Re: AC_STRUCT_TIMEZONE tzname on mingw

[Paul Eggert]

Kevin Ryde <address@hidden> writes:

> As you say, HAVE_DECL_TZNAME would surely be the right thing for the
> latter.

OK, I installed this patch.

2004-03-28  Paul Eggert  <address@hidden>

        * doc/autoconf.texi (Particular Structures): AC_STRUCT_TIMEZONE
        now defines HAVE_DECL_TZNAME if it is declared, when
        HAVE_STRUCT_TM_TM_ZONE is not defined.
        * lib/autoconf/types.m4 (AC_STRUCT_TIMEZONE): Implement this.
        Do not assume atoi.  Rely on HAVE_DECL_TZNAME when testing
        for HAVE_TZNAME.

Index: doc/autoconf.texi
===================================================================
RCS file: /cvsroot/autoconf/autoconf/doc/autoconf.texi,v
retrieving revision 1.806
diff -p -u -r1.806 autoconf.texi
--- doc/autoconf.texi   24 Mar 2004 22:40:15 -0000      1.806
+++ doc/autoconf.texi   28 Mar 2004 21:47:26 -0000
@@ -5094,7 +5094,8 @@ had better define @code{struct tm}.
 Figure out how to get the current timezone.  If @code{struct tm} has a
 @code{tm_zone} member, define @code{HAVE_STRUCT_TM_TM_ZONE} (and the
 obsoleted @code{HAVE_TM_ZONE}).  Otherwise, if the external array
address@hidden is found, define @code{HAVE_TZNAME}.
address@hidden is found, define @code{HAVE_TZNAME}; if it is declared,
+define @code{HAVE_DECL_TZNAME}.
 @end defmac
 
 @node Generic Structures
Index: lib/autoconf/types.m4
===================================================================
RCS file: /cvsroot/autoconf/autoconf/lib/autoconf/types.m4,v
retrieving revision 1.26
diff -p -u -r1.26 types.m4
--- lib/autoconf/types.m4       15 Mar 2004 22:00:06 -0000      1.26
+++ lib/autoconf/types.m4       28 Mar 2004 21:47:27 -0000
@@ -614,14 +614,15 @@ if test "$ac_cv_member_struct_tm_tm_zone
            [Define to 1 if your `struct tm' has `tm_zone'. Deprecated, use
             `HAVE_STRUCT_TM_TM_ZONE' instead.])
 else
+  AC_CHECK_DECLS([tzname], , , [#include <time.h>])
   AC_CACHE_CHECK(for tzname, ac_cv_var_tzname,
 [AC_LINK_IFELSE([AC_LANG_PROGRAM(
 [[#include <time.h>
-#ifndef tzname /* For SGI.  */
-extern char *tzname[]; /* RS6000 and others reject char **tzname.  */
+#if !HAVE_DECL_TZNAME
+extern char *tzname[];
 #endif
 ]],
-[atoi(*tzname);])],
+[[return tzname[0][0];]])],
                [ac_cv_var_tzname=yes],
                [ac_cv_var_tzname=no])])
   if test $ac_cv_var_tzname = yes; then