erlang@20 20.3.8 (new formula)

Formula/erlang@20.rb

@@ -0,0 +1,105 @@
+class ErlangAT20 < Formula
+  desc "Programming language for highly scalable real-time systems"
+  homepage "https://www.erlang.org/"
+  # Download tarball from GitHub; it is served faster than the official tarball.
+  url "https://github.com/erlang/otp/archive/OTP-20.3.8.tar.gz"
+  sha256 "a7e59c531605fbd19ceac0568ae81c89ec690449e861da6e3598399f9c4b747f"
+  head "https://github.com/erlang/otp.git", :branch => "maint-20"
+
+  keg_only :versioned_formula
+
+  option "without-hipe", "Disable building hipe; fails on various macOS systems"
+  option "with-native-libs", "Enable native library compilation"
+  option "with-dirty-schedulers", "Enable experimental dirty schedulers"
+  option "with-java", "Build jinterface application"
+  option "without-docs", "Do not install documentation"
+
+  deprecated_option "disable-hipe" => "without-hipe"
+  deprecated_option "no-docs" => "without-docs"
+
+  depends_on "autoconf" => :build
+  depends_on "automake" => :build
+  depends_on "libtool" => :build
+  depends_on "openssl"
+  depends_on "fop" => :optional # enables building PDF docs
+  depends_on :java => :optional
+  depends_on "wxmac" => :recommended # for GUI apps like observer
+
+  resource "man" do
+    url "https://www.erlang.org/download/otp_doc_man_20.3.tar.gz"
+    mirror "https://fossies.org/linux/misc/legacy/otp_doc_man_20.3.tar.gz"
+    sha256 "17e0b2f94f11576a12526614a906ecad629b8804c25e6c18523f7c4346607112"
+  end
+
+  resource "html" do
+    url "https://www.erlang.org/download/otp_doc_html_20.3.tar.gz"
+    mirror "https://fossies.org/linux/misc/legacy/otp_doc_html_20.3.tar.gz"
+    sha256 "8099b62e9fa24b3f90eaeda151fa23ae729c8297e7d3fd8adaca865b35a3125d"
+  end
+
+  def install
+    # Unset these so that building wx, kernel, compiler and
+    # other modules doesn't fail with an unintelligable error.
+    %w[LIBS FLAGS AFLAGS ZFLAGS].each { |k| ENV.delete("ERL_#{k}") }
+
+    ENV["FOP"] = "#{HOMEBREW_PREFIX}/bin/fop" if build.with? "fop"
+
+    # Do this if building from a checkout to generate configure
+    system "./otp_build", "autoconf" if File.exist? "otp_build"
+
+    args = %W[
+      --disable-debug
+      --disable-silent-rules
+      --prefix=#{prefix}
+      --enable-kernel-poll
+      --enable-threads
+      --enable-sctp
+      --enable-dynamic-ssl-lib
+      --with-ssl=#{Formula["openssl"].opt_prefix}
+      --enable-shared-zlib
+      --enable-smp-support
+    ]
+
+    args << "--enable-darwin-64bit" if MacOS.prefer_64_bit?
+    args << "--enable-native-libs" if build.with? "native-libs"
+    args << "--enable-dirty-schedulers" if build.with? "dirty-schedulers"
+    args << "--enable-wx" if build.with? "wxmac"
+    args << "--with-dynamic-trace=dtrace" if MacOS::CLT.installed?
+
+    if build.without? "hipe"
+      # HIPE doesn't strike me as that reliable on macOS
+      # https://syntatic.wordpress.com/2008/06/12/macports-erlang-bus-error-due-to-mac-os-x-1053-update/
+      # https://www.erlang.org/pipermail/erlang-patches/2008-September/000293.html
+      args << "--disable-hipe"
+    else
+      args << "--enable-hipe"
+    end
+
+    if build.with? "java"
+      args << "--with-javac"
+    else
+      args << "--without-javac"
+    end
+
+    system "./configure", *args
+    system "make"
+    system "make", "install"
+
+    if build.with? "docs"
+      (lib/"erlang").install resource("man").files("man")
+      doc.install resource("html")
+    end
+  end
+
+  def caveats; <<~EOS
+    Man pages can be found in:
+      #{opt_lib}/erlang/man
+
+    Access them with `erl -man`, or add this directory to MANPATH.
+  EOS
+  end
+
+  test do
+    system "#{bin}/erl", "-noshell", "-eval", "crypto:start().", "-s", "init", "stop"
+  end
+end