如何设置共享库的动态链接器路径？ [英] How to set the dynamic linker path for a shared library?

问题描述

我想用 .interp 段来编译共享库。

I want to compile a shared library with an .interp segment.

#include <stdio.h>

int foo(int argc, char** argv) {

    printf("Hello, world!\n");
    return 0;

}

我正在使用以下命令。

gcc -c -o test.o test.c
ld --dynamic-linker=blah -shared -o test.so test.o

我最终没有INTERP段，就好像我从未通过 - dynamic-linker = blah 选项。请检查 readelf -l test.so 。在构建可执行文件时，链接器会正确处理该选项，并将INTERP段放入程序头中。

I end up without an INTERP segment, as if I never passed the --dynamic-linker=blah option. Check with readelf -l test.so. When building an executable, the linker processes the option correctly and puts an INTERP segment in the program header. How to do I make it work for shared libraries too?

推荐答案

ld 不包含.interp节，如果使用 -shared ，就像@MichaelDillon所说的那样。

ld doesn't include a .interp section if -shared is used, as @MichaelDillon already said. You can however provide this section yourself.

const char interp_section[] __attribute__((section(".interp"))) = "/path/to/dynamic/linker";

上面这行将保存.interp中的字符串/ path / to / dynamic / linker部分使用 GCC属性。

The line above will save the string "/path/to/dynamic/linker" in the .interp section using GCC attributes.

如果您尝试构建也可以自行执行的共享对象，请检查此问题 out。它有一个更全面的过程描述。

If you're trying to build a shared object that's also executable by itself, check this question out. It has a more comprehensive description of the process.

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