Closes Homebrew/homebrew#23445.

Declarations of dependencies, options, and resources in the DSL only
apply to specs that have already been initialized. For example, given
this snippet:

  url ...
  sha1 ...

  depends_on 'foo'

  devel do
    url ...
    sha1 ...
  end

The dependency 'foo' will be recorded for the stable spec, but not the
devel spec, since it was not initialized prior to the call to
depends_on.

While it is considered best practice to declare all specs (stable,
devel, head, and bottle) prior to other declarations, there is nothing
that enforces this ordering, so when it happens it can be confusing and
hard to debug.

To prevent this, we can initialize all specs up front. This comes with
a performance penalty for commands that load all formulae into memory,
but that is probably outweighed by what we gain in correctness.

Fixes Homebrew/homebrew#23425.

Closes Homebrew/homebrew#23430.

* PPC bottles are in the os_cpu format, e.g. :tiger_g3
* Intel bottles are the bare cat, as usual
* 64-bit bottles have _64 appended to them, e.g. :tiger_g5_64 or :leopard_64

Closes Homebrew/homebrew#23411.

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

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

* Using stderr breaks some configure script which fails due to contents
  available in stderr.

Closes Homebrew/homebrew#23322.

MacOS.gcc_42_build_version was returning nil if apple-gcc42 was
installed but unlinked, which was disjoint with how other parts of
Homebrew tried to see if it was present.

Fixes Homebrew/homebrew#23306.

* Now it includes all flags that are added or removed by superenv when
  passing "--verbose" or envvar VERBOSE or HOMEBREW_VERBOSE is set.

Closes Homebrew/homebrew#23138.

Closes Homebrew/homebrew#23267.

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

This should be a temporary workaround until we get a grip on some
Mavericks/Xcode 5.0 issues with e.g. ghc and go (stuff in core
that currently needs GCC at runtime). These formulae both have
Clang fixes in development.

Things that needs GCC at compile-time should be booted from core.

References Homebrew/homebrew#22872.
References Homebrew/homebrew-dupes#229