unsigned integer overflow in format-inl.h

[federico-busato]

example:
fmt::print("{}, {}\n", 2172.112284689786, 0.18808973381374017);

fmt/format-inl.h:417:51: runtime error: unsigned integer overflow: 11 - 52 cannot be represented in type 'unsigned long'
fmt/format-inl.h:484:53: runtime error: unsigned integer overflow: 18446744073709551607 * 1292913986 cannot be represented in type 'unsigned long'
fmt/format-inl.h:417:35: runtime error: unsigned integer overflow: 1020 - 1023 cannot be represented in type 'unsigned long'

found with -fsanitize=undefined -fsanitize=unsigned-integer-overflow (clang 9)

I'm not sure if it is intentional or not. Reproducible on fmt-6.1.2
It can be also suppressed with __attribute__((no_sanitize("unsigned-integer-overflow")))

[vitaut]

Those overflows are benign but unnecessary. Should be gone as of 75765bf. Thanks for reporting.