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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] f89f52168f
[2] https://sourceware.org/bugzilla/show_bug.cgi?id=30710
[3] https://sourceware.org/git/?p=glibc.git;a=blob;f=time/tzset.c;h=78c18f8147415c92dc6eb735be672fa7e0b8f76e;hb=47b76f6d1d3a5ad13e585dbcc616aaea62b8bb20#l380
Ref:
https://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html
Fixe:
https://gitlab.com/buildroot.org/buildroot/-/jobs/4768561117
Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>