如果您不喜欢使用emsdk下载二进制文件，也可以 build Emscripten from source。
There are additional ways to install Emscripten than the instructions below, for example, using brew on MacOS, the package manager on your linux distro, or a Docker image, etc. However, the emsdk is the only officially supported way to use Emscripten that is supported by the Emscripten project, and the only one that we constantly test (emsdk CI, Emscripten GitHub CI, Chromium CI). (While we don’t officially support other ways of getting Emscripten, we definitely appreciate the efforts by third parties to package Emscripten for users’ convenience, and we’d like to help out, please get in touch if you are such a packager!)
首先，检查下面的关于 Platform-specific notes ，然后安装必要的软件包。
Emscripten SDK (emsdk) 的核心驱动程序是 Python 脚本。 您可以通过以下方式首次获取它
# Get the emsdk repo git clone https://github.com/emscripten-core/emsdk.git # Enter that directory cd emsdk
你也可以不使用Git来获取emsdk，而是在 Github 上下载它.
# Fetch the latest version of the emsdk (not needed the first time you clone) git pull # Download and install the latest SDK tools. ./emsdk install latest # Make the "latest" SDK "active" for the current user. (writes ~/.emscripten file) ./emsdk activate latest # Activate PATH and other environment variables in the current terminal source ./emsdk_env.sh
./emsdk activate latest 和
source ./emsdk_env.sh 命令。
./emsdk install 1.38.45
When installing old versions from before the build infrastructure rewrite (anything before
1.38.33), you need to write something like
./emsdk install sdk-1.38.20-64bit (add
-64bit) as that was the naming convention at the time.
fastcomp 或 ``upstream``（不指定后端，则使用当前默认值），例如，
# Get a specific version using the upstream backend. ./emsdk install latest-upstream # Get a specific version using the fastcomp backend. ./emsdk install 1.38.45-fastcomp
There are also “tip-of-tree builds”, which are the very latest code that passes integration tests on Chromium CI. This is updated much more frequently than tagged releases, but may be less stable (we tag releases manually using a more careful procedure). Tip-of-tree builds may be useful for continuous integration that uses the emsdk (as Emscripten’s GitHub CI does), and you may want to use it in your own CI as well, so that if you find a regression on your project you can report it and prevent it from reaching a tagged release. Tip-of-builds may also be useful if you want to test a feature that just landed but didn’t reach a release yet. To use a tip-of-tree build, use the
tot target, and note that you must specify the backend explicitly,
# Get a tip-of-tree using the upstream backend. ./emsdk install tot-upstream # Get a tip-of-tree using the fastcomp backend. ./emsdk install tot-fastcomp
(In the above examples we installed the various targets; remember to also
activate them as in the full example from earlier.)
Instead of running emscripten on Windows directly, you can use the Windows Subsystem for Linux to run it in a Linux environment.
If you use MacOS 10.13.3 or later then you should have a new enough version of Python installed (older versions may not work due to a GitHub change with SSL). Otherwise you can manually install and use Python 2.7.12 or newer.
- Install Xcode from the macOS App Store.
- In Xcode | Preferences | Downloads, install Command Line Tools.
- Download and install latest CMake from Kitware CMake downloads.
Emsdk does not install any tools to the system, or otherwise interact with Linux package managers. All file changes are done inside the emsdk/ directory.
Python, CMake, and Java are not provided by emsdk. The user is expected to install these beforehand with the system package manager:
# Install Python sudo apt-get install python2.7 # Install CMake (optional, only needed for tests and building Binaryen) sudo apt-get install cmake # Install Java (optional, only needed for Closure Compiler minification) sudo apt-get install default-jre
You need Python 2.7.12 or newer because older versions may not work due to a GitHub change with SSL).
If you want to use your system’s Node.js instead of the emsdk’s, it may be
node instead of
nodejs, and you can adjust the
NODE_JS attribute of your
~/.emscripten file to point to it.
Git is not installed automatically. Git is only needed if you want to use tools from one of the development branches emscripten-incoming or emscripten-master:
# Install git sudo apt-get install git-core
The easiest way to verify the installation is to compile some code using Emscripten.
You only need to install the SDK once! After that you can update to the latest SDK at any time using Emscripten SDK (emsdk).
Type the following in a command prompt
# Fetch the latest registry of available tools. ./emsdk update # Download and install the latest SDK tools. ./emsdk install latest # Set up the compiler configuration to point to the "latest" SDK. ./emsdk activate latest # Activate PATH and other environment variables in the current terminal source ./emsdk_env.sh
The package manager can do many other maintenance tasks ranging from fetching specific old versions of the SDK through to using the versions of the tools on GitHub (or even your own fork). Check out all the possibilities in the “How to” guides.