It would help if you explained why you think it is a good idea ignoring the other phi arguments if you have one (or more) where you can determine length.
It's a heuristic that was meant just for the -Wformat-overflow warning. When making decisions that affect code generation it's obviously not correct to ignore the possibility that unknown arguments may be shorter than the minimum or longer than the maximum. The fuzzy argument was meant to differentiate between two got but I forgot about it when I added the fix for PR 83671. For GCC 8 I don't have a preference for how to fix this as long as it doesn't regress the warning tests. I think the ultimate solution (for GCC 9) may be to either disable the heuristic for code generation purposes (e.g., via another argument/flag) or provide a pointer argument to indicate to the caller that the minimum is based on known strings, and that the real minimum may be zero. Martin
