Package: libstdc++-12-dev Version: 12.2.0-14+rpi1 Severity: normal X-Debbugs-Cc: softw...@quantentunnel.de
Dear Maintainer, I use std::chrono::time_point<std::chrono::steady_clock, std::chrono::milliseconds> and the g++ compiler with -std=c++17. When I calculate the difference between two timepoints (i.e., a duration in std::chrono::milliseconds) and print the tick count obtained from count() using std::ostream and operator<<, then the difference is printed as a negative number when it should be a (large) positive number. Maybe the problem is in /usr/include/c++/12/bits/chrono.h where the definition of _GLIBCXX_CHRONO_INT64_T mixes signed and unsigned integers: "static_assert(std::numeric_limits<unsigned long long>::digits >= 64,...)" checks that an unsigned integer is sufficiently large, while "# define _GLIBCXX_CHRONO_INT64_T long long" omits signed or unsigned which defaults to my knowledge to signed. E.g., std::chrono::time_point<std::chrono::steady_clock, std::chrono::milliseconds>::max() minus ...::min() prints a tick count of -1 which supports that it should be max UINT64. -- System Information: Distributor ID: Raspbian Description: Raspbian GNU/Linux 12 (bookworm) Release: 12 Codename: bookworm Architecture: armv7l Kernel: Linux 6.6.31+rpt-rpi-v7 (SMP w/4 CPU threads) Kernel taint flags: TAINT_CRAP Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) Versions of packages libstdc++-12-dev depends on: ii gcc-12-base 12.2.0-14+rpi1 ii libc6-dev 2.36-9+rpt2+deb12u7 ii libgcc-12-dev 12.2.0-14+rpi1 ii libstdc++6 12.2.0-14+rpi1 libstdc++-12-dev recommends no packages. Versions of packages libstdc++-12-dev suggests: pn libstdc++-12-doc <none> -- no debconf information
