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.

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

Closes Homebrew/homebrew#28878.

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

Closes Homebrew/homebrew#27813.

This is saved in HOMEBREW_OPTFLAGS and later mutated by
ENV.universal_binary, so if this returns nil the sub will fail.

In this case we need to handle the throwing on an exception when
attempting to initialize the gcc48 Formula object.

This initialization should be unnecessary if the core GCC is already
installed and rescued if not.