diff.rb

require "formula"

class UniversalPython < Requirement
  satisfy(:build_env => false) { archs_for_command("python").universal? }

  def message; <<-EOS.undent
    A universal build was requested, but Python is not a universal build

    Boost compiles against the Python it finds in the path; if this Python
    is not a universal build then linking will likely fail.
    EOS
  end
end

class UniversalPython3 < Requirement
  satisfy(:build_env => false) { archs_for_command("python3").universal? }

  def message; <<-EOS.undent
    A universal build was requested, but Python 3 is not a universal build

    Boost compiles against the Python 3 it finds in the path; if this Python
    is not a universal build then linking will likely fail.
    EOS
  end
end

class BoostPython < Formula
  homepage 'http://www.boost.org'
  url 'https://downloads.sourceforge.net/project/boost/boost/1.55.0/boost_1_55_0.tar.bz2'
  sha1 'cef9a0cc7084b1d639e06cd3bc34e4251524c840'

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

  env :userpaths

  option :universal
  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

  depends_on :python => :recommended
  depends_on :python3 => :optional
  depends_on UniversalPython if build.universal? and build.with? "python"
  depends_on UniversalPython3 if build.universal? and build.with? "python3"

  boost_dep_flags = []
  boost_dep_flags << "with-mpi" if build.with? "mpi"
  ["single", "static"].each{ |opt| boost_dep_flags << "without-#{opt}" if build.without? opt }
  ["cxx11", "universal"].each { |opt| boost_dep_flags << opt if build.include? opt }
  depends_on "boost" => boost_dep_flags

  stable do
    # Patches boost::atomic for LLVM 3.4 as it is used on OS X 10.9 with Xcode 5.1
    # https://github.com/Homebrew/homebrew/issues/27396
    # https://github.com/Homebrew/homebrew/pull/27436
    patch :p2 do
      url "https://github.com/boostorg/atomic/commit/6bb71fdd.diff"
      sha1 "ca8679011d5293a7fd02cb3b97dde3515b8b2b03"
    end

    patch :p2 do
      url "https://github.com/boostorg/atomic/commit/e4bde20f.diff"
      sha1 "b68f5536474c9f543879698299bd4975538a89eb"
    end

    # Patch fixes upstream issue reported here (https://svn.boost.org/trac/boost/ticket/9698).
    # Will be fixed in Boost 1.56 and can be removed once that release is available.
    # See this issue (https://github.com/Homebrew/homebrew/issues/30592) for more details.

    patch :p2 do
      url "https://github.com/boostorg/chrono/commit/143260d.diff"
      sha1 "2600214608e7706116831d6ffc302d099ba09950"
    end

    # Patch boost::serialization for Clang
    # https://svn.boost.org/trac/boost/ticket/8757
    patch :p1 do
      url "https://gist.githubusercontent.com/philacs/375303205d5f8918e700/raw/d6ded52c3a927b6558984d22efe0a5cf9e59cd8c/0005-Boost.S11n-include-missing-algorithm.patch"
      sha1 "a37552d48e5c1c0507ee9d48fb82a3fa5e3bc9fa"
    end
  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

    if build.cxx11? and build.with? 'mpi' and (build.with? 'python' \
                                               or build.with? 'python3')
      raise <<-EOS.undent
        Building MPI support for Python using C++11 mode results in
        failure and hence disabled.  Please don't use this combination
        of options.
      EOS
    end

    ENV.universal_binary if build.universal?

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

      # Link against correct version of Python if python3 build was requested
      if build.with? 'python3'
        py3executable = `which python3`.strip
        py3version = `python3 -c "import sys; print(sys.version[:3])"`.strip
        py3prefix = `python3 -c "import sys; print(sys.prefix)"`.strip

        file.write <<-EOS.undent
          using python : #{py3version}
                       : #{py3executable}
                       : #{py3prefix}/include/python#{py3version}m
                       : #{py3prefix}/lib ;
        EOS
      end
    end

    # we specify libdir too because the script is apparently broken
    bargs = ["--prefix=#{prefix}", "--libdir=#{lib}"]


    bargs << "--with-libraries=python"

    args = ["--prefix=#{prefix}",
            "--libdir=#{lib}",
            "-d2",
            "-j#{ENV.make_jobs}",
            "--layout=tagged",
            "--user-config=user-config.jam"]

    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", *bargs
    system "./b2", *args

    lib.install Dir["stage/lib/*"]
    # already installed by the boost bottle
    # (prefix/'include/boost/python').install Dir["boost/python/*"]
  end
end