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57 lines
2.5 KiB
57 lines
2.5 KiB
4 months ago
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// Copyright 2015 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Soong is a builder for Android that uses Blueprint to parse Blueprints
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// files and Ninja to do the dependency tracking and subprocess management.
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// Soong itself is responsible for converting the modules read by Blueprint
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// into build rules, which will be written to a build.ninja file by Blueprint.
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//
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// Android build concepts:
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//
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// Device
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// A device is a piece of hardware that will be running Android. It may specify
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// global settings like architecture, filesystem configuration, initialization
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// scripts, and device drivers. A device may support all variants of a single
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// piece of hardware, or multiple devices may be used for different variants.
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// A build is never targeted directly at a device, it is always targeted at a
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// "product".
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//
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// Product
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// A product is a configuration of a device, often for a specific market or
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// use case. It is sometimes referred to as a "SKU". A product defines
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// global settings like supported languages, supported use cases, preinstalled
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// modules, and user-visible behavior choices. A product selects one and only
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// one device.
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//
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// Module
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// A module is a definition of something to be built. It may be a C library or
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// binary, a java library, an Android app, etc. A module may be built for multiple
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// targets, even in a single build, for example host and device, or 32-bit device
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// and 64-bit device.
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//
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// Installed module
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// An installed module is one that has been requested by the selected product,
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// or a dependency of an installed module.
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//
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// Target architecture
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// The target architecture is the preferred architecture supported by the selected
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// device. It is most commonly 32-bit arm, but may also be 64-bit arm, 32-bit
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// x86, or 64-bit x86.
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//
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// Secondary architecture
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// The secondary architecture specifies the architecture to compile a second copy
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// of some modules for devices that support multiple architectures, for example
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// 64-bit devices that also support 32-bit binaries.
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package soong
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