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47 lines
1.8 KiB
Markdown
47 lines
1.8 KiB
Markdown
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# What is GN?
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GN is a meta-build system that generates [Ninja](https://ninja-build.org)
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build files so that you can build Chromium with Ninja.
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## Why did you switch from GYP?
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1. We believe GN files are more readable and more maintainable than GYP files.
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2. GN is fast:
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* GN is 20x faster than GYP.
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* GN supports automatically re-running itself as needed by Ninja
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as part of the build. This eliminates the need to remember to
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re-run GN when you change a build file.
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3. GN gives us better tools for enforcing dependencies (see
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`gn check` and the `visibility`, `public_deps`, and `data_deps`
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options for some examples).
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4. GN gives us tools for querying the build graph; you can ask
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"what does X depend on" and "who depends on Y", for example.
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## What's the status of the GYP->GN migration for Chromium?
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_As of Oct 2016:_
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* All of the Chromium builds have been switched over.
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* Nearly all of the GYP files have been deleted from the Chromium repos.
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* You can no longer build with GYP as a result.
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* There are still some GYP files in place for the "Closure Compilation"
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builders that need to be converted over.
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* Some related projects (e.g., V8, Skia) may still support GYP for their
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own reasons.
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* We're still cleaning up some odds and ends like making gclient not
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still use GYP_DEFINES.
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## I want more info on GN!
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Read these links:
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* [Quick start](docs/quick_start.md)
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* [FAQ](docs/faq.md)
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* [Language and operation details](docs/language.md)
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* [Reference](docs/reference.md): The built-in `gn help` documentation.
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* [Style guide](docs/style_guide.md)
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* [Cross compiling and toolchains](docs/cross_compiles.md)
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* [Hacking on GN itself](docs/hacking.md)
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* [Standaline GN projects](docs/standalone.md)
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* [Pushing new binaries](docs/update_binaries.md)
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