Should You Use `__FILE__`, `__LINE__`, and `__func__` for C Logging and Debugging?

Using FILE__, __LINE__, and __FUNCTION for Logging and Debugging

When logging or debugging in C , it's common to use FILE__, __LINE__, and __FUNCTION macros to provide additional information about the location of a problem. However, one may wonder if there are any potential issues or reasons not to rely on these macros.

Reliability and Misleading Data

LINE and __FILE__: These macros are generally reliable for providing the correct line number and file name, respectively. They are evaluated during compilation and report the values as specified in the original source code. Optimization does not affect their accuracy.

__FUNCTION__: FUNCTION is not a standard C macro. In C99 and C 11, func can be used instead. Both of these macros provide the name of the function where they are used.

Performance Impact

FILE__, __LINE__, and __FUNCTION__/__func are all compile-time macro expansions. They are evaluated and expanded during compilation, leading to no additional performance overhead at runtime.

Conclusion

In summary, both LINE and FILE are reliable for providing information about file and line number. Optimization does not affect their accuracy. While FUNCTION is non-standard, func exists in C99 and C 11 and provides similar functionality. These macros can be used effectively for debugging and logging without concerns about incorrect data or performance impact.

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