我刚刚系统崩溃并重新安装了 Ubuntu 11.10，我的代码产生了这个奇怪的错误。
我写了一个简单的代码示例来测试问题出在哪里:
#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);
}
编译命令是
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
我已经加了-lrt lib，为什么还是编译不出来？
最佳答案
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.
关于c - undefined reference 'shm_open' ，已在此处添加 -lrt 标志，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/9923495/