[PATCH] D72449: [PATCH] [llvm-ranlib] Take in consideration UTC offset for D-flag.test

[Adhemerval Zanella via Phabricator via cfe-commits]

zatrazz added a comment.

In D72449#1812130 <https://reviews.llvm.org/D72449#1812130>, @arichardson wrote:

> I was careful in the test to use `TZ=UTC` for all commands printing dates and it works fine for me in UTC+1 and in the UK which is currently UTC. Does the bot in question ignore the TZ variable?


The issue is setting TZ=UTC still might use internal database with UTC offsets. For instance, on the buildbot
that accused the regression, setting TZ=UTC make it use the tz database /usr/share/zoneinfo/UTC. At least
on Linux with glibc one way to actually use UTC without transit changes are to set TZ=":", it won't try to
access either the default '/etc/localtime'. However, I am not sure how portable it is and it might be in fact
an glibc issue (https://sourceware.org/bugzilla/show_bug.cgi?id=24004).


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