class AppleGcc42 < Formula
  desc "GNU compiler collection"
  homepage "https://r.research.att.com/tools/"
  url "https://r.research.att.com/tools/gcc-42-5666.3-darwin11.pkg"
  mirror "https://web.archive.org/web/20130512150329/https://r.research.att.com/tools/gcc-42-5666.3-darwin11.pkg"
  version "4.2.1-5666.3"
  sha256 "2f3893b411f578bfa98a99646ecfea0ba14e1bff4e4f311d7e595936d0da065d"

  bottle :unneeded

  option "with-gfortran-symlink", "Provide gfortran symlinks"

  depends_on MaximumMacOSRequirement => :mavericks

  def install
    system "/bin/pax", "--insecure", "-rz", "-f", "usr.pkg/Payload", "-s", ",./usr,#{prefix},"

    if build.with? "gfortran-symlink"
      bin.install_symlink "gfortran-4.2" => "gfortran"
      man1.install_symlink "gfortran-4.2.1" => "gfortran.1"
    end
  end

  def caveats
    <<~EOS
      NOTE:
      This formula provides components that were removed from XCode in the 4.2
      release. There is no reason to install this formula if you are using a
      version of XCode prior to 4.2.

      This formula contains compilers built from Apple's GCC sources, build
      5666.3, available from:

        https://opensource.apple.com/tarballs/gcc

      All compilers have a `-4.2` suffix. A GFortran compiler is also included.
    EOS
  end

  test do
    (testpath/"hello-c.c").write <<~EOS
      #include <stdio.h>
      int main()
      {
        puts("Hello, world!");
        return 0;
      }
    EOS
    system "#{bin}/gcc-4.2", "-o", "hello-c", "hello-c.c"
    assert_equal "Hello, world!\n", `./hello-c`

    (testpath/"hello-cc.cc").write <<~EOS
      #include <iostream>
      int main()
      {
        std::cout << "Hello, world!" << std::endl;
        return 0;
      }
    EOS
    system "#{bin}/g++-4.2", "-o", "hello-cc", "hello-cc.cc"
    assert_equal "Hello, world!\n", `./hello-cc`

    fixture = <<~EOS
      integer,parameter::m=10000
      real::a(m), b(m)
      real::fact=0.5

      do concurrent (i=1:m)
        a(i) = a(i) + fact*b(i)
      end do
      print *, "done"
      end
    EOS
    (testpath/"in.f90").write(fixture)
    system "#{bin}/gfortran", "-c", "in.f90"
    system "#{bin}/gfortran", "-o", "test", "in.o"
    assert_equal "done", `./test`.strip
  end
end