Gcc 如何知道二进制文件是否已链接到；“馅饼”；链接器标志？_Gcc_Linker

Gcc 如何知道二进制文件是否已链接到；“馅饼”；链接器标志？

gcc linker

Gcc 如何知道二进制文件是否已链接到；“馅饼”；链接器标志？,gcc,linker,Gcc,Linker,我想知道在链接过程中是否使用位置独立可执行标志链接了二进制文件。这里有一种方法： main.c #include <stdio.h> int main(void) { puts(__func__); return 0; } 请参阅程序标题（my^^-注释）：编译并链接饼图： $ gcc -Wall -fPIC -c main.c $ gcc -Wall -pie main.o 再次查看程序标题： $ readelf -l a.out Elf file ty

我想知道在链接过程中是否使用位置独立可执行标志链接了二进制文件。

这里有一种方法：

main.c

#include <stdio.h>

int main(void)
{
    puts(__func__);
    return 0;
}

请参阅程序标题（my

^^

-注释）：

编译并链接饼图：

$ gcc -Wall -fPIC -c main.c
$ gcc -Wall -pie main.o

再次查看程序标题：

$ readelf -l a.out 

Elf file type is DYN (Shared object file)
                 ^^^^^^^^^^^^^^^^^^^^^^^^
Entry point 0x530
            ^^^^^
            | Offset from unknown load address
There are 9 program headers, starting at offset 64

Program Headers:
  Type           Offset             VirtAddr           PhysAddr
                 FileSiz            MemSiz              Flags  Align
  PHDR           0x0000000000000040 0x0000000000000040 0x0000000000000040
                 0x00000000000001f8 0x00000000000001f8  R      0x8
  INTERP         0x0000000000000238 0x0000000000000238 0x0000000000000238
                 0x000000000000001c 0x000000000000001c  R      0x1
      [Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]
  LOAD           0x0000000000000000 0x0000000000000000 0x0000000000000000
                                                       ^^^^^^^^^^^^^^^^^^
                                                       | Unknown load address
                 0x0000000000000830 0x0000000000000830  R E    0x200000
  LOAD           0x0000000000000db8 0x0000000000200db8 0x0000000000200db8
                 0x0000000000000258 0x0000000000000260  RW     0x200000
  DYNAMIC        0x0000000000000dc8 0x0000000000200dc8 0x0000000000200dc8
                 0x00000000000001f0 0x00000000000001f0  RW     0x8
  NOTE           0x0000000000000254 0x0000000000000254 0x0000000000000254
                 0x0000000000000044 0x0000000000000044  R      0x4
  GNU_EH_FRAME   0x00000000000006ec 0x00000000000006ec 0x00000000000006ec
                 0x000000000000003c 0x000000000000003c  R      0x4
  GNU_STACK      0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x0000000000000000 0x0000000000000000  RW     0x10
  GNU_RELRO      0x0000000000000db8 0x0000000000200db8 0x0000000000200db8
                 0x0000000000000248 0x0000000000000248  R      0x1

$ gcc -Wall -fPIC -c main.c
$ gcc -Wall -pie main.o

$ readelf -l a.out 

Elf file type is DYN (Shared object file)
                 ^^^^^^^^^^^^^^^^^^^^^^^^
Entry point 0x530
            ^^^^^
            | Offset from unknown load address
There are 9 program headers, starting at offset 64

Program Headers:
  Type           Offset             VirtAddr           PhysAddr
                 FileSiz            MemSiz              Flags  Align
  PHDR           0x0000000000000040 0x0000000000000040 0x0000000000000040
                 0x00000000000001f8 0x00000000000001f8  R      0x8
  INTERP         0x0000000000000238 0x0000000000000238 0x0000000000000238
                 0x000000000000001c 0x000000000000001c  R      0x1
      [Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]
  LOAD           0x0000000000000000 0x0000000000000000 0x0000000000000000
                                                       ^^^^^^^^^^^^^^^^^^
                                                       | Unknown load address
                 0x0000000000000830 0x0000000000000830  R E    0x200000
  LOAD           0x0000000000000db8 0x0000000000200db8 0x0000000000200db8
                 0x0000000000000258 0x0000000000000260  RW     0x200000
  DYNAMIC        0x0000000000000dc8 0x0000000000200dc8 0x0000000000200dc8
                 0x00000000000001f0 0x00000000000001f0  RW     0x8
  NOTE           0x0000000000000254 0x0000000000000254 0x0000000000000254
                 0x0000000000000044 0x0000000000000044  R      0x4
  GNU_EH_FRAME   0x00000000000006ec 0x00000000000006ec 0x00000000000006ec
                 0x000000000000003c 0x000000000000003c  R      0x4
  GNU_STACK      0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x0000000000000000 0x0000000000000000  RW     0x10
  GNU_RELRO      0x0000000000000db8 0x0000000000200db8 0x0000000000200db8
                 0x0000000000000248 0x0000000000000248  R      0x1