Efficiently Managing Shared Libraries in Yocto: Creating Symlinks for Version Control

Discover how to add `.so` files and create symlinks in your Yocto project, ensuring multiple library versions are handled properly.
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Efficiently Managing Shared Libraries in Yocto: Creating Symlinks for Version Control

When working on embedded Linux projects with Yocto, managing shared libraries can sometimes become a bit daunting, especially when you need to handle multiple versions of the same library. A common requirement is to maintain various versions of a library and provide a symlink that points to the latest version. This guide will guide you through the process of adding .so files and symlinks to your recipe without running into build errors.

The Problem: Building with Multiple Library Versions

When you are trying to create a Yocto recipe that incorporates a shared library, the need often arises to reference the latest version of that library through a symlink. For example, you may have a library called mylib located in:

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You want to create a symlink, such that:

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However, while your initial recipe may work without the symlink, adding the following line can lead to build errors:

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The error generated is:

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This suggests that the symlink creation strategy needs adjustment to meet Yocto's packaging standards.

The Solution: Properly Adding Symlinks in Yocto

To resolve this issue and successfully build your package while maintaining symlinks, follow these steps:

Step 1: Modify Your Recipe

Instead of directly adding your .so files to the development package (FILES_{PN}-dev), you should use FILES_SOLIBSDEV to include them. This approach ensures that the symlink is considered within Yocto's standards for shared libraries, avoiding QA issues.

Here’s how you can modify your recipe:

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Step 2: Verify Your Build

After making these changes, your build should complete successfully. It's essential to check that the dependent packages can recognize the shared library correctly. You can find the package files in the following directory:

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This directory structure will confirm that the libraries are being packaged correctly and are available for other components.

Conclusion

By following this structured approach, you can efficiently manage multiple versions of shared libraries within your Yocto project without running into build issues. Ensuring that symlinks are added correctly not only adheres to Yocto's packaging requirements but also aids in smoother library version management, making your build process more robust.

If you encounter any challenges or have questions regarding this process, feel free to reach out to the community or consult the Yocto documentation for further guidance.

Keep your libraries organized and your builds successful!

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