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Help developers create APIs that can run on multiple platforms and be used with a variety of languages
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dunhor Update ABI tool for new fast ABI design and other changes for integra…
…ting into the Windows build (#327)

* Start modifying fastabi implementation and add experimental support

* Sorting is working WOOO

* Fast ABI interface extension

* For Matt

* D colon

* Builtin types

* Report errors through exit code and allow directory inputs

* Have deprecated macro generation be opt-in since their use is not

* Small updates

* Address break in ubuntu build

* Add comment
Latest commit 7ebeff8 Apr 18, 2019
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design_notes XDN11 - Xlang Error handling (#235) Apr 18, 2019
docs Syntax issues on paragraph #52. Typo on #455 (#45) Oct 23, 2018
src Update ABI tool for new fast ABI design and other changes for integra… Apr 19, 2019
.gitattributes Move C++/WinRT coroutine helpers to dedicated header and add support … Feb 4, 2019
LICENSE Initial commit Jul 11, 2018 Enable Windows CI builds on AzDO (#92) Nov 9, 2018


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The xlang project enables developers to take existing shared libraries, implemented in one programming language and make that library's APIs available to client code using a different programming language. Thus the name "xlang", for cross-language.

Additionally, the xlang toolset will be available on multiple operating systems. This means that if your shared library is portable to various operating systems, then you can use the xlang tooling to make that shared library available to various client programming language on those various platforms.

More succinctly, you can take a library written in language A and make it available to language B applications running on platform C. The set of supported languages and platforms will expand as the project progresses.

The xlang project is in a very, very early stage of development. The project wants and encourages community feedback and contributions. As such, the xlang team is doing all xlang project development in the open on GitHub.

What xlang is NOT

  • The xlang project is not a port of the Windows Runtime, COM, DCOM or related technology.
  • The xlang project will not port the Windows Runtime APIs.

Project details

For details on project structure and build process, please see the Project Readme.

For technical design details, please see the Design Notes.


Code licensed under the MIT License.


This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit

When you submit a pull request, a CLA-bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact with any additional questions or comments.

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