Yes, you can use the -Werror flag when calling gcc to treat all warnings as errors. This will cause gcc to stop compilation if it encounters any implicit function declarations, and will output an error message instead of a warning.

For example, you can use the following command to compile your code with the -Werror flag:

gcc -Werror -o my_program my_program.c

This will produce an error if any implicit function declarations are found in the code. However, keep in mind that this may also cause other warnings to be treated as errors, so you may want to use this flag carefully and only when necessary.
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