updated homebrew formula for Boehm-Demers-Weiser GC supporting building from head and passing in various options to the build

bdw-gc.rb

require 'formula'

class Formula
  def configure_path_args(choices={})
    vars = {
      :prefix           => self.prefix,
      :'exec-prefix'    => self.prefix,
      :bindir           => self.bin,
      :sbindir          => self.sbin,
      :libexecdir       => self.libexec,
      :sysconfdir       => self.etc,
      :localstatedir    => self.var,
      :libdir           => self.lib,
      :includedir       => self.include,
      :datarootdir      => self.share,
      :datadir          => self.share,
      :infodir          => self.info,
      :localedir        => self.share+'locale',
      :mandir           => self.man,
      :docdir           => self.doc,
      :htmldir          => self.doc,
      :dvidir           => self.doc,
      :pdfdir           => self.doc,
      :psdir            => self.doc,
    }.merge(choices)
    vars.map {|option, value| "--#{option}=#{value}" }
  end

  # can be used with a block:
  #   configure_flag('cow') { foo.can_moo? }
  #   => "--enable-cow"
  # the enable/disable strings can be customized:
  #   configure_flag('sparkles', 'with', 'without') { false }
  #   => "--without-sparkles"
  # you can also just pass in the flag and the state string you want:
  #   configure_flag('cupcakes', 'fuck-yeah')
  #   => "--fuck-yeah-cupcakes"
  def configure_flag(flag, enable='enable', disable='disable')
    if block_given?
      "--#{!!yield ? enable : disable}-#{flag}"
    else
      "--#{enable}-#{flag}"
    end
  end
end

class SubRepoStrategy < GitDownloadStrategy
  def initialize url, name, version, specs
    super
    @main_url = @url
    @main_clone = @clone
    @subrepo_url = specs[:subrepo]
    @subrepo_name = File.basename(@subrepo_url, '.git')
    @subrepo_clone = @clone+@subrepo_name
  end

  def fetch
    begin
      super
      @url = @subrepo_url
      @clone = @subrepo_clone
      super
    ensure
      @url = @main_url
      @clone = @main_clone
    end
  end

  def stage
    begin
      super
      @url = @subrepo_url
      @clone = @subrepo_clone
      super
    ensure
      @url = @main_url
      @clone = @main_clone
    end
  end
end

class BdwGc < Formula
  homepage 'http://www.hpl.hp.com/personal/Hans_Boehm/gc/'
  url 'http://www.hpl.hp.com/personal/Hans_Boehm/gc/gc_source/gc-7.2.tar.gz'
  md5 'd17aecedef3d73e75387fb63558fa4eb'

  head 'git://github.com/ivmai/bdwgc.git',
        :branch => 'master',
        :subrepo => 'git://github.com/ivmai/libatomic_ops.git',
        :using => SubRepoStrategy

  depends_on('autoconf' => :build) if ARGV.build_head?

  def options
    [
      ["--parallel-mark",       "parallelize marking and free list construction"],
      ["--disable-cplusplus",   "disable C++ support"],
      ["--gc-debug",            "include full support for pointer backtracing etc"],
      ["--gc-assertions",       "collector-internal assertion checking"],
      ["--redirect-malloc",     "redirect malloc and friends to GC routines"],
      ["--large-config",        "optimize for large (> 100MB) heap or root set"],
      ["--handle-fork",         "attempt to ensure a usable collector after fork()" \
                                " in multi-threaded programs"]
    ]
  end

  def install
    darwin_release = `uname -r`.to_f.floor
    ENV.append_to_cflags("-D_XOPEN_SOURCE=600 -D_DARWIN_C_SOURCE")
    ENV.remove_from_cflags('-D_XOPEN_SOURCE=600') if 8 >= darwin_release
    ENV.Og unless ARGV.build_stable?

    system "./autogen.sh" if ARGV.build_head?

    args =  '--disable-dependency-tracking',
            '--with-threads=posix',
            '--with-pic',
            '--with-libatomic-ops=check'
    args << configure_flag('parallel-mark')     {ARGV.flag?   '--parallel-mark'}
    args << configure_flag('cplusplus')         {!ARGV.flag?  '--disable-cplusplus'}
    args << configure_flag('gc-debug')          {ARGV.flag?   '--gc-debug'}
    args << configure_flag('redirect-malloc')   {ARGV.flag?   '--redirect-malloc'}
    args << configure_flag('handle-fork')       {ARGV.flag?   '--handle-fork'}
    args << configure_flag('gc-assertions')     {ARGV.flag?   '--gc-assertions'}

    system "./configure", *(self.configure_path_args + args)
    system "make"
    system "make check"
    system "make install"
  end
end