我有以下问题:
- 我有旧系统 - ARM CPU。
- 在遗留系统上,我没有开发库,也没有 GCC。
- 在遗留系统上,我没有足够的资源(主要是 RAM 和 SWAP 是不可能的)来编译。
我需要编译我有源代码的非常简单的程序。当我在另一台也有 ARM CPU(更新一点)的机器上使用以下 GCC 命令编译它时:
gcc -mcpu=arm920t -march=armv4t -o app app.c
(-mcpu 和 -march 设置为遗留系统的 CPU)
当我将此编译文件复制到旧系统时,使其可执行并尝试运行它,我收到以下消息:
$ ./app
-sh: ./app: No such file or directory
$ ls -lah
total 237K
drwxr-xr-x 2 root root 0 Apr 4 07:35 .
drwxr-xr-x 4 root root 0 Dec 31 1969 ..
-rwxr-xr-x 1 root root 108K Mar 14 09:23 app
$
路径没有问题,没有使用 noexec 选项挂载分区。当我将任何系统(例如 cat)文件复制到同一目录时,我可以毫无问题地启动它。
这是我编译的应用程序(第一个结果)和已经在系统上的应用程序(第二个结果)之间的区别:
$ readelf -h app
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: ARM
Version: 0x1
Entry point address: 0xa278
Start of program headers: 52 (bytes into file)
Start of section headers: 100104 (bytes into file)
Flags: 0x5000002, has entry point, Version5 EABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 10
Size of section headers: 40 (bytes)
Number of section headers: 38
Section header string table index: 35
$
和:
$ readelf -h cat
ELF Header:
Magic: 7f 45 4c 46 01 01 01 61 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: ARM
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x8c34
Start of program headers: 52 (bytes into file)
Start of section headers: 15220 (bytes into file)
Flags: 0x2, has entry point, GNU EABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 6
Size of section headers: 40 (bytes)
Number of section headers: 24
Section header string table index: 23
$
输出file cat app
:
app: ELF 32-bit LSB executable, ARM, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.16, not stripped
cat: ELF 32-bit LSB executable, ARM, version 1, dynamically linked (uses shared libs), for GNU/Linux 2.2.0, stripped
我不确定这里有什么问题,因为即使应用程序编译错误,我也希望收到与“没有这样的文件或目录”不同的错误消息。