HAVE_TIMEZONE and cygwin

[Jerome Marc]

Nice job David. Have to be tested now.

 --- "Billinghurst, David (CRTS)"
<David.Billinghurst@riotinto.com> a écrit : > Here is
an untested patch for configure.in (trunk). 
> I have autoconf version
> problems, so this will have to do at present.  The
> code fragments do the right 
> thing.
> 
> Compiling this fails
> #include <time.h>
> void i(){long z2 = 2*timezone;}
> 
> but this is OK
> #include <time.h>
> long z2 = _timezone;
> 
> 2002-05-02  David Billinghurst
> <David.Billinghurst@riotinto.com>
> 
> 	* configure.in: Adjust test for HAVE_TIMEZONE so it
> fails
> 	on cygwin.  Add test HAVE_UNDERSCORE_TIMEZONE.
> 
> Index: configure.in
>
===================================================================
> RCS file: /cvs/gcc/gcc/libjava/configure.in,v
> retrieving revision 1.129
> diff -u -r1.129 configure.in
> --- configure.in        21 Apr 2002 09:37:48 -0000  
>    1.129
> +++ configure.in        2 May 2002 05:19:36 -0000
> @@ -852,10 +852,17 @@
>     dnl FIXME: we don't want a link check here
> because that won't work
>     dnl when cross-compiling.  So instead we make an
> assumption that
>     dnl the header file will mention timezone if it
> exists.
> -   AC_TRY_COMPILE([#include <time.h>], [long z2 =
> timezone;],
> +   dnl Don't find the win32 function timezone
> +   AC_TRY_COMPILE([#include <time.h>], [void
> i(){long z2 = 2*timezone;}],
>       [AC_DEFINE(HAVE_TIMEZONE)
>        AC_MSG_RESULT(yes)],
> -     [AC_MSG_RESULT(no)])])
> +     [AC_MSG_RESULT(no)
> +       AC_MSG_CHECKING([for global _timezone
> variable])
> +       dnl FIXME: As above, don't want link check
> +       AC_TRY_COMPILE([#include <time.h>], [long z2
> = _timezone;],
> +         [AC_DEFINE(HAVE_UNDERSCORE_TIMEZONE)
> +          AC_MSG_RESULT(yes)],
> +          [AC_MSG_RESULT(no)])])])
> 
>  AC_FUNC_ALLOCA
> 
> -----Original Message-----
> From: Billinghurst, David (CRTS) 
> Sent: Thursday, 2 May 2002 2:18 
> To: java@gcc.gnu.org
> Subject: HAVE_TIMEZONE and cygwin
> 
> 
> The cygwin patch for natSystem.cc
>
(http://gcc.gnu.org/ml/java-patches/2002-q2/msg00252.html)
> 
> probably should read something like
> 
> #elif HAVE_UNDERSCORE_TIMEZONE
>    tzoffset = _timezone;
> #elif HAVE_TIMEZONE
>    // timezone is secs WEST of UTC.
>    tzoffset = timezone;	
> #else
>    // FIXME: there must be another global if neither
> tm_gmtoff nor timezone
>    // is available, esp. if tzname is valid.
> 
> 
> To do this we need to add to libjava/configure.in 
> a test something like
> 
>    AC_TRY_COMPILE([#include <time.h>], [long z2 =
> _timezone;],
>      [AC_DEFINE(HAVE_UNDERSCORE_TIMEZONE)
>       AC_MSG_RESULT(yes)],
>      [AC_MSG_RESULT(no)])])
> 
> and preferably get the existing test    
> 
>    AC_TRY_COMPILE([#include <time.h>], [long z2 =
> timezone;],
>      [AC_DEFINE(HAVE_TIMEZONE)
>       AC_MSG_RESULT(yes)],
>      [AC_MSG_RESULT(no)])])
> 
> to fail for the cygwin <time.h> which has
>   char *_EXFUN(timezone, (void));
>  

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