Create a package based upon a Gem spec. Gem packages, as well as zip files and tar/gzipped packages can be produced by this task.

In addition to the Rake targets generated by PackageTask, a GemPackageTask will also generate the following tasks:

"package_dir/name-version.gem"

Create a Ruby GEM package with the given name and version.

Example using a Ruby GEM spec:

  require 'rubygems'

  spec = Gem::Specification.new do |s|
    s.platform = Gem::Platform::RUBY
    s.summary = "Ruby based make-like utility."
    s.name = 'rake'
    s.version = PKG_VERSION
    s.requirements << 'none'
    s.require_path = 'lib'
    s.autorequire = 'rake'
    s.files = PKG_FILES
    s.description = <<EOF
  Rake is a Make-like program implemented in Ruby. Tasks
  and dependencies are specified in standard Ruby syntax.
  EOF
  end

  Rake::GemPackageTask.new(spec) do |pkg|
    pkg.need_zip = true
    pkg.need_tar = true
  end