Google gn简明教程

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Google gn简明教程

2023-07-11 04:33| 来源: 网络整理| 查看: 265

https://gn.googlesource.com/gn/

generates build files for Ninja.

重要文件

.gn : Defines root of GN build tree

共享的变量放在gni文件中，通过 import导入

查有哪些targets

1 2 gn ls out/Default “//base/*” 查看可用参数列表及其默认值

gn args --list out/my_build > args_list.log，生成的log不在my_build目录，在运行命令的目录，应该是src下, 需要先运行gn args out/my_build

https://gn.googlesource.com/gn/+/main/docs/quick_start.md 备份https://elesos.github.io/2021/07/04/docs/gn/quick_start/

先下载示例代码

git clone https://gn.googlesource.com/gn

我的在 https://github.com/elesos/gn

要运行gn，需要先安装depot_tools

安装depot_tools

A collection of tools for dealing with Chromium development.

Chromium and Chromium OS use a package of scripts called depot_tools to manage checkouts and code reviews. The depot_tools package includes gclient, gcl, git-cl, repo, and others.

https://dev.chromium.org/developers/how-tos/install-depot-tools

https://commondatastorage.googleapis.com/chrome-infra-docs/flat/depot_tools/docs/html/depot_tools_tutorial.html

https://www.chromium.org/developers/how-tos/depottools

首先Confirm git and python are installed.

LINUX / MAC 1 2 git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git 或 https://github.com/elesos/depot_tools使用里面的 depot_tools.tar.bz2

Add depot_tools to your PATH:

1 export PATH=/path/to/depot_tools:$PATH //put depot_tools ahead of everything else放在最前面 windows

使用里面的压缩包depot_tools.zip https://github.com/elesos/depot_tools

From a cmd.exe shell, run the command gclient (without arguments). On first run, gclient will install all the Windows-specific bits needed to work with the code, including msysgit and python.

DEPS file

A DEPS file specifies dependencies of a project.

交叉编译

target_os = “android”

target_cpu = “arm”

target_cpu = “x86”

target_cpu = “x64”

入门

根目录下有.gn 这个文件所在目录为根目录，这个文件里面可能会指定A master build config file. 如Chrome’s is //build/config/BUILDCONFIG.gn

子模块目录新建BUILD.gn

根目录也有这个BUILD.gn(GN starts by loading this root file)

创建一个静态库

tools/gn/tutorial/BUILD.gn

static_library(“hello”) { sources = [ “hello.cc”, ] }

现在让我们添加一个依赖于这个库的可执行文件：

executable(“say_hello”) { sources = [ “say_hello.cc”, ] deps = [ “:hello”, ] }

也可以用全部的//tools/gn/tutorial:hello 同一个文件中可以直接用:hello

ninja -C out/Default say_hello

Create a tools/gn/tutorial/BUILD.gn file

1 2 executable("hello_world") { sources = [ "hello_world.cc", ] }

然后在根目录，BUILD.gn file

1 2 3 group("root") { deps = [ ... "//url", "//tools/gn/tutorial:hello_world", ] }

“//” (代表 source root)，冒号后面是 target name

在根目录下

gn gen out/Default

ninja -C out/Default hello_world

或

ninja -C out/Default tools/gn/tutorial:hello_world 不要前面的//符号

标签含义 1 2 3 4 5 6 7 8 //chrome/browser:version → Looks for “version” in chrome/browser/BUILD.gn //base → Shorthand for //base:base In current file当前文件里面的，只需要在前面加冒号 :baz

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Google gn简明教程

Google gn简明教程

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