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