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Notes on how to build SKQP for Fuchsia.

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Change-Id: I85477806b151773bc715f31bcdb05554107cc6b4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/257700
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
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John Rosasco 2019-12-03 11:18:02 -08:00 committed by Skia Commit-Bot
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build/fuchsia/skqp/README.md
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# CIPD Package Creation and Upload Procedure
# Building SKQP for Fuchsia
Using an arm64 device as an example, to build skqp for Fuchsia:
```
gn gen out/fuchsia-arm64 --args="is_official_build=false is_debug=false skia_update_fuchsia_sdk=true target_cpu=\"arm64\" target_os=\"fuchsia\" using_fuchsia_sdk=true skia_tools_require_resources=true skia_skqp_global_error_tolerance=8"
```
The effect of `skia_update_fuchsia_sdk=true` is that it will download both the Fuchsia SDK and a compatible clang for building SKQP as part of the `gn gen ...` step above.
Next step, compile skqp for Fuchsia:
```
autoninja -C out/fuchsia-arm64 ":skqp_repo"
```
The effect of this build will be to produce a Fuchsia package repository named `skqp_repo` in the `out` directory of the build. `skqp_repo` can then be served to a Fuchsia device using `//fuchsia/sdk/tools/pm serve -repo skqp_repo` (where // is the skia build root).
See [install fuchsia packages](https://fuchsia.dev/fuchsia-src/development/sdk/documentation/packages#install-package) for more on serving packages to Fuchsia devices.
# Fuchsia CIPD Package Creation and Upload Procedure
These steps assume the creation of the arm64 CIPD package as an example. Because the package requires a path from the output directory of the build, the `gn gen` arguments must match the prescribed path declared in `cipd_arm64.yaml` in order for this CIPD package creation and upload to succeed.
## Create CIPD Package