Hm, good question - we do have our ‘bootstrap’ directory which includes some 
time zone headers, but those are the ones from unicode and not tzfile.h.

- Tony

> On Jul 6, 2017, at 11:42 AM, Alex Blewitt <alb...@apple.com> wrote:
> 
> It looks like it's /usr/share/zoneinfo on all Ubuntu versions:
> 
> alblue.local[~]$ docker run -it --rm ubuntu:14.04 find /usr -name zone.tab
> /usr/share/zoneinfo/zone.tab
> alblue.local[~]$ docker run -it --rm ubuntu:16.04 find /usr -name zone.tab
> /usr/share/zoneinfo/zone.tab
> alblue.local[~]$ docker run -it --rm ubuntu:16.10 find /usr -name zone.tab
> /usr/share/zoneinfo/zone.tab
> 
> This is the same that's coming from CFTimeZone.c:
> 
> https://github.com/apple/swift-corelibs-foundation/blob/2611dcd0d9b91fecace537838294bd85f0220503/CoreFoundation/NumberDate.subproj/CFTimeZone.c#L36-L39
>  
> <https://github.com/apple/swift-corelibs-foundation/blob/2611dcd0d9b91fecace537838294bd85f0220503/CoreFoundation/NumberDate.subproj/CFTimeZone.c#L36-L39>
> 
> Is it possible that the MacOS header is being included and defining TZDIR 
> before the CFTimeZone.c file is compiled?
> 
> Alex
> 
>> On 6 Jul 2017, at 19:22, Tony Parker via swift-corelibs-dev 
>> <swift-corelibs-dev@swift.org <mailto:swift-corelibs-dev@swift.org>> wrote:
>> 
>> Is the path to zoneinfo different on the Ubuntu docker image?
>> 
>> - Tony
>> 
>>> On Jul 6, 2017, at 9:36 AM, Youming Lin <y...@us.ibm.com 
>>> <mailto:y...@us.ibm.com>> wrote:
>>> 
>>> We were seeing this on Travis too. Specifically, on a Travis matrix build 
>>> using Swift 3.1.1 on a Ubuntu 16.04 docker image running inside a Travis 
>>> 14.04 VM.
>>> 
>>> The issue was specific to the Ubuntu 16.04 docker image; when I tested in 
>>> Ubuntu 16.04 OS as a guest VM, the issue went away.
>>> 
>>> Thanks,
>>> 
>>> Youming Lin
>>> IBM Cloud, Swift@IBM, Kitura developer
>>> Austin, TX
>>> GitHub: @youming-lin
>>> 
>>> <graycol.gif>Tony Parker via swift-corelibs-dev ---07/06/2017 10:31:15 
>>> AM---Yes, we’re discussing this one internally too and trying to figure out 
>>> what the right answer is. May
>>> 
>>> From: Tony Parker via swift-corelibs-dev <swift-corelibs-dev@swift.org 
>>> <mailto:swift-corelibs-dev@swift.org>>
>>> To: Ian Partridge <i...@poncho.org.uk <mailto:i...@poncho.org.uk>>
>>> Cc: swift-corelibs-dev <swift-corelibs-dev@swift.org 
>>> <mailto:swift-corelibs-dev@swift.org>>
>>> Date: 07/06/2017 10:31 AM
>>> Subject: Re: [swift-corelibs-dev] TimeZone database
>>> Sent by: swift-corelibs-dev-boun...@swift.org 
>>> <mailto:swift-corelibs-dev-boun...@swift.org>
>>> 
>>> 
>>> 
>>> Yes, we’re discussing this one internally too and trying to figure out what 
>>> the right answer is. Maybe the best solution for now is to find a good 
>>> mechanism to check the underlying version of the OS and split it out into a 
>>> function as you suggest.
>>> 
>>> - Tony
>>> On Jul 6, 2017, at 7:37 AM, Ian Partridge via swift-corelibs-dev 
>>> <swift-corelibs-dev@swift.org <mailto:swift-corelibs-dev@swift.org>> wrote:
>>> 
>>> Good shout Simon, you are right. I'm on Sierra. Compare and contrast:
>>> 
>>> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/tzfile.h
>>> #define TZDIR "/usr/share/zoneinfo"
>>> 
>>> /Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/tzfile.h
>>> #define TZDIR "/var/db/timezone/zoneinfo"
>>> 
>>> so I guess if I installed the High Sierra beta it would work OK.
>>> 
>>> I hacked CF to force it to use /usr/share/zoneinfo and TestFoundation
>>> is much happier, but that's not a solution.
>>> 
>>> On 6 July 2017 at 15:20, Simon Evans <s...@si.org <mailto:s...@si.org>> 
>>> wrote:
>>> Ian
>>> 
>>> I also saw this error, I think its because the TZDIR is different in the 
>>> headers shipped with Xcode 9. Maybe the location of the timezone directory 
>>> was moved between Sierra and High Sierra. What version of macOS are you 
>>> testing on?
>>> 
>>> If it has indeed moved between 10.12 and 10.13 it may require a runtime 
>>> version check to dynamically return TZDIR.
>>> 
>>> Simon
>>> 
>>> On 6 Jul 2017, at 15:09, Ian Partridge via swift-corelibs-dev 
>>> <swift-corelibs-dev@swift.org <mailto:swift-corelibs-dev@swift.org>> wrote:
>>> 
>>> Hi,
>>> 
>>> I'm seeing quite a lot of tests failing when running the
>>> TestFoundation target in Xcode. The failures are timezone related.
>>> Most simply, the code
>>> 
>>> let timeZone = TimeZone(abbreviation: "GMT")
>>> 
>>> is returning nil.
>>> 
>>> Walking through the CF code which sets things up, it seems to be
>>> trying to read the timezone database from
>>> /var/db/timezone/zoneinfo/zone.tab which doesn't exist on my macOS
>>> system.
>>> 
>>> /usr/share/zoneinfo/zone.tab is there and seems to be the right
>>> location (?), but CF is picking up TZDIR from tzfile.h which says:
>>> 
>>> #define TZDIR "/var/db/timezone/zoneinfo"
>>> 
>>> Any thoughts? I feel like I'm missing something obvious and have gone
>>> too far down the rabbit hole.
>>> 
>>> --
>>> Ian Partridge
>>> _______________________________________________
>>> swift-corelibs-dev mailing list
>>> swift-corelibs-dev@swift.org <mailto:swift-corelibs-dev@swift.org>
>>> https://lists.swift.org/mailman/listinfo/swift-corelibs-dev 
>>> <https://lists.swift.org/mailman/listinfo/swift-corelibs-dev>
>>> 
>>> 
>>> -- 
>>> Ian Partridge
>>> _______________________________________________
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>>> swift-corelibs-dev@swift.org <mailto:swift-corelibs-dev@swift.org>
>>> https://lists.swift.org/mailman/listinfo/swift-corelibs-dev 
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>>> 
>>> 
>> 
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