c - undefined reference 'shm_open' ，已在此处添加 -lrt 标志

Question

我刚刚遇到系统崩溃并重新安装 Ubuntu 11.10，我的代码产生了这个奇怪的错误。

我编写了一个简单的代码示例来测试问题所在:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>

int main (void) {

    int i;

    i = shm_open ("/tmp/shared", O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);   printf ("shm_open rc = %d\n", i);

    shm_unlink ("/tmp/shared");

    return (0);
}

编译命令为

gcc -lrt test.c -o test

错误是:

/tmp/ccxVIUiP.o: In function `main':
test.c:(.text+0x21): undefined reference to `shm_open'
test.c:(.text+0x46): undefined reference to `shm_unlink'
collect2: ld returned 1 exit status

我已经添加了-lrt lib，为什么还是编译不了？

Answer 1

最后的库:

gcc test.c -o test -lrt

来自GCC Link Options :

-llibrary-l library    Search the library named library when linking.     (The second alternative with the library as a separate argument    is only for POSIX compliance and is not recommended.)    It makes a difference where in the command you write this option;    the linker searches and processes libraries and object files in the    order they are specified.    Thus, `foo.o -lz bar.o' searches library `z' after file foo.o but    before bar.o. If bar.o refers to functions in `z', those functions    may not be loaded.