https://wiki.qt.io/QtCS2024_Compile_once._Run_everywhere

QtCS2024 Compile once. Run everywhere

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Session Summary

Compiling and deploying of C++ applications on Windows, Linux, macOS
for x86_64 and arm64 can be challenging. By using Cosmopolitan Libc
we could have an alternative.

Slides at 2024.09.06/QtCS2024-CompileOnce-RunEverywhere.pdf * GitLab

Session Owners

Cristian Adam

Notes (AI transcribed)

Cristian Adam, a member of the Qt Creator team, presented a talk on
"Compile Once, Run Everywhere" using Cosmopolitan libc for C++
applications.

Key points include:

  * Qt Creator is currently compiled for multiple platforms (X64 and
    ARM64 for MacOS, separate packages for Linux, Windows ARM64 in
    progress) using the Qt installer framework.
  * Cosmopolitan libc is a C runtime that detects the host machine at
    runtime and provides the right system calls, enabling "compile
    once, run everywhere" for C++ applications.
  * Cosmopolitan applications are compiled twice (X64 and ARM64) and
    packaged as a batch script plus payload, similar to Linux run
    installers.
  * Mozilla's llamafile is an example of a Cosmopolitan application
    that runs locally after downloading and adding execute
    permissions.
  * Adam successfully built and ran CMake, Qt Base, and Qt GUI with
    VNC QPA using Cosmopolitan libc on MacOS and Linux, but
    encountered issues on Windows due to Cosmopolitan's Libc's POSIX
    implementation.
  * Challenges include integrating with native platforms, launching
    applications, and supporting WebSockets for Qt QPA VNC platform.
  * Adam demonstrated Qt Creator running in Cosmopolitan, with menus
    working but window borders missing.
  * The size of the Cosmopolitan Qt Creator binary is around 230
    megabytes, and there were no noteworthy performance differences
    compared to the native version.
  * Adam plans to continue working on Cosmopolitan support for Qt
    Creator and encourages others to contribute and report issues.

Retrieved from "https://wiki.qt.io/index.php?title=
QtCS2024_Compile_once._Run_everywhere&oldid=42513"
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  * QtCS2024

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  * This page was last edited on 6 September 2024, at 12:03.

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