boost.rb

class Boost < Formula
  desc "Collection of portable C++ source libraries"
  homepage "https://www.boost.org/"
  url "https://github.com/boostorg/boost/releases/download/boost-1.85.0/boost-1.85.0-b2-nodocs.tar.xz"
  sha256 "09f0628bded81d20b0145b30925d7d7492fd99583671586525d5d66d4c28266a"
  license "BSL-1.0"
  head "https://github.com/boostorg/boost.git", branch: "master"

  livecheck do
    url "https://www.boost.org/users/download/"
    regex(/href=.*?boost[._-]v?(\d+(?:[._]\d+)+)\.t/i)
    strategy :page_match do |page, regex|
      page.scan(regex).map { |match| match.first.tr("_", ".") }
    end
  end

  bottle do
    sha256 cellar: :any,                 arm64_sonoma:   "01c57670b0218a69dccf37142a2f79b5836350114c694adef930f2116df8d7eb"
    sha256 cellar: :any,                 arm64_ventura:  "c4e5b89b1dfeee3d39ad4dfda2be0acef88e4490fcbad82c61df8222cf96b547"
    sha256 cellar: :any,                 arm64_monterey: "4784f99d2e99d5cbcac457b05b89ec26338ceb0766394c7182be71b2843e32c6"
    sha256 cellar: :any,                 sonoma:         "29cda46fdde152b849eaed96d533842b5ef144de8ff44010831ef9ed79932272"
    sha256 cellar: :any,                 ventura:        "de000507f16d623fdcf935bd3aa16891c9dc25647b7389791d01858a04842217"
    sha256 cellar: :any,                 monterey:       "322f5cad5fc34613d2e617138276ca390ac6e16c1cb52286381af98fea9b3526"
    sha256 cellar: :any_skip_relocation, x86_64_linux:   "24719603623f93428cd585e5a8abba44d7412aee3f9fe4743e2ff7432a2aeb9c"
  end

  depends_on "icu4c"
  depends_on "xz"
  depends_on "zstd"

  uses_from_macos "bzip2"
  uses_from_macos "zlib"

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

    # libdir should be set by --prefix but isn't
    icu4c_prefix = Formula["icu4c"].opt_prefix
    bootstrap_args = %W[
      --prefix=#{prefix}
      --libdir=#{lib}
      --with-icu=#{icu4c_prefix}
    ]

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

    # Boost.Log cannot be built using Apple GCC at the moment. Disabled
    # on such systems.
    without_libraries << "log" if ENV.compiler == :gcc

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

    # layout should be synchronized with boost-python and boost-mpi
    args = %W[
      --prefix=#{prefix}
      --libdir=#{lib}
      -d2
      -j#{ENV.make_jobs}
      --layout=tagged-1.66
      --user-config=user-config.jam
      install
      threading=multi,single
      link=shared,static
    ]

    # Boost is using "clang++ -x c" to select C compiler which breaks C++14
    # handling using ENV.cxx14. Using "cxxflags" and "linkflags" still works.
    args << "cxxflags=-std=c++14"
    args << "cxxflags=-stdlib=libc++" << "linkflags=-stdlib=libc++" if ENV.compiler == :clang

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

  test do
    (testpath/"test.cpp").write <<~EOS
      #include <boost/algorithm/string.hpp>
      #include <boost/iostreams/device/array.hpp>
      #include <boost/iostreams/device/back_inserter.hpp>
      #include <boost/iostreams/filter/zstd.hpp>
      #include <boost/iostreams/filtering_stream.hpp>
      #include <boost/iostreams/stream.hpp>

      #include <string>
      #include <iostream>
      #include <vector>
      #include <assert.h>

      using namespace boost::algorithm;
      using namespace boost::iostreams;
      using namespace std;

      int main()
      {
        string str("a,b");
        vector<string> strVec;
        split(strVec, str, is_any_of(","));
        assert(strVec.size()==2);
        assert(strVec[0]=="a");
        assert(strVec[1]=="b");

        // Test boost::iostreams::zstd_compressor() linking
        std::vector<char> v;
        back_insert_device<std::vector<char>> snk{v};
        filtering_ostream os;
        os.push(zstd_compressor());
        os.push(snk);
        os << "Boost" << std::flush;
        os.pop();

        array_source src{v.data(), v.size()};
        filtering_istream is;
        is.push(zstd_decompressor());
        is.push(src);
        std::string s;
        is >> s;

        assert(s == "Boost");

        return 0;
      }
    EOS
    system ENV.cxx, "test.cpp", "-std=c++14", "-o", "test", "-L#{lib}", "-lboost_iostreams",
                    "-L#{Formula["zstd"].opt_lib}", "-lzstd"
    system "./test"
  end
end