undefined reference to "ftime"

onmeiei

代码如下：
/* algo1-1.c 计算1-1/x+1/x*x… */
#include<stdio.h>
#include<sys/timeb.h>
void main()
{
   struct timeb t1,t2;
   long t;
   double x,sum=1,sum1;
   int i,j,n;
   printf("请输入x n：");
   scanf("%lf%d",&x,&n);
   ftime(&t1); /* 求得当前时间 */
   for(i=1;i<=n;i++)
   {
     sum1=1;
     for(j=1;j<=i;j++)
       sum1=-sum1/x;
     sum+=sum1;
   }
   ftime(&t2); /* 求得当前时间 */
   t=(t2.time-t1.time)*1000+(t2.millitm-t1.millitm); /* 计算时间差 */
   printf("sum=%lf 用时%ld毫秒\n",sum,t);
}
在freebsd下编译出的错误
gcc test.c

onmeiei

怎么包含库，指点下啊。。。。

onmeiei

#include<sys/timeb.h>
这个里面就有ftime的定义

madoldman

楼主不是include<sys/timeb.h>了吗？
在我这里编译正常貌似，我这是debian

[ 本帖最后由 madoldman 于 2008-9-25 14:17 编辑 ]

5毛党党员

g++ -v
Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.4/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-java-awt=gtk --host=i386-redhat-linux
Thread model: posix


我这可以编译过去Linux 2.6.9

madoldman

ftime是标准库里的函数阿

onmeiei

好象是少个libcompat

madoldman

libcompat??
ftime这个函数不是应该直接就在libc.so里面吗？

onmeiei

1 /*
      2  * Copyright (c) 1994 Christopher G. Demetriou
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *      This product includes software developed by Christopher G. Demetriou.
     16  * 4. The name of the author may not be used to endorse or promote products
     17  *    derived from this software without specific prior written permission
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  *
     30  * $FreeBSD: src/lib/libcompat/4.1/ftime.c,v 1.5 1999/08/28 00:04:12 peter Exp $
     31  * $DragonFly: src/lib/libcompat/4.1/ftime.c,v 1.2 2003/06/17 04:26:48 dillon Exp $
     32  */
     33
     34 #include <sys/types.h>
     35 #include <sys/time.h>
     36 #include <sys/timeb.h>
     37
     38 int
     39 ftime(tbp)
     40         struct timeb *tbp;
     41 {
     42         struct timezone tz;
     43         struct timeval t;
     44
     45         if (gettimeofday(&t, &tz) < 0)
     46                 return (-1);
     47         tbp->millitm = t.tv_usec / 1000;
     48         tbp->time = t.tv_sec;
     49         tbp->timezone = tz.tz_minuteswest;
     50         tbp->dstflag = tz.tz_dsttime;
     51
     52         return (0);
     53 }


我也不清楚，看到这么个东西，感觉可能是它的原因
不过还没有解决，我比较菜，所以以为可能是系统没弄好，于是在unix-center的远程机器上实验了一下，也是同样的错误，于是就放弃了。。

[ 本帖最后由 onmeiei 于 2008-9-28 14:49 编辑 ]