gettimeofday: port recent C++ fix to Emacs

[gnulib.git] / m4 / tzset.m4

diff --git a/m4/tzset.m4 b/m4/tzset.m4
index 6df4eb7..54af5e0 100644 (file)
--- a/m4/tzset.m4
+++ b/m4/tzset.m4
@@ -1,4 +1,10 @@
-#serial 1
+# serial 7
+
+# Copyright (C) 2003, 2007, 2009-2013 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
@@ -7,23 +13,19 @@
 
 # Written by Paul Eggert and Jim Meyering.
 
+# A placeholder to ensure that this m4 file gets included by aclocal.
+AC_DEFUN([gl_FUNC_TZSET], [])
+
+# Set gl_cv_func_tzset_clobber.
 AC_DEFUN([gl_FUNC_TZSET_CLOBBER],
 [
-  AC_REQUIRE([AC_HEADER_TIME])
+  AC_REQUIRE([gl_HEADER_SYS_TIME_H])
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   AC_CACHE_CHECK([whether tzset clobbers localtime buffer],
                  gl_cv_func_tzset_clobber,
   [
   AC_RUN_IFELSE([AC_LANG_SOURCE([[
-#if TIME_WITH_SYS_TIME
-# include <sys/time.h>
-# include <time.h>
-#else
-# if HAVE_SYS_TIME_H
-#  include <sys/time.h>
-# else
-#  include <time.h>
-# endif
-#endif
+#include <time.h>
 #include <stdlib.h>
 
 int
@@ -36,27 +38,24 @@ main ()
   s = *p;
   putenv ("TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00");
   tzset ();
-  exit (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);
+  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])])
+       [case "$host_os" in
+                  # Guess all is fine on glibc systems.
+          *-gnu*) gl_cv_func_tzset_clobber="guessing no" ;;
+                  # If we don't know, assume the worst.
+          *)      gl_cv_func_tzset_clobber="guessing yes" ;;
+        esac
+       ])])
 
-  AC_DEFINE(HAVE_RUN_TZSET_TEST, 1,
+  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_BUFFER, 1,
-      [Define if tzset clobbers localtime's static buffer.])
-  fi
 ])