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Diffstat (limited to 'm4/tzset.m4')
| -rw-r--r-- | m4/tzset.m4 | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/m4/tzset.m4 b/m4/tzset.m4 new file mode 100644 index 0000000..b8c111b --- /dev/null +++ b/m4/tzset.m4 @@ -0,0 +1,59 @@ +#serial 3 + +# Copyright (C) 2003, 2007 Free Software Foundation, Inc. +# This file is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# See if we have a working tzset function. +# If so, arrange to compile the wrapper function. +# For at least Solaris 2.5.1 and 2.6, this is necessary +# because tzset can clobber the contents of the buffer +# used by localtime. + +# Written by Paul Eggert and Jim Meyering. + +AC_DEFUN([gl_FUNC_TZSET_CLOBBER], +[ + AC_REQUIRE([gl_HEADER_SYS_TIME_H]) + AC_CACHE_CHECK([whether tzset clobbers localtime buffer], + gl_cv_func_tzset_clobber, + [ + AC_RUN_IFELSE([AC_LANG_SOURCE([[ +#include <time.h> +#include <stdlib.h> + +int +main () +{ + time_t t1 = 853958121; + struct tm *p, s; + putenv ("TZ=GMT0"); + p = localtime (&t1); + s = *p; + putenv ("TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"); + tzset (); + return (p->tm_year != s.tm_year + || p->tm_mon != s.tm_mon + || p->tm_mday != s.tm_mday + || p->tm_hour != s.tm_hour + || p->tm_min != s.tm_min + || p->tm_sec != s.tm_sec); +} + ]])], + [gl_cv_func_tzset_clobber=no], + [gl_cv_func_tzset_clobber=yes], + [gl_cv_func_tzset_clobber=yes])]) + + AC_DEFINE(HAVE_RUN_TZSET_TEST, 1, + [Define to 1 if you have run the test for working tzset.]) + + if test $gl_cv_func_tzset_clobber = yes; then + gl_GETTIMEOFDAY_REPLACE_LOCALTIME + + AC_DEFINE(tzset, rpl_tzset, + [Define to rpl_tzset if the wrapper function should be used.]) + AC_DEFINE([TZSET_CLOBBERS_LOCALTIME], 1, + [Define if tzset clobbers localtime's static buffer.]) + fi +]) |