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Fixed a small bug.
author MrJuneJune <me@mrjunejune.com>
date Fri, 23 Jan 2026 22:41:04 -0800
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1 Emscripten SDK
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2 ==============
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4 [![CircleCI](https://circleci.com/gh/emscripten-core/emsdk/tree/main.svg?style=svg)](https://circleci.com/gh/emscripten-core/emsdk/tree/main)
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6 The Emscripten toolchain is distributed as a standalone Emscripten SDK. The SDK
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7 provides all the required tools, such as Clang, Python and Node.js along with an
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8 update mechanism that enables migrating to newer Emscripten versions as they are
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9 released.
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11 You can also set up Emscripten from source, without the pre-built SDK, see
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12 "Installing from Source" below.
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14 ## Downloads / How do I get the latest Emscripten build?
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16 To get started with Emscripten development, see the [Emscripten website
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17 documentation](https://emscripten.org/docs/getting_started/downloads.html).
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19 That explains how to use the emsdk to get the latest binary builds (without
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20 compiling from source). Basically, that amounts to
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22 ```
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23 git pull
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24 ./emsdk install latest
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25 ./emsdk activate latest
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26 ```
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28 ## SDK Concepts
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30 The Emscripten SDK is effectively a small package manager for tools that are
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31 used in conjunction with Emscripten. The following glossary highlights the
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32 important concepts to help understanding the internals of the SDK:
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34 * **Tool**: The basic unit of software bundled in the SDK. A Tool has a name and
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35 a version. For example, 'clang-3.2-32bit' is a Tool that contains the 32-bit
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36 version of the Clang v3.2 compiler.
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37 * **SDK**: A set of tools. For example, 'sdk-1.5.6-32bit' is an SDK consisting
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38 of the tools `clang-3.2-32bit`, `node-0.10.17-32bit`, `python-2.7.5.1-32bit`
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39 and `emscripten-1.5.6`.
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40 * **Active Tool/SDK**: Emscripten SDK stores compiler configuration in a file
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41 called `.emscripten` within the emsdk directory. This file points to paths
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42 for Emscripten, Python, Clang and so on. If the configuration file points to a
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43 Tool in a specific directory, then that tool is denoted as being
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44 **active**. This mechanism allows switching between different installed
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45 tools and SDKs.
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46 * **emsdk**: This is the name of the manager script that Emscripten SDK is
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47 accessed through. Most operations are of the form `emsdk <command>`.
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48
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49 ## System Requirements
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51 Using the emsdk pre-compiled packages requires only the minimal set of
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52 dependencies lists below. When building from source a wider set of tools
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53 include git, cmake, and a host compiler are required. See:
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54 https://emscripten.org/docs/building_from_source/toolchain_what_is_needed.html.
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56 ### Mac OS X
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57
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58 - macOS 11.0 or newer.
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59 - `java`: For running closure compiler (optional). After installing emscripten
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60 via emsdk, typing 'emcc --help' should pop up a OS X dialog "Java is not
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61 installed. To open java, you need a Java SE 6 runtime. Would you like to
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62 install one now?" that will automatically download a Java runtime to the
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63 system.
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64
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65 ### Linux
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66
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67 - `python`: Version 3.8 or above.
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68 - `java`: For running closure compiler (optional)
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69
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70 The emsdk pre-compiled binaries are built against debian/stretch (for x86_64)
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71 and debian/bullseye (for arm64) sysroots and therefore depend on system
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72 libraries compatible with the version of `glibc` (and other libraries) present
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73 in those releases. If your linux distribution is very old you may not be able to
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74 use the pre-compiled binaries packages. Note that `libc++` is statically linked
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75 so there should be no issues with older versions of `libstdc++` or `libc++`.
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77 ### Windows
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78
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79 - `java`: For running closure compiler (optional)
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81 ## Uninstalling the Emscripten SDK
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83 To remove the Emscripten SDK, simply delete the emsdk directory.
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85 ## SDK Maintenance
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86
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87 The following tasks are common with the Emscripten SDK:
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89 ### How do I work the emsdk utility?
