerPC
* New helper methods on CPU, like .sse4? and .altivec?

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>

- The Library/ENV/4.3/xcrun shim now respects
  ENV['DEVELOPER_DIR'] instead assuming the location
  of /Applications/Xcode.app/Contents/Developer.
- The env var DEVELOPER_DIR is set if it is not
  already. So, during superenv this var is always set
  and we no longer have to care about people with unset
  or wrongly set xcode-select stuff. This has been
  a major PITA in the past.
- determine_developer_dir (which is used to set
  the DEVELOPER_DIR var) now uses MacOS::Xcode.prefix
  which is proven and very capable and uses splotlight
  correctly.
- Replace (and remove) MacSystem.xcode43_developer_dir
  with Xcode.prefix

Closes Homebrew/homebrew#18618