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bug#21020: 24.4; `display-time-world' tampers with TZ

From: Paul Eggert
Subject: bug#21020: 24.4; `display-time-world' tampers with TZ
Date: Mon, 27 Jul 2015 08:02:53 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.8.0

Eli Zaretskii wrote:
I needed the changes in 7009674 to get this to build cleanly on
MinGW.  One of the changes in that commit is in lib/time.in.h.

Thanks, I ported that code fix back to gnulib, as gnulib master commit b18e6d98e211be6bb0e720952a9baef7da1d27cb.

It sounds like similar changes are needed in other Gnulib headers,
lest they produce similar problems at some point.  I can provide a
list of all the __need_SOMETHING symbols used by the MinGW headers, if
that will help.

I looked into that and came up with the following list:


The only other Gnulib header that refers to any of these symbols is stddef.in.h and if it's not used in MinGW then I expect we don't need to worry about it. Though there may be issues in MinGW itself, if it's using these symbols incompatibly with what GCC expects (stddef.h is a GCC header).

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