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[gnulib.git] / m4 / gettimeofday.m4

diff --git a/m4/gettimeofday.m4 b/m4/gettimeofday.m4
index 836a4b9..0fec7d4 100644 (file)
--- a/m4/gettimeofday.m4
+++ b/m4/gettimeofday.m4
@@ -1,75 +1,101 @@
-#serial 3
+# serial 12
+
+# Copyright (C) 2001-2003, 2005, 2007, 2009 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.

 
 dnl From Jim Meyering.
 
 dnl From Jim Meyering.

-dnl
+
+AC_DEFUN([gl_FUNC_GETTIMEOFDAY],
+[
+  AC_REQUIRE([AC_C_RESTRICT])
+  AC_REQUIRE([gl_HEADER_SYS_TIME_H])
+  AC_CHECK_FUNCS_ONCE([gettimeofday])
+
+  AC_CACHE_CHECK([for gettimeofday with POSIX signature],
+    [gl_cv_func_gettimeofday_posix_signature],
+    [AC_COMPILE_IFELSE(
+       [AC_LANG_PROGRAM(
+         [[#include <sys/time.h>
+           struct timeval c;
+         ]],
+         [[
+           int (*f) (struct timeval *restrict, void *restrict) = gettimeofday;
+           int x = f (&c, 0);
+           return !(x | c.tv_sec | c.tv_usec);
+         ]])],
+       [gl_cv_func_gettimeofday_posix_signature=yes],
+       [gl_cv_func_gettimeofday_posix_signature=no])])
+
+  gl_FUNC_GETTIMEOFDAY_CLOBBER
+
+  if test $gl_cv_func_gettimeofday_posix_signature != yes; then
+    REPLACE_GETTIMEOFDAY=1
+    SYS_TIME_H=sys/time.h
+    if test $gl_cv_func_gettimeofday_clobber != yes; then
+      AC_LIBOBJ([gettimeofday])
+      gl_PREREQ_GETTIMEOFDAY
+    fi
+  fi
+])
+
+

 dnl See if gettimeofday clobbers the static buffer that localtime uses
 dnl See if gettimeofday clobbers the static buffer that localtime uses

-dnl for it's return value.  The gettimeofday function from Mac OS X 10.0.4,
-dnl i.e. Darwin 1.3.7 has this problem.
+dnl for its return value.  The gettimeofday function from Mac OS X 10.0.4
+dnl (i.e., Darwin 1.3.7) has this problem.

 dnl
 dnl If it does, then arrange to use gettimeofday and localtime only via
 dnl the wrapper functions that work around the problem.
 
 dnl
 dnl If it does, then arrange to use gettimeofday and localtime only via
 dnl the wrapper functions that work around the problem.
 

-AC_DEFUN([AC_FUNC_GETTIMEOFDAY_CLOBBER],
+AC_DEFUN([gl_FUNC_GETTIMEOFDAY_CLOBBER],

 [
 [

- AC_REQUIRE([AC_HEADER_TIME])
- AC_CHECK_HEADERS_ONCE(stdlib.h string.h)
- AC_CACHE_CHECK([whether gettimeofday clobbers localtime buffer],
-  jm_cv_func_gettimeofday_clobber,
-  [AC_TRY_RUN([
-#include <stdio.h>
-#if HAVE_STRING_H
-# include <string.h>
-#endif
+ AC_REQUIRE([gl_HEADER_SYS_TIME_H])

 
 

-#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
-
-#if HAVE_STDLIB_H
-# include <stdlib.h>
-#endif
+ AC_CACHE_CHECK([whether gettimeofday clobbers localtime buffer],
+  [gl_cv_func_gettimeofday_clobber],
+  [AC_RUN_IFELSE(
+     [AC_LANG_PROGRAM(
+       [[#include <string.h>
+         #include <sys/time.h>
+         #include <time.h>
+         #include <stdlib.h>
+       ]],
+       [[
+         time_t t = 0;
+         struct tm *lt;
+         struct tm saved_lt;
+         struct timeval tv;
+         lt = localtime (&t);
+         saved_lt = *lt;
+         gettimeofday (&tv, NULL);
+         return memcmp (lt, &saved_lt, sizeof (struct tm)) != 0;
+       ]])],
+     [gl_cv_func_gettimeofday_clobber=no],
+     [gl_cv_func_gettimeofday_clobber=yes],
+     dnl When crosscompiling, assume it is broken.
+     [gl_cv_func_gettimeofday_clobber=yes])])

 
 

-int
-main ()
-{
-  time_t t = 0;
-  struct tm *lt;
-  struct tm saved_lt;
-  struct timeval tv;
-  lt = localtime (&t);
-  saved_lt = *lt;
-  gettimeofday (&tv, NULL);
-  if (memcmp (lt, &saved_lt, sizeof (struct tm)) != 0)
-    exit (1);
+ if test $gl_cv_func_gettimeofday_clobber = yes; then
+   REPLACE_GETTIMEOFDAY=1
+   SYS_TIME_H=sys/time.h
+   gl_GETTIMEOFDAY_REPLACE_LOCALTIME
+   AC_DEFINE([GETTIMEOFDAY_CLOBBERS_LOCALTIME], [1],
+     [Define if gettimeofday clobbers the localtime buffer.])
+ fi
+])

 
 

-  exit (0);
-}
-         ],
-        jm_cv_func_gettimeofday_clobber=no,
-        jm_cv_func_gettimeofday_clobber=yes,
-        dnl When crosscompiling, assume it is broken.
-        jm_cv_func_gettimeofday_clobber=yes)
-  ])
-  if test $jm_cv_func_gettimeofday_clobber = yes; then
-    AC_LIBOBJ(gettimeofday)
-    AC_DEFINE(localtime, rpl_localtime,
-      [Define to rpl_localtime if the replacement function should be used.])
-    AC_DEFINE(gettimeofday, rpl_gettimeofday,
-      [Define to rpl_gettimeofday if the replacement function should be used.])
-    AC_DEFINE(GETTIMEOFDAY_CLOBBERS_LOCALTIME_BUFFER, 1,
-      [Define if gettimeofday clobbers localtime's static buffer.])
-    gl_PREREQ_GETTIMEOFDAY
-  fi
+AC_DEFUN([gl_GETTIMEOFDAY_REPLACE_LOCALTIME], [
+  AC_LIBOBJ([gettimeofday])
+  gl_PREREQ_GETTIMEOFDAY
+  AC_DEFINE([gmtime], [rpl_gmtime],
+    [Define to rpl_gmtime if the replacement function should be used.])
+  AC_DEFINE([localtime], [rpl_localtime],
+    [Define to rpl_localtime if the replacement function should be used.])

 ])
 
 # Prerequisites of lib/gettimeofday.c.
 AC_DEFUN([gl_PREREQ_GETTIMEOFDAY], [
 ])
 
 # Prerequisites of lib/gettimeofday.c.
 AC_DEFUN([gl_PREREQ_GETTIMEOFDAY], [

-  AC_REQUIRE([AC_HEADER_TIME])
+  AC_CHECK_HEADERS([sys/timeb.h])
+  AC_CHECK_FUNCS([_ftime])

 ])
 ])