Closes Homebrew/homebrew#28870.

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

This is consistent with how e.g. `gcc-4.2` is handled.

This means e.g. `ghc` can find `gcc-4.8` at runtime.

Fixes Homebrew/homebrew#28934.

Avoid throwing unnecessary exceptions by checking for paths existing and
creating formulae as late as possible. Additionally use instance
variables for some caching.

Instead check if the path exists by using opt.

Instead check if the path exists by using opt.

The APIs used by the software are no longer available in OS X 10.9.

Closes Homebrew/homebrew#25036.

This was added to the stdlib in https://github.com/ruby/ruby/commit/391fc2eeecfc2f0d0f851b0c27ba02e041fe2cd9.

See also https://bugs.ruby-lang.org/projects/ruby-trunk/repository/revisions/45826/diff/ext/pathname/lib/pathname.rb



Closes Homebrew/homebrew#28972.

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

Fails to build with clang or on non-/usr/local installs.

Closes Homebrew/homebrew#23024.

cf. Homebrew/homebrew#24802.

Closes Homebrew/homebrew#27238.

Last update was in 2006 and this software does not build with
modern compilers.

Closes Homebrew/homebrew#28939.

Fixes Homebrew/homebrew#28942.

Newer versions of Ruby issue a warning for repeated character classes.

This has been deprecated upstream in favor of AWS CLI.

Closes Homebrew/homebrew#28930.

 - the executed script is the formula file, build.rb is a library
 - ruby is invoked directly, so it wouldn't need to be executable anyway

Without it, String#undent would fail on unindented strings, e.g.:

    "foo".undent

NoMethodError: undefined method `length' for nil:NilClass`

Closes Homebrew/homebrew#28873.

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

After recent cleanups the code in this branch should be unreachable, so
there is little point in keeping it around.

cf. Homebrew/homebrew#28918.

Fixes Homebrew/homebrew#28901.

These methods are no longer required.

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

Since ae177adb2bd55ee5ad6367e7639c4cf0c774b63a, we can safely assume
that xcrun works, and a functioning xcrun will search dev_tools_path and
xctoolchain_path, so we can stop doing extra work here.

On CLT-only 10.7 and 10.8, xcrun will not work, but all the tools will
be in /usr/bin, which we check before invoking xcrun. Further, in this
case, dev_tools_path will be /usr/bin, and xctoolchain_path will not
exist, so the fallbacks here are unnecessary.