c0dcefa7ba
We have changed to a Glibc based toolchain recently [1] but the
behavior of TZ handling is not the same between libc implementation
when no Zone Database is installed.
musl and uClibc-ng return "UTC" when the data file of the requested
time zone is missing or when TZ is not set.
# TZ=America/Los_Angeles date +%Z
UTC
# TZ= date +%Z
UTC
Glibc return all or part of TZ content or "Universal" if TZ is empty.
# TZ=America/Los_Angeles date +%Z
America
# TZ= date +%Z
Universal
As demonstrated by TestAllTimezone, Glibc return "PDT" when the
America/Los_Angeles time zone data file is installed:
# TZ=America/Los_Angeles date +%Z
PDT
Since the Glibc behavior seems weird (not a bug [2]) when TZ is
set but the time zone data file is missing, update our test
to check against a string defined in the Glibc code [3].
[1]
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