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90
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91 Run `emsdk help` or just `emsdk` to get information about all available commands.
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93 ### How do I check the installation status and version of the SDK and tools?
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94
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95 To get a list of all currently installed tools and SDK versions, and all
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96 available tools, run `emsdk list`.
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97 * A line will be printed for each tool/SDK that is available for installation.
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98 * The text `INSTALLED` will be shown for each tool that has already been
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99 installed.
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100 * If a tool/SDK is currently active, a star * will be shown next to it.
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101 * If a tool/SDK is currently active, but the terminal your are calling emsdk
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102 from does not have `PATH` and environment set up to utilize that tool, a star
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103 in parentheses (\*) will be shown next to it. Run `emsdk_env.bat` (Windows) or
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104 `source ./emsdk_env.sh` (Linux and OS X) to set up the environment for the
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105 calling terminal.
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106
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107 ### How do I install a tool/SDK version?
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108
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109 Run the command `emsdk install <tool/sdk name>` to download and install a new
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110 tool or an SDK version.
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111
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112 ### How do I remove a tool or an SDK?
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113
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114 Run the command `emsdk uninstall <tool/sdk name>` to delete the given tool or
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115 SDK from the local hard drive completely.
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116
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117 ### How do I check for updates to the Emscripten SDK?
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118
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119 `emsdk update` will fetch package information for all the new tools and
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120 SDK versions. After that, run `emsdk install <tool/sdk name>` to install a new
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121 version.
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122
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123 ### How do I install an old Emscripten compiler version?
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124
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125 Emsdk contains a history of old compiler versions that you can use to maintain
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126 your migration path. Type `emsdk list --old` to get a list of archived tool and
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127 SDK versions, and `emsdk install <name_of_tool>` to install it.
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128
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129 ### I want to build from source!
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130
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131 Some Emsdk Tool and SDK targets refer to packages that are precompiled, and
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132 no compilation is needed when installing them. Other Emsdk Tools and SDK
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133 targets come "from source", meaning that they will fetch the source repositories
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134 using git, and compile the package on demand.
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135
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136 When you run `emsdk list`, it will group the Tools and SDKs under these two
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137 categories.
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138
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139 To obtain and build latest wasm SDK from source, run
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140
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141 ```
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142 emsdk install sdk-main-64bit
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143 emsdk activate sdk-main-64bit
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144 ```
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145
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146 You can use this target for example to bootstrap developing patches to LLVM,
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147 Binaryen or Emscripten. (After initial installation, use `git remote add`
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148 in the cloned tree to add your own fork to push changes as patches)
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149
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150 If you only intend to contribute to Emscripten repository, and not to LLVM
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151 or Binaryen, you can also use precompiled versions of them, and only git
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152 clone the Emscripten repository. For more details, see
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153
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154 https://emscripten.org/docs/contributing/developers_guide.html?highlight=developer#setting-up
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155
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156 ### When working on git branches compiled from source, how do I update to a newer compiler version?
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157
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158 Unlike tags and precompiled versions, a few of the SDK packages are based on
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159 "moving" git branches and compiled from source (e.g. sdk-main,
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160 sdk-main, emscripten-main, binaryen-main). Because of that, the
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161 compiled versions will eventually go out of date as new commits are introduced
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162 to the development branches. To update an old compiled installation of one of
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163 this branches, simply reissue the "emsdk install" command on that tool/SDK. This
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164 will `git pull` the latest changes to the branch and issue an incremental
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165 recompilation of the target in question. This way you can keep calling `emsdk
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166 install` to keep an Emscripten installation up to date with a given git branch.
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167
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168 Note though that if the previously compiled branch is very old, sometimes CMake
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169 gets confused and is unable to properly rebuild a project. This has happened in
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170 the past e.g. when LLVM migrated to requiring a newer CMake version. In cases of
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171 any odd compilation errors, it is advised to try deleting the intermediate build
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172 directory to clear the build (e.g. "emsdk/clang/fastcomp/build_xxx/") before
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173 reissuing `emsdk install`.
