add back at 1.6 (#31)

Formula/risingwave@1.6.rb

@@ -0,0 +1,59 @@
+class RisingwaveAT16 < Formula
+  desc "Distributed SQL database for stream processing"
+  homepage "https://github.com/risingwavelabs/risingwave"
+  url "https://github.com/risingwavelabs/risingwave/archive/refs/tags/v1.6.1.tar.gz"
+  sha256 "7a06fed4eb480572c16718c2c15f0938ad3a29e1bea15a568d673dcd02c428de"
+  license "Apache-2.0"
+  head "https://github.com/risingwavelabs/risingwave.git", branch: "main"
+
+  bottle do
+    root_url "https://github.com/risingwavelabs/homebrew-risingwave/releases/download/risingwave-1.6.1"
+    sha256 cellar: :any, arm64_ventura: "e6a85ee7b13bdf392be2c061b1ed635520c482583e440d6207ac51fae3206419"
+    sha256 cellar: :any, ventura:       "80e09d56079de6d8b67d3f90e4ffa349fec40c114970f16d9d3da5423a6e9482"
+    sha256 cellar: :any, monterey:      "e266368acc1eee8bc141e0638fb0a939af8779e24eaf1b346b95912e28d5e362"
+  end
+
+  depends_on "cmake" => :build
+  depends_on "protobuf" => :build
+  depends_on "rustup-init" => :build
+  depends_on "openssl@3"
+  depends_on "xz"
+
+  def install
+    # this will install the necessary cargo/rustup toolchain bits in HOMEBREW_CACHE
+    system "#{Formula["rustup-init"].bin}/rustup-init",
+           "-qy", "--no-modify-path",
+           "--default-toolchain", "none"
+    ENV.prepend_path "PATH", HOMEBREW_CACHE/"cargo_cache/bin"
+
+    # Remove `RUSTFLAGS` env var set by Homebrew, or it will override the one specified
+    # in `.cargo/config.toml`.
+    #
+    # https://github.com/Homebrew/brew/pull/15544#issuecomment-1628639703
+    ENV.delete "RUSTFLAGS"
+
+    # Homebrew changes cxx flags, and CMake doesn't pick them up, so rdkafka-sys build fails.
+    # We cannot pass CMake flags (`std_cmake_args`) because it's in their build.rs.
+    #
+    # Some refs that might be useful:
+    # https://github.com/Homebrew/homebrew-core/pull/51949#issuecomment-601943075
+    # https://github.com/Homebrew/brew/pull/7134
+    ENV["SDKROOT"] = MacOS.sdk_path_if_needed
+
+    # Remove `"-Clink-arg=xxx/ld64.lld"` to avoid dependency on LLVM.
+    # If we `depends_on "llvm" => :build`, it will somehow corrupt the resolution of the C++
+    # compiler when building `cxx` crate. Didn't investigate further.
+    inreplace ".cargo/config.toml" do |s|
+      s.gsub!(/"-Clink-arg=.*ld64.lld",?/, "")
+    end
+
+    system "cargo", "install",
+           "--bin", "risingwave",
+           "--features", "rw-static-link",
+           *std_cargo_args(path: "src/cmd_all") # "--locked", "--root ...", "--path src/cmd_all"
+  end
+
+  test do
+    system "#{bin}/risingwave", "--help"
+  end
+end