X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fgettimeofday.m4;h=770434ad90c171c4abbe359458c99f0999bec571;hb=2354d5ead305b61c925e53bcfb73d47de7c53162;hp=3e2baa1ea8c0c2465b8f35b145e7d590b4dd09c8;hpb=e3690a35bd90920179297ce0939230f786cdc475;p=gnulib.git

diff --git a/m4/gettimeofday.m4 b/m4/gettimeofday.m4
index 3e2baa1ea..770434ad9 100644
--- a/m4/gettimeofday.m4
+++ b/m4/gettimeofday.m4
@@ -1,67 +1,101 @@
-#serial 1
+#serial 11
+
+# Copyright (C) 2001, 2002, 2003, 2005, 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.
 
 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
+    GETTIMEOFDAY_REPLACEMENT=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 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 only via the wrapper
-dnl function that works around the problem.
+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(string.h stdlib.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
+ 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])])
 
-#if HAVE_STDLIB_H
-# include <stdlib.h>
-#endif
+ if test $gl_cv_func_gettimeofday_clobber = yes; then
+   GETTIMEOFDAY_REPLACEMENT=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
+])
 
-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);
+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.])
+])
 
-  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_UNQUOTED(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.])
-  fi
+# Prerequisites of lib/gettimeofday.c.
+AC_DEFUN([gl_PREREQ_GETTIMEOFDAY], [
+  AC_CHECK_HEADERS([sys/timeb.h])
+  AC_CHECK_FUNCS([_ftime])
 ])