class Boost < Formula
  homepage "http://www.boost.org"
  url "https://downloads.sourceforge.net/project/boost/boost/1.57.0/boost_1_57_0.tar.bz2"
  sha1 "e151557ae47afd1b43dc3fac46f8b04a8fe51c12"

  head "https://github.com/boostorg/boost.git"

  bottle do
    cellar :any
    sha1 "5eaa834239277ba3fabdf0f6664400e4e2ff29b4" => :yosemite
    sha1 "4475c631c1107d50a4da54db5d5cbf938b890a9a" => :mavericks
    sha1 "4ba6d875fe24548b8af3c0b6631ded562d2da40f" => :mountain_lion
  end

  env :userpaths

  option :universal
  option "with-icu4c", "Build regexp engine with icu support"
  option "without-single", "Disable building single-threading variant"
  option "without-static", "Disable building static library variant"
  option "with-mpi", "Build with MPI support"
  option :cxx11

  deprecated_option "with-icu" => "with-icu4c"

  if build.cxx11?
    depends_on "icu4c" => [:optional, "c++11"]
    depends_on "open-mpi" => "c++11" if build.with? "mpi"
  else
    depends_on "icu4c" => :optional
    depends_on :mpi => [:cc, :cxx, :optional]
  end

  fails_with :llvm do
    build 2335
    cause "Dropped arguments to functions when linking with boost"
  end

  def install
    # https://svn.boost.org/trac/boost/ticket/8841
    if build.with? "mpi" and build.with? "single"
      raise <<-EOS.undent
        Building MPI support for both single and multi-threaded flavors
        is not supported.  Please use "--with-mpi" together with
        "--without-single".
      EOS
    end

    ENV.universal_binary if build.universal?

    # Force boost to compile with the desired compiler
    open("user-config.jam", "a") do |file|
      file.write "using darwin : : #{ENV.cxx} ;\n"
      file.write "using mpi ;\n" if build.with? "mpi"
    end

    # libdir should be set by --prefix but isn't
    bootstrap_args = ["--prefix=#{prefix}", "--libdir=#{lib}"]

    if build.with? "icu"
      icu4c_prefix = Formula["icu4c"].opt_prefix
      bootstrap_args << "--with-icu=#{icu4c_prefix}"
    else
      bootstrap_args << "--without-icu"
    end

    # Handle libraries that will not be built.
    without_libraries = ["python"]

    # The context library is implemented as x86_64 ASM, so it
    # won't build on PPC or 32-bit builds
    # see https://github.com/Homebrew/homebrew/issues/17646
    if Hardware::CPU.ppc? || Hardware::CPU.is_32_bit? || build.universal?
      without_libraries << "context"
      # The coroutine library depends on the context library.
      without_libraries << "coroutine"
    end

    # Boost.Log cannot be built using Apple GCC at the moment. Disabled
    # on such systems.
    without_libraries << "log" if ENV.compiler == :gcc || ENV.compiler == :llvm
    without_libraries << "mpi" if build.without? "mpi"

    bootstrap_args << "--without-libraries=#{without_libraries.join(",")}"

    # layout should be synchronized with boost-python
    args = ["--prefix=#{prefix}",
            "--libdir=#{lib}",
            "-d2",
            "-j#{ENV.make_jobs}",
            "--layout=tagged",
            "--user-config=user-config.jam",
            "install"]

    if build.with? "single"
      args << "threading=multi,single"
    else
      args << "threading=multi"
    end

    if build.with? "static"
      args << "link=shared,static"
    else
      args << "link=shared"
    end

    args << "address-model=32_64" << "architecture=x86" << "pch=off" if build.universal?

    # Trunk starts using "clang++ -x c" to select C compiler which breaks C++11
    # handling using ENV.cxx11. Using "cxxflags" and "linkflags" still works.
    if build.cxx11?
      args << "cxxflags=-std=c++11"
      if ENV.compiler == :clang
        args << "cxxflags=-stdlib=libc++" << "linkflags=-stdlib=libc++"
      end
    end

    system "./bootstrap.sh", *bootstrap_args
    system "./b2", *args
  end

  def caveats
    s = ""
    # ENV.compiler doesn't exist in caveats. Check library availability
    # instead.
    if Dir["#{lib}/libboost_log*"].empty?
      s += <<-EOS.undent

      Building of Boost.Log is disabled because it requires newer GCC or Clang.
      EOS
    end

    if Hardware::CPU.ppc? || Hardware::CPU.is_32_bit? || build.universal?
      s += <<-EOS.undent

      Building of Boost.Context and Boost.Coroutine is disabled as they are
      only supported on x86_64.
      EOS
    end

    s
  end
end