https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114770
Bug ID: 114770
Summary: std::chrono::locate_zone("Asia/Chungking") fails on
Debian Sid
Product: gcc
Version: 13.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
#include <chrono>
int main()
{
(void) std::chrono::locate_zone("Asia/Chungking");
}
With the latest tzdata (version 2024a-2) on Debian Sid this fails:
terminate called after throwing an instance of 'std::runtime_error'
what(): tzdb: cannot locate zone: Asia/Chungking
Aborted (core dumped)
The problem is a Debian patch that enables link chaining, so that one link can
have another link as its target:
https://sources.debian.org/patches/tzdata/2024a-2/ziguard.awk-Move-link-to-link-feature-from-vanguard-to-ma.patch/
This feature was added to tzdata in 2022, but isn't compatible with the
expectations of the C++20 standard. When chrono::locate_zone finds a link, it
expects its target to be a zone, not another link.
