Скачать или смотреть Resolving Undefined Symbols for Architecture arm64 Errors While Compiling with OpenSSL

Learn how to solve the `Undefined symbols for architecture arm64` error when using OpenSSL and GCC on macOS with this step-by-step guide.
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Resolving Undefined Symbols for Architecture arm64 Errors While Compiling with OpenSSL

When working with C programming and libraries such as OpenSSL, you may sometimes encounter linking errors during compilation. One common error message that Signal a problem is: Undefined symbols for architecture arm64: _BN_new. This can be particularly frustrating, especially for those who are new to C programming or using third-party libraries. In this guide, we will explore this error in detail and provide a clear solution to resolve it.

Understanding the Problem

You might face the following scenario while trying to compile a simple C program using the OpenSSL library:

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

When you attempt to compile the above code with a command such as:

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

You may receive an error message like the one below:

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

This error indicates that your code references the BN_new function, but the linker cannot find its definition in the compiled libraries. The function is part of the libcrypto library provided by OpenSSL, which means you need to properly link against this library during compilation.

Solution: Linking the Library Correctly

To resolve this error, you need to ensure that you are linking the libcrypto library when you compile your code. Here’s how to do that in a few simple steps:

Step 1: Adjust Your Compile Command

Add the -lcrypto Flag: Modify your gcc compile command to include -lcrypto at the end. This tells the linker to link against the OpenSSL crypto library where the BN_new function is defined.

Your command should look like this:

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

Step 2: Understanding Command Components

-I/opt/homebrew/opt/openssl@ 1.1/include: This option specifies the directory to search for header files, allowing the compiler to find the OpenSSL headers.

-L/opt/homebrew/opt/openssl@ 1.1/lib: This option adds the specified directory to the search path for libraries.

-lcrypto: This is the crucial addition that tells the linker to include the OpenSSL crypto library in the linking process.

Step 3: Compile Again

After adjusting the command, run the compilation again and it should execute without any errors, successfully creating your executable.

Additional Considerations

If you continued to experience issues with other architectures (like x86_64), ensure that you are using compatible versions of compilers and libraries.

Always verify that the libraries you are attempting to link to are correctly installed and accessible.

Conclusion

Linking errors such as Undefined symbols for architecture arm64: _BN_new can be daunting, but they are usually straightforward to resolve by ensuring that you correctly link against the required libraries. By following the steps provided in this guide, you should now be equipped with the knowledge to successfully compile your C programs with OpenSSL on macOS.

If you have further questions or run into more issues, feel free to share them in the comments below. Happy coding!