ghc@9 9.0.1 (new formula)

This does not have a gmp resource. It is no longer needed. [1]

[1] https://gitlab.haskell.org/ghc/ghc/-/wikis/migration/9.0#integer-gmp-11-integer-simple-ghc-bignum-10

Formula/ghc@9.rb

@@ -0,0 +1,63 @@
+class GhcAT9 < Formula
+  desc "Glorious Glasgow Haskell Compilation System"
+  homepage "https://haskell.org/ghc/"
+  url "https://downloads.haskell.org/~ghc/9.0.1/ghc-9.0.1-src.tar.xz"
+  sha256 "a5230314e4065f9fcc371dfe519748fd85c825b279abf72a24e09b83578a35f9"
+  license "BSD-3-Clause"
+
+  livecheck do
+    url "https://www.haskell.org/ghc/download.html"
+    regex(/href=.*?download[._-]ghc[._-][^"' >]+?\.html[^>]*?>\s*?v?(\d+(?:\.\d+)+)\s*?</i)
+  end
+
+  keg_only :versioned_formula
+
+  depends_on "[email protected]" => :build
+  depends_on "sphinx-doc" => :build
+
+  # https://www.haskell.org/ghc/download_ghc_9_0_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/9.0.1/ghc-9.0.1-x86_64-apple-darwin.tar.xz"
+      sha256 "122d60509147d0117779d275f0215bde2ff63a64cda9d88f149432d0cae71b22"
+    end
+
+    on_linux do
+      url "https://downloads.haskell.org/~ghc/8.10.3/ghc-9.0.1-x86_64-deb9-linux.tar.xz"
+      sha256 "4ca6252492f59fe589029fadca4b6f922d6a9f0ff39d19a2bd9886fde4e183d5"
+    end
+  end
+
+  def install
+    ENV["CC"] = ENV.cc
+    ENV["LD"] = "ld"
+    ENV["PYTHON"] = Formula["[email protected]"].opt_bin/"python3"
+
+    resource("binary").stage do
+      binary = buildpath/"binary"
+
+      system "./configure", "--prefix=#{binary}"
+      ENV.deparallelize { system "make", "install" }
+
+      ENV.prepend_path "PATH", binary/"bin"
+    end
+
+    system "./configure", "--prefix=#{prefix}"
+    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

style_exceptions/binary_bootstrap_formula_urls_allowlist.json

@@ -5,6 +5,7 @@
   "ghc",
   "[email protected]",
   "[email protected]",
+  "ghc@9",
   "go",
   "[email protected]",
   "[email protected]",