mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 14:26:09 +03:00
45 lines
2.0 KiB
Markdown
45 lines
2.0 KiB
Markdown
|
# Introduction
|
||
|
|
|
||
|
|
This page is about how to design a project that can build independently
|
||
|
|
with GN but also be brought into the Chrome build.
|
||
|
|
|
||
|
|
GN is in principle no different than GYP in that there is some core
|
||
|
|
configuration that must be the same between both the standalone build
|
||
|
|
and the Chrome build. However, GN is much more explicit in its naming
|
||
|
|
and configuration, so the similarities between the two builds are also
|
||
|
|
much more explicit and there is less flexibility in how things are
|
||
|
|
configured.
|
||
|
|
|
||
|
|
# What you need for a minimal GN build
|
||
|
|
|
||
|
|
Requirements:
|
||
|
|
|
||
|
|
* A master build config file. Chrome's is `//build/config/BUILDCONFIG.gn`
|
||
|
|
* A separate build file for the toolchain definition. It's not a good idea
|
||
|
|
to put these in a BUILD.gn file shared with any target definitions for
|
||
|
|
complex reasons. Chrome's are in `//build/toolchain/<platform>/BUILD.gn`.
|
||
|
|
* A `BUILD.gn` file in the root directory. This will be loaded after the
|
||
|
|
build config file to start the build.
|
||
|
|
|
||
|
|
You may want a `.gn` file in the root directory. When you run GN it
|
||
|
|
recursively looks up the directory tree until it finds this file, and it
|
||
|
|
treats the containing directory as the "source root". This file also
|
||
|
|
defines the location of the master build config file:
|
||
|
|
|
||
|
|
* See Chrome's `src/.gn` file.
|
||
|
|
* Unlike Chrome, you probably don't need to define a secondary root.
|
||
|
|
* see `gn help dotfile` for more.
|
||
|
|
|
||
|
|
Adding a `.gn` file in a repository that is pulled into Chrome means
|
||
|
|
that then running GN in your subdirectory will configure a build for
|
||
|
|
your subproject rather than for all of Chrome. This could be an
|
||
|
|
advantage or a disadvantage.
|
||
|
|
|
||
|
|
If you are in a directory with such a file and you want to not use it
|
||
|
|
(e.g., to do the full Chrome build instead), you can use the command-line
|
||
|
|
flags `--root` and `--dotfile` to set the values you want.
|
||
|
|
|
||
|
|
If you want a completely standalone build that has nothing to do with Chrome
|
||
|
|
and doesn't use Chrome's `//build` files, you can look at an example in
|
||
|
|
[//tools/gn/example](../tools/gn/example).
|