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174
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175 ### How do I change the currently active SDK version?
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176
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177 You can toggle between different tools and SDK versions by running `emsdk
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178 activate <tool/sdk name>`. Activating a tool will set up `~/.emscripten` to
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179 point to that particular tool. On Windows, you can pass the option `--permanent` to
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180 the `activate` command to register the environment permanently for the current user. Use `--system` to do this for all users.
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181
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182 ### How do I track the latest Emscripten development with the SDK?
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183
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184 A common and supported use case of the Emscripten SDK is to enable the workflow
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185 where you directly interact with the github repositories. This allows you to
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186 obtain new features and latest fixes immediately as they are pushed to the
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187 github repository, without having to wait for release to be tagged. You do not
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188 need a github account or a fork of Emscripten to do this. To switch to using the
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189 latest git development branch `main`, run the following:
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190
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191 emsdk install git-1.9.4 # Install git. Skip if the system already has it.
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192 emsdk install sdk-main-64bit # Clone+pull the latest emscripten-core/emscripten/main.
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193 emsdk activate sdk-main-64bit # Set the main SDK as the currently active one.
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194
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195 ### How do I use my own Emscripten github fork with the SDK?
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196
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197 It is also possible to use your own fork of the Emscripten repository via the
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198 SDK. This is achieved with standard git machinery, so if you are already
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199 acquainted with working on multiple remotes in a git clone, these steps should
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200 be familiar to you. This is useful in the case when you want to make your own
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201 modifications to the Emscripten toolchain, but still keep using the SDK
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202 environment and tools. To set up your own fork as the currently active
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203 Emscripten toolchain, first install the `sdk-main` SDK like shown in the
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204 previous section, and then run the following commands in the emsdk directory:
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205
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206 cd emscripten/main
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207 # Add a git remote link to your own repository.
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208 git remote add myremote https://github.com/mygituseraccount/emscripten.git
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209 # Obtain the changes in your link.
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210 git fetch myremote
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211 # Switch the emscripten-main tool to use your fork.
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212 git checkout -b mymain --track myremote/main
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213
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214 In this way you can utilize the Emscripten SDK tools while using your own git
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215 fork. You can switch back and forth between remotes via the `git checkout`
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216 command as usual.
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217
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218 ### How do I use Emscripten SDK with a custom version of python, java, node.js or some other tool?
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219
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220 The provided Emscripten SDK targets are metapackages that refer to a specific
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221 set of tools that have been tested to work together. For example,
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222 `sdk-1.35.0-64bit` is an alias to the individual packages `clang-e1.35.0-64bit`,
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223 `node-4.1.1-64bit`, `python-2.7.5.3-64bit` and `emscripten-1.35.0`. This means
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224 that if you install this version of the SDK, both python and node.js will be
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225 installed inside emsdk as well. If you want to use your own/system python or
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226 node.js instead, you can opt to install emsdk by specifying the individual set
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227 of packages that you want to use. For example, `emsdk install
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228 clang-e1.35.0-64bit emscripten-1.35.0` will only install the Emscripten
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229 LLVM/Clang compiler and the Emscripten frontend without supplying python and
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230 node.js.
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231
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232 ### My installation fails with "fatal error: ld terminated with signal 9 [Killed]"?
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233
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234 This may happen if the system runs out of memory. If you are attempting to build
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235 one of the packages from source and are running in a virtual OS or may have
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236 relatively little RAM and disk space available, then the build might fail. Try
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237 feeding your computer more memory. Another thing to try is to force emsdk
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238 install to build in a singlethreaded mode, which will require less RAM
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239 simultaneously. To do this, pass the `-j1` flag to the `emsdk install` command.
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240
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241 ### How do I run Emscripten on 32-bit systems or non-x86-64 systems?
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242
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243 Emscripten SDK releases are no longer packaged or maintained for 32-bit systems.
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244 If you want to run Emscripten on a 32-bit system, you can try manually building
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245 the compiler. Follow the steps in the above section "Building an Emscripten tag
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246 or branch from source" to get started.