Android: Add Android.bp files for a host build.

This makes it possible to build swiftshader for the host.

The target build also works but it has been disabled.

Change-Id: I8aecf931f4ebf72c06d4e3423e2eafea6bfa7f6c
Reviewed-on: https://swiftshader-review.googlesource.com/17988
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Alistair Strachan <astrachan@google.com>
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..f8c596f
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,108 @@
+//
+// Copyright (C) 2018 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+cc_defaults {
+    name: "swiftshader_common",
+
+    gnu_extensions: false,
+
+    cflags: [
+        "-Xclang", "-fuse-init-array",
+        "-fno-operator-names",
+        "-msse2",
+        "-Werror",
+        "-Wwrite-strings",
+    ],
+
+    cppflags: [
+        "-Woverloaded-virtual",
+    ],
+
+    target: {
+        host: {
+            cppflags: [
+                "-fno-rtti",
+                "-fno-exceptions",
+            ],
+            compile_multilib: "64",
+        },
+
+        // We don't need Darwin host-side builds
+        darwin: {
+            enabled: false,
+        },
+    },
+}
+
+cc_defaults {
+    name: "swiftshader_common_release",
+
+    defaults: [ "swiftshader_common" ],
+
+    cflags: [
+        "-Os",
+        "-fomit-frame-pointer",
+        "-ffunction-sections",
+        "-fdata-sections",
+    ],
+}
+
+cc_defaults {
+    name: "swiftshader_common_debug",
+
+    defaults: [ "swiftshader_common" ],
+
+    cflags: [
+        "-O0",
+        "-g",
+        "-UNDEBUG",
+    ],
+}
+
+cc_defaults {
+    name: "swiftshader_subzero",
+
+    cflags: [
+        "-DALLOW_DUMP=0",
+        "-DALLOW_TIMERS=0",
+        "-DALLOW_LLVM_CL=0",
+        "-DALLOW_LLVM_IR=0",
+        "-DALLOW_LLVM_IR_AS_INPUT=0",
+        "-DALLOW_MINIMAL_BUILD=0",
+        "-DALLOW_WASM=0",
+        "-DICE_THREAD_LOCAL_HACK=1",
+    ],
+}
+
+cc_library_headers {
+    name: "swiftshader_platform_headers",
+    host_supported: true,
+    export_include_dirs: ["include"],
+}
+
+cc_library_headers {
+    name: "swiftshader_host_headers",
+    device_supported: false,
+    host_supported: true,
+    export_include_dirs: ["include/Android"],
+}
+
+subdirs = [
+    "src",
+    "third_party/llvm-subzero",
+    "third_party/LLVM",
+    "third_party/subzero",
+]