[tz] [tz-announce] 2022f release of tz code and data available

[Paul Eggert]

On 2022-10-28 21:19, Đoàn Trần Công Danh wrote:
> Bisecting shows that fdd27053, (Fix zdump undefined behavior if !USE_LTZ, 2022-10-26)
> is the first bad commit, reverting fdd27053 indeeds fix the problem for me.

Thanks for the bug report. It's a portability bug in zdump's tzalloc 
emulation, on platforms where tzcode thinks the system lacks tm_zone.

I see two problems here. First, tzcode wrongly thinks musl lacks 
tm_zone, and this hurts performance; second and more seriously (because 
it hurts correctness), on platforms lacking tm_zone zdump's tzalloc 
emulation returns a null pointer where it should return nonnull.

Please try either or both of the first two of the attached patches, 
which I have installed into the development repository. (The third patch 
just fixes commentary.)

Or you can build 2022f with no patches, by compiling with 'make 
CFLAGS="-DTM_ZONE=tm_zone -DTM_GMTOFF=tm_gmtoff"'. (On old-fashioned 
runtimes that lack tm_zone you should be able to work around the problem 
by compiling with 'make CFLAGS="-DHAVE_SETENV=0"', but this shouldn't be 
needed with musl unless your musl is pretty old.)
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