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我正在尝试使用 Libelf 库来获取有关某些 elf 文件的一些信息。但我不断收到这些“未定义的对 [...] 的引用”。我从突触安装了 libelf（也尝试从网站获取），并且 lib 似乎安装得很好。

我的代码：

#include <err.h>
#include <fcntl.h>
#include <sysexits.h>
#include <unistd.h>

#include <stdio.h>
#include <stdlib.h>
#include <libelf.h>

int main(int argc, char * argv[]) {
    Elf *elf_file;
    Elf_Kind  elf_kind_file;
    int file_descriptor;

    if((argc!=2)) 
        printf("Argumento em formato nao esperado\n");

    file_descriptor = open(argv[1], O_RDONLY, 0);
    elf_file = elf_begin(file_descriptor, ELF_C_READ, NULL);
    elf_kind_file = elf_kind(elf_file);

    elf_end(elf_file);
    close(file_descriptor);


    return 0;
}

这是我从终端得到的（目前使用的是 Ubuntu 11.4）：

gcc sample.c -o sample
/tmp/ccP7v2DT.o: In function `main':
sample.c:(.text+0x57): undefined reference to `elf_begin'
sample.c:(.text+0x67): undefined reference to `elf_kind'
sample.c:(.text+0x77): undefined reference to `elf_end'
collect2: ld returned 1 exit status

更新

解决了我在编译期间将 -lelf 放在我的文件之前的所有问题。最后一个我只能解决将我的 libelf 更新到新版本（在 Synaptic Manager 上不可用）：

wget http://ftp.br.debian.org/debian/pool/main/e/elfutils/libelf-dev_0.153-1_i386.deb
wget http://ftp.br.debian.org/debian/pool/main/e/elfutils/libelf1_0.153-1_i386.deb
sudo dpkg -i libelf-dev_0.153-1_i386.deb libelf1_0.153-1_i386.deb
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1 回答 1

5

You probably need to link to the library. The standard way to do this is:

gcc sample.c -l elf -o sample

This searches the standard library directories for libelf.a, and includes the relevant object files in that archive into the build. Assuming the library has been installed correctly, libelf.a or a similarly-named file should exist.

于 2012-05-14T21:26:33.383 回答