91 lines
2.3 KiB
Markdown
91 lines
2.3 KiB
Markdown
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# Building Dawn
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## System requirements
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* Git
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* CMake (3.10.2 or later) (if desired)
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* GN (if desired)
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* Ninja (or other build tool)
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* Python, for fetching dependencies
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* [depot_tools] in your path
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- Linux
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- The `pkg-config` command:
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```sh
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# Install pkg-config on Ubuntu
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sudo apt-get install pkg-config
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```
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- Mac
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- [Xcode](https://developer.apple.com/xcode/) 12.2+.
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- The macOS 11.0 SDK. Run `xcode-select` to check whether you have it.
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```sh
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ls `xcode-select -p`/Platforms/MacOSX.platform/Developer/SDKs
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```
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## Install `depot_tools`
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Dawn uses the Chromium build system and dependency management so you need to [install depot_tools] and add it to the PATH.
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[install depot_tools]: http://commondatastorage.googleapis.com/chrome-infra-docs/flat/depot_tools/docs/html/depot_tools_tutorial.html#_setting_up
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## Get the code
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```sh
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# Clone the repo as "dawn"
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git clone https://dawn.googlesource.com/dawn dawn && cd dawn
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# Bootstrap the gclient configuration
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cp scripts/standalone.gclient .gclient
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# Fetch external dependencies and toolchains with gclient
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gclient sync
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```
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## Build Dawn
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### Compiling using CMake + Ninja
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```sh
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mkdir -p out/Debug
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cd out/Debug
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cmake -GNinja ../..
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ninja # or autoninja
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```
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### Compiling using CMake + make
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```sh
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mkdir -p out/Debug
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cd out/Debug
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cmake ../..
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make # -j N for N-way parallel build
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```
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### Compiling using gn + ninja
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```sh
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mkdir -p out/Debug
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gn gen out/Debug
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autoninja -C out/Debug
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```
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The most common GN build option is `is_debug=true/false`; otherwise
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`gn args out/Debug --list` shows all the possible options.
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On macOS you'll want to add the `use_system_xcode=true` in most cases.
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(and if you're a googler please get XCode from go/xcode).
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### Fuzzers on MacOS
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If you are attempting fuzz, using `TINT_BUILD_FUZZERS=ON`, the version of llvm
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in the XCode SDK does not have the needed libfuzzer functionality included.
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The build error that you will see from using the XCode SDK will look something
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like this:
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```
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ld: file not found:/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/11.0.0/lib/darwin/libclang_rt.fuzzer_osx.a
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```
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The solution to this problem is to use a full version llvm, like what you would
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get via homebrew, `brew install llvm`, and use something like `CC=<path to full
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clang> cmake ..` to setup a build using that toolchain.
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