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Date:	Wed, 23 Jan 2008 11:13:43 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: HDF5 and timezone
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On Jan 23 15:17, Mark Hadfield wrote:
> Building HDF5 (either the recently released RC1 or the previous beta 5)
> under Cygwin fails with
>
> gcc -DHAVE_CONFIG_H -I. -DNDEBUG -UH5_DEBUG_API -std=c99 -pedantic -Wall 
> -Wextra -Wundef -Wshadow -Wpointer-arith -Wbad-function-cast -Wcast-qual 
> -Wcast-align -Wwrite-strings -Wconversion -Wsign-compare -Waggregate-return 
> -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations 
> -Wredundant-decls -Wnested-externs -Winline -Wno-long-long -Wfloat-equal 
> -Wmissing-format-attribute -Wmissing-noreturn -Wpacked 
> -Wdisabled-optimization -Wmultichar -Wendif-labels 
> -Wdeclaration-after-statement -Wold-style-definition -Winvalid-pch -O 
> -fomit-frame-pointer -finline-functions -MT H5Omtime.lo -MD -MP -MF 
> .deps/H5Omtime.Tpo -c H5Omtime.c -o H5Omtime.o
> H5Omtime.c: In function `H5O_mtime_decode':
> H5Omtime.c:194: warning: implicit declaration of function `tzset'
> H5Omtime.c:194: warning: nested extern declaration of `tzset'
> H5Omtime.c:230: error: `timezone' undeclared (first use in this function)
> H5Omtime.c:230: error: (Each undeclared identifier is reported only once
> H5Omtime.c:230: error: for each function it appears in.)
>
> Back on 27 November 2007 I built beta 5 with no problems.
>
> Is this likely to be related to the new Cygwin versions released in 
> December? I can see some discussion of timezone and tzset on the list 
> archives in the last couple of months, but don't know whether they relate 
> to my problem.

Earlier versions of Cygwin allowed to link against a very old,
very non-standard, timezone() function.  Since Cygwin 1.5.25,
the timezone() function is only available as exported symbol for
old applications built against earlier Cygwin release.

For new applications, timezone is only available as variable of
type long, according to POSIX.  See

  http://www.opengroup.org/onlinepubs/009695399/functions/timezone.html

I assume that HDF5 special cases the usage of timezone as being a
function for Cygwin.  Remove this code and use the timezone variable as
on other POSIX compliant systems.  Make sure that <time.h> gets included
before using the timezone variable.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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