pocl 3.0 (new formula)

Formula/pocl.rb

@@ -0,0 +1,52 @@
+class Pocl < Formula
+  desc "Portable Computing Language"
+  homepage "http://portablecl.org"
+  url "http://portablecl.org/downloads/pocl-3.0.tar.gz"
+  sha256 "a3fd3889ef7854b90b8e4c7899c5de48b7494bf770e39fba5ad268a5cbcc719d"
+  license "MIT"
+  head "https://github.com/pocl/pocl.git", branch: "master"
+
+  depends_on "cmake" => :build
+  depends_on "opencl-headers" => :build
+  depends_on "pkg-config" => :build
+  depends_on "hwloc"
+  depends_on "llvm"
+  depends_on "ocl-icd"
+
+  on_linux do
+    depends_on "gcc"
+  end
+
+  fails_with gcc: "5" # LLVM is built with GCC
+
+  def install
+    # Install the ICD into #{prefix}/etc rather than #{etc} as it contains the realpath
+    # to the shared library and needs to be kept up-to-date to work with an ICD loader.
+    # This relies on `brew link` automatically creating and updating #{etc} symlinks.
+    args = %W[
+      -DPOCL_INSTALL_ICD_VENDORDIR=#{prefix}/etc/OpenCL/vendors
+      -DCMAKE_INSTALL_RPATH=#{lib};#{lib}/pocl
+      -DENABLE_EXAMPLES=OFF
+      -DENABLE_TESTS=OFF
+      -DLLVM_BINDIR=#{Formula["llvm"].opt_bin}
+    ]
+    # Avoid installing another copy of OpenCL headers on macOS
+    args << "-DOPENCL_H=#{Formula["opencl-headers"].opt_include}/CL/opencl.h" if OS.mac?
+    # Only x86_64 supports "distro" which allows runtime detection of SSE/AVX
+    args << "-DKERNELLIB_HOST_CPU_VARIANTS=distro" if Hardware::CPU.intel?
+
+    system "cmake", "-S", ".", "-B", "build", *std_cmake_args, *args
+    system "cmake", "--build", "build"
+    system "cmake", "--install", "build"
+    (pkgshare/"examples").install "examples/poclcc"
+  end
+
+  test do
+    ENV["OCL_ICD_VENDORS"] = "pocl.icd" # Ignore any other ICD that may be installed
+    cp pkgshare/"examples/poclcc/poclcc.cl", testpath
+    system bin/"poclcc", "-o", "poclcc.cl.pocl", "poclcc.cl"
+    assert_predicate testpath/"poclcc.cl.pocl", :exist?
+    # Make sure that CMake found our OpenCL headers and didn't install a copy
+    refute_predicate include/"OpenCL", :exist?
+  end
+end