Closes Homebrew/homebrew#18788.

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>

Closes Homebrew/homebrew#18634.

Signed-off-by: Jack Nagel <jacknagel@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

Fixes Homebrew/homebrew#18631.

Fixes Homebrew/homebrew#18625.

- Store in the tab if a bottle was poured for the build.
- Add an additional line of output to `brew info` outputting whether
  the formula was built from source or poured from a bottle.

Closes Homebrew/homebrew#18430.
Closes Homebrew/homebrew#18475.

Fixes Homebrew/homebrew#16292.

This makes it requirable before superenv becomes active.

I understand how this works now, and it is definitely necessary.

Reader methods for specific checksum types have been absent from the
Formula class for some time, so there isn't any reason to expose them in
SoftwareSpec, either.

Thus, these methods now only act as setters, and #checksum should be
used to access the constructed Checksum object.

Fixes Homebrew/homebrew#18565.

git clean -f is not enough. Needs `-d` somtimes to
handle cases when we rename a dir.

Fixes Homebrew/homebrew#18544 and fixes Homebrew/homebrew#14224

Pending a decent fix.

Fixes Homebrew/homebrew#18540.

Under certain conditions, `brew update` will show doubles. It's a rare
edge-case, but if you have a tap where the name of the formula is identical
with the name of the insalled file, then you see output like this:

    ==> Updated Formulae
    aalib				   ssh-copy-id
    casperjs				   sshuttle
    jack				   telemachus/anytap/brew-any-tap
    mogenerator				   telemachus/anytap/brew-any-tap

I believe this should fix that.

Closes Homebrew/homebrew#18495.

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

The existing case-statement with nested if-statements is gross and hard
to extend. Replacing it with a priority queue simplifies the logic and
makes it very easy to add new compilers to the fails_with system, which
we will likely want to do in the future.

The original constraints that led to using a custom collection rather
than Array or Set here no longer exist, so let's avoid the pointless
abstraction here.

Closes Homebrew/homebrew#18520.

We want the new-style "/archive/" downloads.

* Add url check for GitHub home pages using http.
* Add url check for GitHub repo urls using http.
* Include url in error messages about url issues.

Closes Homebrew/homebrew#18372.

Closes Homebrew/homebrew#18481.

Added an option to linkapps to allow linking to /Applications rather
than ~/Applications

Closes Homebrew/homebrew#18196.

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