Why Do I Get Unresolved Linker Symbols When Compiling C Code?

Unresolved Linker Symbols When Compiling C Code

When attempting to compile C code using the C front-end, such as by invoking gcc, you may encounter errors due to unresolved symbols related to the standard C library. This occurs when the linker is not properly configured to include the necessary C libraries.

Identifying the Issue

The error message typically provides clues about the missing symbols, such as "std::cout" or "std::ios_base::Init". These symbols are essential for C functionality.

Resolution

To resolve the issue, ensure that you are using the appropriate compiler that understands and links C code, such as g or clang . These compilers automatically include the correct libraries.

If you are using gcc or clang directly, you can add the "-lstdc " flag to the link line to explicitly specify the C standard library.

Additional Information

• Using g or clang :

g++ example.cpp
clang++ example.cpp

• Adding "-lstdc " to the link line:

If you are using clang, you can use the "-v" flag to view the link line and verify that it includes the "-lstdc " flag:

clang -v example.cpp

Conclusion

By using the appropriate compiler and ensuring that the C standard library is included, you can prevent linker errors when compiling C code.

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