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[fuchsia] Update fuchsia instruction in Compiling-the-engine.md #55365

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[fuchsia] Update fuchsia instruction in Compiling-the-engine.md #55365

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Update fuchsia instruction in Compiling-the-engine.md
zijiehe-google-com Sep 23, 2024
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Update Compiling-the-engine.md
zijiehe-google-com Sep 23, 2024
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Merge branch 'main' into zijiehe-google-com-fuchsia-instruction
zijiehe-google-com Sep 23, 2024
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30 changes: 22 additions & 8 deletions docs/contributing/Compiling-the-engine.md
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Expand Up @@ -200,18 +200,28 @@ Also, be sure that Python27 is before any other python in your Path.

### Build components for Fuchsia

1. Building fuchsia is only supported on linux. You need to run `gclient config --custom-var=download_fuchsia_deps=True` then `gclient sync`.
1. Building fuchsia is only supported on linux. You need to update `engine/.gclient`, or `../.gclient` if current directory is `engine/src`, with `custom_vars`.

It will set `"download_fuchsia_deps": True` in `"custom_vars"` section in `.gclient` file, and download necessary binaries to build fuchsia components.
```
solutions = [
{
# ...
"custom_vars": {
"download_fuchsia_deps": True,
"run_fuchsia_emu": True,
},
},
]
```

2. If you'd like to run tests locally, also run `gclient config --custom-var=run_fuchsia_emu=True` then `gclient sync`.
> You may ignore `"run_fuchsia_emu": True` if you won't run tests locally.

It will set `"run_fuchsia_emu": True` in `"custom_vars"` section in `.gclient` file, and download necessary binaries and images to run tests on fuchsia emulators.
You can set both `custom_vars` and run `gclient sync` only once.
Run `gclient sync`.

You will also need kvm enabled, or nested virtualization on the gcloud VMs. Fuchsia and the tests will all be executed on the qemu.
> [!WARNING]
> When running tests locally, you will also need kvm enabled, or nested virtualization on the gcloud VMs. Fuchsia and the tests will all be executed on the qemu.

3. Prepare and build
2. Prepare and build

```
./flutter/tools/gn --fuchsia --no-lto
Expand All @@ -238,7 +248,7 @@ fuchsia_tests
* Use `autoninja` if it's available.
* `-C out/fuchsia_release_x64` for release build; other configurations are similar with a different folder name in `out/`.

4. Run all tests locally
3. Run all tests locally

```
python3 flutter/tools/fuchsia/with_envs.py flutter/testing/fuchsia/run_tests.py
Expand All @@ -247,6 +257,10 @@ python3 flutter/tools/fuchsia/with_envs.py flutter/testing/fuchsia/run_tests.py
* It runs the tests in `out/fuchsia_debug_x64` by default. According to the configuration, it may take 5 minutes with regular gtest output to the terminal.
* Add `fuchsia_release_x64` at the end of the command for release build; other configurations are similar with a different folder name in `out/`.

```
python3 flutter/tools/fuchsia/with_envs.py flutter/testing/fuchsia/run_tests.py fuchsia_release_x64
```

## Compiling for the Web

For building the engine for the Web we use the [felt](https://github.com/flutter/engine/blob/main/lib/web_ui/README.md) tool.
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