3 # Copyright (C) 2003, 2007, 2009-2011 Free Software Foundation, Inc.
4 # This file is free software; the Free Software Foundation
5 # gives unlimited permission to copy and/or distribute it,
6 # with or without modifications, as long as this notice is preserved.
8 # See if we have a working tzset function.
9 # If so, arrange to compile the wrapper function.
10 # For at least Solaris 2.5.1 and 2.6, this is necessary
11 # because tzset can clobber the contents of the buffer
14 # Written by Paul Eggert and Jim Meyering.
16 AC_DEFUN([gl_FUNC_TZSET_CLOBBER],
18 AC_REQUIRE([gl_HEADER_SYS_TIME_H])
19 AC_CACHE_CHECK([whether tzset clobbers localtime buffer],
20 gl_cv_func_tzset_clobber,
22 AC_RUN_IFELSE([AC_LANG_SOURCE([[
29 time_t t1 = 853958121;
34 putenv ("TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00");
36 return (p->tm_year != s.tm_year
37 || p->tm_mon != s.tm_mon
38 || p->tm_mday != s.tm_mday
39 || p->tm_hour != s.tm_hour
40 || p->tm_min != s.tm_min
41 || p->tm_sec != s.tm_sec);
44 [gl_cv_func_tzset_clobber=no],
45 [gl_cv_func_tzset_clobber=yes],
46 [gl_cv_func_tzset_clobber=yes])])
48 AC_DEFINE([HAVE_RUN_TZSET_TEST], [1],
49 [Define to 1 if you have run the test for working tzset.])
51 if test $gl_cv_func_tzset_clobber = yes; then
52 gl_GETTIMEOFDAY_REPLACE_LOCALTIME
54 AC_DEFINE([tzset], [rpl_tzset],
55 [Define to rpl_tzset if the wrapper function should be used.])
56 AC_DEFINE([TZSET_CLOBBERS_LOCALTIME], [1],
57 [Define if tzset clobbers localtime's static buffer.])