Linux &引用；错误的ELF类：ELF类32“；，但仅当使用GDB时

我正试图在调试器中运行。我运行的是64位Ubuntu Trusty，但矮人堡垒没有64位版本，所以我运行的是32位矮人堡垒。我已经通过apt-get-install-gdb:i386安装了gdb

以下是我使用gdb启动dfhack时发生的情况：

ben@australium:~/df_linux$ xvfb-run -a ./dfhack --gdb
GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./libs/Dwarf_Fortress...(no debugging symbols found)...done.
(gdb) start
Temporary breakpoint 1 at 0x804bdec
Starting program: /home/ben/df_linux/libs/Dwarf_Fortress 
ERROR: ld.so: object './hack/libdfhack.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".

Temporary breakpoint 1, 0xf7598b53 in main ()
   from /home/ben/df_linux/libs/libgraphics.so
(gdb) 

可执行文件、预加载库和gdb都是32位的：

ben@australium:~/df_linux$ readelf -h /home/ben/df_linux/libs/Dwarf_Fortress
ELF Header:
  Magic:   7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 
  Class:                             ELF32
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              EXEC (Executable file)
  Machine:                           Intel 80386
  Version:                           0x1
  Entry point address:               0x804c980
  Start of program headers:          52 (bytes into file)
  Start of section headers:          18192664 (bytes into file)
  Flags:                             0x0
  Size of this header:               52 (bytes)
  Size of program headers:           32 (bytes)
  Number of program headers:         8
  Size of section headers:           40 (bytes)
  Number of section headers:         28
  Section header string table index: 27
ben@australium:~/df_linux$ readelf -h /home/ben/df_linux/hack/libdfhack.so 
ELF Header:
  Magic:   7f 45 4c 46 01 01 01 03 00 00 00 00 00 00 00 00 
  Class:                             ELF32
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - GNU
  ABI Version:                       0
  Type:                              DYN (Shared object file)
  Machine:                           Intel 80386
  Version:                           0x1
  Entry point address:               0x1b7e40
  Start of program headers:          52 (bytes into file)
  Start of section headers:          43686636 (bytes into file)
  Flags:                             0x0
  Size of this header:               52 (bytes)
  Size of program headers:           32 (bytes)
  Number of program headers:         7
  Size of section headers:           40 (bytes)
  Number of section headers:         37
  Section header string table index: 34
ben@australium:~/df_linux$ readelf -h /usr/bin/gdb
ELF Header:
  Magic:   7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 
  Class:                             ELF32
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              EXEC (Executable file)
  Machine:                           Intel 80386
  Version:                           0x1
  Entry point address:               0x808cb95
  Start of program headers:          52 (bytes into file)
  Start of section headers:          5089368 (bytes into file)
  Flags:                             0x0
  Size of this header:               52 (bytes)
  Size of program headers:           32 (bytes)
  Number of program headers:         9
  Size of section headers:           40 (bytes)
  Number of section headers:         28
  Section header string table index: 27

错误：ld.so:object'./hack/libdfhack.so'无法从ld_预加载中预加载（错误的ELF类：ELFCLASS32）：忽略

此错误源于GDB启动（64位）shell，后者反过来执行（32位）

dfhack

程序

---

您应该只关心预加载到目标程序中。没有将

libdfhack.so

预加载到shell中这一事实无关紧要，您应该忽略它。

OS/ABI字段不同。那有关系吗？

ben@australium:~/df_linux$ readelf -h /home/ben/df_linux/libs/Dwarf_Fortress
ELF Header:
  Magic:   7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 
  Class:                             ELF32
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              EXEC (Executable file)
  Machine:                           Intel 80386
  Version:                           0x1
  Entry point address:               0x804c980
  Start of program headers:          52 (bytes into file)
  Start of section headers:          18192664 (bytes into file)
  Flags:                             0x0
  Size of this header:               52 (bytes)
  Size of program headers:           32 (bytes)
  Number of program headers:         8
  Size of section headers:           40 (bytes)
  Number of section headers:         28
  Section header string table index: 27
ben@australium:~/df_linux$ readelf -h /home/ben/df_linux/hack/libdfhack.so 
ELF Header:
  Magic:   7f 45 4c 46 01 01 01 03 00 00 00 00 00 00 00 00 
  Class:                             ELF32
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - GNU
  ABI Version:                       0
  Type:                              DYN (Shared object file)
  Machine:                           Intel 80386
  Version:                           0x1
  Entry point address:               0x1b7e40
  Start of program headers:          52 (bytes into file)
  Start of section headers:          43686636 (bytes into file)
  Flags:                             0x0
  Size of this header:               52 (bytes)
  Size of program headers:           32 (bytes)
  Number of program headers:         7
  Size of section headers:           40 (bytes)
  Number of section headers:         37
  Section header string table index: 34
ben@australium:~/df_linux$ readelf -h /usr/bin/gdb
ELF Header:
  Magic:   7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 
  Class:                             ELF32
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              EXEC (Executable file)
  Machine:                           Intel 80386
  Version:                           0x1
  Entry point address:               0x808cb95
  Start of program headers:          52 (bytes into file)
  Start of section headers:          5089368 (bytes into file)
  Flags:                             0x0
  Size of this header:               52 (bytes)
  Size of program headers:           32 (bytes)
  Number of program headers:         9
  Size of section headers:           40 (bytes)
  Number of section headers:         28
  Section header string table index: 27