homebrew-core/Formula/ghc.rb

require "language/haskell"

class Ghc < Formula
  include Language::Haskell::Cabal

  desc "Glorious Glasgow Haskell Compilation System"
  homepage "https://haskell.org/ghc/"
  url "https://downloads.haskell.org/~ghc/8.10.1/ghc-8.10.1-src.tar.xz"
  sha256 "4e3b07f83a266b3198310f19f71e371ebce97c769b14f0d688f4cbf2a2a1edf5"
  license "BSD-3-Clause"
  revision 1

  livecheck do
    url :stable
  end

  bottle do
    sha256 "a7bb4f707d08e220f4c94a48eebb142c59061eef0bb059cd01bed8d4aed7a775" => :catalina
    sha256 "f37c3a131aa50e5a60ec3377ae3fabcfeb1e6b5aa9596061c4f264b586dde49a" => :mojave
    sha256 "2a46799075c511b890069be59323d711791767922267bf71ac0eeac36ca6cebc" => :high_sierra
  end

  head do
    url "https://gitlab.haskell.org/ghc/ghc.git", branch: "ghc-8.10"

    depends_on "autoconf" => :build
    depends_on "automake" => :build
    depends_on "libtool" => :build

    resource "cabal" do
      url "https://hackage.haskell.org/package/cabal-install-3.0.0.0/cabal-install-3.0.0.0.tar.gz"
      sha256 "a432a7853afe96c0fd80f434bd80274601331d8c46b628cd19a0d8e96212aaf1"
    end
  end

  depends_on "python@3.8" => :build
  depends_on "sphinx-doc" => :build

  resource "gmp" do
    url "https://ftp.gnu.org/gnu/gmp/gmp-6.1.2.tar.xz"
    mirror "https://gmplib.org/download/gmp/gmp-6.1.2.tar.xz"
    mirror "https://ftpmirror.gnu.org/gmp/gmp-6.1.2.tar.xz"
    sha256 "87b565e89a9a684fe4ebeeddb8399dce2599f9c9049854ca8c0dfbdea0e21912"
  end

  # https://www.haskell.org/ghc/download_ghc_8_10_1.html#macosx_x86_64
  # "This is a distribution for Mac OS X, 10.7 or later."
  # A binary of ghc is needed to bootstrap ghc
  resource "binary" do
    on_macos do
      url "https://downloads.haskell.org/~ghc/8.10.1/ghc-8.10.1-x86_64-apple-darwin.tar.xz"
      sha256 "65b1ca361093de4804a7e40b3e68178e1ef720f84f743641ec8d95e56a45b3a8"
    end

    on_linux do
      url "https://downloads.haskell.org/~ghc/8.10.1/ghc-8.10.1-x86_64-deb9-linux.tar.xz"
      sha256 "d1cf7886f27af070f3b7dbe1975a78b43ef2d32b86362cbe953e79464fe70761"
    end
  end

  def install
    # Work around Xcode 11 clang bug
    # https://bitbucket.org/multicoreware/x265/issues/514/wrong-code-generated-on-macos-1015
    ENV.append_to_cflags "-fno-stack-check" if DevelopmentTools.clang_build_version >= 1010

    ENV["CC"] = ENV.cc
    ENV["LD"] = "ld"
    ENV["PYTHON"] = Formula["python@3.8"].opt_bin/"python3"

    # Build a static gmp rather than in-tree gmp, otherwise all ghc-compiled
    # executables link to Homebrew's GMP.
    gmp = libexec/"integer-gmp"

    # GMP *does not* use PIC by default without shared libs so --with-pic
    # is mandatory or else you'll get "illegal text relocs" errors.
    resource("gmp").stage do
      system "./configure", "--prefix=#{gmp}", "--with-pic", "--disable-shared",
                            "--build=#{Hardware.oldest_cpu}-apple-darwin#{`uname -r`.to_i}"
      system "make"
      system "make", "install"
    end

    args = ["--with-gmp-includes=#{gmp}/include",
            "--with-gmp-libraries=#{gmp}/lib"]

    # As of Xcode 7.3 (and the corresponding CLT) `nm` is a symlink to `llvm-nm`
    # and the old `nm` is renamed `nm-classic`. Building with the new `nm`, a
    # segfault occurs with the following error:
    #   make[1]: * [compiler/stage2/dll-split.stamp] Segmentation fault: 11
    # Upstream is aware of the issue and is recommending the use of nm-classic
    # until Apple restores POSIX compliance:
    # https://ghc.haskell.org/trac/ghc/ticket/11744
    # https://ghc.haskell.org/trac/ghc/ticket/11823
    # https://mail.haskell.org/pipermail/ghc-devs/2016-April/011862.html
    # LLVM itself has already fixed the bug: llvm-mirror/llvm@ae7cf585
    # rdar://25311883 and rdar://25299678
    if DevelopmentTools.clang_build_version >= 703 && DevelopmentTools.clang_build_version < 800
      args << "--with-nm=#{`xcrun --find nm-classic`.chomp}"
    end

    resource("binary").stage do
      binary = buildpath/"binary"

      system "./configure", "--prefix=#{binary}", *args
      ENV.deparallelize { system "make", "install" }

      ENV.prepend_path "PATH", binary/"bin"
    end

    if build.head?
      resource("cabal").stage do
        system "sh", "bootstrap.sh", "--sandbox"
        (buildpath/"bootstrap-tools/bin").install ".cabal-sandbox/bin/cabal"
      end

      ENV.prepend_path "PATH", buildpath/"bootstrap-tools/bin"

      cabal_sandbox do
        cabal_install "--only-dependencies", "happy", "alex"
        cabal_install "--prefix=#{buildpath}/bootstrap-tools", "happy", "alex"
      end

      system "./boot"
    end

    system "./configure", "--prefix=#{prefix}", *args
    system "make"

    ENV.deparallelize { system "make", "install" }
    Dir.glob(lib/"*/package.conf.d/package.cache") { |f| rm f }
    Dir.glob(lib/"*/package.conf.d/package.cache.lock") { |f| rm f }
  end

  def post_install
    system "#{bin}/ghc-pkg", "recache"
  end

  test do
    (testpath/"hello.hs").write('main = putStrLn "Hello Homebrew"')
    assert_match "Hello Homebrew", shell_output("#{bin}/runghc hello.hs")
  end
end