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Bug#1087630: marked as done (libstdc++-12-dev: std::chrono::milliseconds template class Rep overflows signed integer type)

Your message dated Sat, 16 Nov 2024 17:19:36 +0100
with message-id <17352ea8-c36f-421e-a1a7-6fbcdd829c5d@debian.org>
and subject line Re: Bug#1087630: libstdc++-12-dev: std::chrono::milliseconds template class Rep overflows signed integer type
has caused the Debian Bug report #1087630,
regarding libstdc++-12-dev: std::chrono::milliseconds template class Rep overflows signed integer type
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
1087630: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1087630
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: libstdc++-12-dev
Version: 12.2.0-14+rpi1
Severity: normal
X-Debbugs-Cc: software@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

--- End Message ---
--- Begin Message --- 
On 16.11.24 15:09, Andreas Christ wrote:

Package: libstdc++-12-dev
Version: 12.2.0-14+rpi1
closing as invalid. This is not a Debian package. Please file it for the distro you got that from.
--- End Message ---
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