Question

I have a large codebase that uses a number of unsafe functions, such as gmtime and strtok. Rather than trying to search through the codebase and replace these wholesale, I would like to make the compiler emit a warning or error when it sees them (to highlight the problem to maintenance developers). Is this possible with GCC?

I already know about __attribute__((deprecated)), but AFAIK I can’t use it since I don’t have control of the header files where these functions are declared.

Answer 1

Create a custom header deprecated.h. In there, create your own wrapper functions, deprecated_strtok() etcetera that merely call strtok. Mark those with __attribute__((deprecated)). Below those definitions, #define strtok deprecated_strtok. Finally, use -include deprecated.h