Closes Homebrew/homebrew#39167.
Closes Homebrew/homebrew#46727.

Signed-off-by: Dominyk Tiller <dominyktiller@gmail.com>

Fixes a couple issues left behind by Homebrew/homebrew#46676.

Closes Homebrew/homebrew#46706.

Signed-off-by: Andrew Janke <andrew@apjanke.net>

Otherwise it would assume if `cask` was tapped it was also installed.

This matches similar caveats messages.

`MacOS.sdk` and `.sdk_path` will now return the newest installed SDK
instead of nil if called on a system that doesn’t have an SDK for the
currently-installed OS. For example, Xcode 7 on OS X 10.10 does not
include the 10.10 SDK, only the 10.11 SDK; software can be built by
specifying both SDKROOT and MACOSX_DEPLOYMENT_TARGET.

* Pull SDK lookup code into a new `locator` class, which caches its
  results
* SDKLocator only queries one SDK location, not all SDK locations
* Build a map of all installed SDKs inside that location, instead of
  just the requested SDK
* Ask xcrun for --show-sdk-platform-path first so that all SDKs can be
  found, instead of asking xcodebuild for a specific SDK
* Add a new `SDK` class, which tracks the version and the prefix; add a
  new `MacOS.sdk` method which returns an `SDK` instance instead of a
  bare path; MacOS.sdk_path still returns a bare path

Sometimes the linkage means the recursive dependencies also link to
libraries and need bumped.

Across info, search and update.

Closes Homebrew/homebrew#45131.

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

HOMEBREW_RUBY_PATH is always set.

Remove duplication, link to the API documentation more often,
tweak wording, add `@UniqMartin` as a maintainer, note `@jacknagel`'s
and `@adamv`'s significant past contributions to Homebrew, delete some
outdated or unneeded documentation, add some missing `Formula` API.
entries and simplify/improve `CONTRIBUTING.md`.

Closes Homebrew/homebrew#46179.

Closes Homebrew/homebrew#46618.

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

Do a reset to `origin/master` and then stash but don't pop the stash
after running update (unless you were on a branch). This may be mildly
more annoying for Homebrew developers but means it's easier for our
users who don't understand Git (and particularly when they don't
understand that every tap is a separate Git repository).

Closes Homebrew/homebrew#45825.

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

This matches the behaviour when `brew install`ing formulae.

Closes Homebrew/homebrew#46490.

Closes Homebrew/homebrew#46619.

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

Closes Homebrew/homebrew#44769

Closes Homebrew/homebrew#46676.

Signed-off-by: Andrew Janke <andrew@apjanke.net>

Closes Homebrew/homebrew#46604.

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

Closes Homebrew/homebrew#46428.

Closes Homebrew/homebrew#46652.

Signed-off-by: Dominyk Tiller <dominyktiller@gmail.com>

This package is deprecated and no longer used. It can now be found in
the boneyard tap.

Closes Homebrew/homebrew#46592.

Signed-off-by: Dominyk Tiller <dominyktiller@gmail.com>

Closes Homebrew/homebrew#46537.

Signed-off-by: Xu Cheng <xucheng@me.com>

For typical installations where `brew` is not a symbolic link, this
reduces the number of processes that need to be spawned.

Closes Homebrew/homebrew#46269.

Signed-off-by: Martin Afanasjew <martin@afanasjew.de>

This reduces the number of processes that need to be forked. If
libtool's `config.guess` is to be trusted, there was never another
spelling/capitalization other that `Darwin`.

This very slightly reduces duplication and the risk of inconsistency by
exporting in one branch, but not the other. By putting all the `export`
statements right before the `exec` it is more obvious what is passed on.

While `var=$(<command>)` is perfectly valid and won't create any issues,
it is often surprising for less shell-savvy users. Quoting these cases
like in all other instances makes the code more uniform, helps to avoid
future mistakes, and has no downsides.

Closes Homebrew/homebrew#46510.

Signed-off-by: Baptiste Fontaine <batifon@yahoo.fr>

Closes Homebrew/homebrew#46394.

Signed-off-by: Baptiste Fontaine <batifon@yahoo.fr>

Closes Homebrew/homebrew#46434.

Signed-off-by: Alex Dunn <dunn.alex@gmail.com>

Closes Homebrew/homebrew#46468.

Signed-off-by: Xu Cheng <xucheng@me.com>