| // Copyright 2015 Google Inc. All rights reserved. |
| // |
| // 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. |
| |
| // Soong is a builder for Android that uses Blueprint to parse Blueprints |
| // files and Ninja to do the dependency tracking and subprocess management. |
| // Soong itself is responsible for converting the modules read by Blueprint |
| // into build rules, which will be written to a build.ninja file by Blueprint. |
| // |
| // Android build concepts: |
| // |
| // Device |
| // A device is a piece of hardware that will be running Android. It may specify |
| // global settings like architecture, filesystem configuration, initialization |
| // scripts, and device drivers. A device may support all variants of a single |
| // piece of hardware, or multiple devices may be used for different variants. |
| // A build is never targeted directly at a device, it is always targeted at a |
| // "product". |
| // |
| // Product |
| // A product is a configuration of a device, often for a specific market or |
| // use case. It is sometimes referred to as a "SKU". A product defines |
| // global settings like supported languages, supported use cases, preinstalled |
| // modules, and user-visible behavior choices. A product selects one and only |
| // one device. |
| // |
| // Module |
| // A module is a definition of something to be built. It may be a C library or |
| // binary, a java library, an Android app, etc. A module may be built for multiple |
| // targets, even in a single build, for example host and device, or 32-bit device |
| // and 64-bit device. |
| // |
| // Installed module |
| // An installed module is one that has been requested by the selected product, |
| // or a dependency of an installed module. |
| // |
| // Target architecture |
| // The target architecture is the preferred architecture supported by the selected |
| // device. It is most commonly 32-bit arm, but may also be 64-bit arm, 32-bit |
| // x86, or 64-bit x86. |
| // |
| // Secondary architecture |
| // The secondary architecture specifies the architecture to compile a second copy |
| // of some modules for devices that support multiple architectures, for example |
| // 64-bit devices that also support 32-bit binaries. |
| package soong |