Скачать или смотреть Resolving Linker Issues in C+ + with python.h

Struggling with linker errors while compiling C+ + code using `python.h`? This guide walks you through solving linker errors related to `-lpython3.4` and provides tips for leveraging `pkg-config`.
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This video is based on the question https://stackoverflow.com/q/66229077/ asked by the user 'PatXio' ( https://stackoverflow.com/u/9817556/ ) and on the answer https://stackoverflow.com/a/66229716/ provided by the user 'anthony sottile' ( https://stackoverflow.com/u/812183/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving Linker Issues in C+ + with python.h

When working on C+ + projects that require Python bindings, developers often run into linker errors, particularly when trying to link against the Python library. A common issue arises when the compiler fails to locate the necessary libraries, resulting in frustrating error messages like cannot find -lpython3.4. In this post, we’ll explore the problem and provide a clear path to a solution.

The Problem: Linker Errors

You may find yourself facing the following situation:

You have Python 3.4 installed along with its development package (python3-dev).

You also have Boost.Python installed, which allows you to interface C+ + with Python.

While compiling your C+ + file, you use a command similar to:

[[See Video to Reveal this Text or Code Snippet]]

However, when you run this command, you receive an error message indicating that the linker could not find the specified Python library:

[[See Video to Reveal this Text or Code Snippet]]

Despite various attempts to link with different flags, such as -lpython3, -lpython, and -Python3.4, you still run into issues.

The Solution: Using pkg-config

Step 1: Utilizing pkg-config

To effectively resolve the linker issue, you can leverage the pkg-config tool, which simplifies the process of retrieving the necessary compiler and linker flags for libraries. This tool can help you find the right linking flags for the version of Python you are working with.

Command to Use:
Run the following command in your terminal:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Understanding the Output

After running the above command, you should see an output similar to:

[[See Video to Reveal this Text or Code Snippet]]

This output represents the correct linking flag that you should use in your compilation command. The exact output may vary based on your installed version of Python.

Step 3: Update Your Compile Command

Once you have the output from pkg-config, you can update your g+ + compile command accordingly. For example, if the output is -lpython3.6m, your new command would look like this:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By utilizing pkg-config, you can easily find the correct linker flags for your specific Python version and avoid the frustration of compiler errors related to linking Python libraries.

If you continue to experience issues, consider checking your Python installation paths and ensuring that the development files are correctly installed.

Now, you should be well on your way to successfully compiling your C+ + files with Python bindings without running into linker errors. Happy coding!