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Meta: Explain how to build with ninja

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Inspired by #3047, and my struggles to understand how cmake is supposed to work ^^

Thanks to @bgianfo, who made me realize that ninja can be used just like make.
No idea why I didn't notice that earlier.
This commit is contained in:
Ben Wiederhake 2020-08-12 02:29:38 +02:00 committed by Andreas Kling
parent 8c7b5fb97b
commit 1176865276
Notes: sideshowbarker 2024-07-19 03:28:06 +09:00 
Author: https://github.com/BenWiederhake
Commit: https://github.com/SerenityOS/serenity/commit/11768652769
Pull-request: https://github.com/SerenityOS/serenity/pull/3098
Reviewed-by: https://github.com/bgianfo
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Documentation/BuildInstructions.md
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@ -107,7 +107,18 @@ Outside of QEMU, Serenity will run on VirtualBox. If you're curious, see how to
Later on, when you `git pull` to get the latest changes, there's no need to rebuild the toolchain. You can simply run `make install`, `make image`, `make run` again. CMake will only rebuild those parts that have been updated.
You may also want to replace `make` with `ninja` in the above commands for some additional build speed benefits. To do this, go to an empty directory at the root and call `cmake .. -G Ninja` inside that directory. You might either create a new directory or reuse the existing `Build` directory after cleaning it.
#### Faster than make: "Ninja"
You may also want to replace `make` with `ninja` in the above commands for some additional build speed benefits, like reduced double-building of headers.
Most of the process stays the same:
- Go to an empty directory at the root (e.g. `Build/`) and call `cmake .. -G Ninja` inside that directory
- You might either create a new directory or reuse the existing `Build` directory after cleaning it.
- `make` becomes `ninja`
- `make install` becomes `ninja install`
- `make image` becomes `ninja image`
- `make run` becomes `ninja run`
Note that ninja automatically chooses a sane value for `-j` automatically, and if something goes wrong it will print the full compiler invocation. Otherwise, `ninja` behaves just like `make`. (And is a tad faster.)
#### Ports
To add a package from the ports collection to Serenity, for example curl, go into `Ports/curl/` and run **./package.sh**. The sourcecode for the package will be downloaded and the package will be built. After that, run **make image** from the `Build/` directory to update the disk image. The next time you start Serenity with **make run**, `curl` will be available.