Valid ARM executable cannot find library

Question

I cross-compiled a small Hello World program for an embedded ARM device (Asus RT-AC68U router with DD-WRT):

# arm-linux-gnueabi-g++ hello.cpp -mcpu=cortex-a9 -s -o hello

The file looks fine:

# file hello
hello: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV),
dynamically linked (uses shared libs), for GNU/Linux 2.6.32, 
BuildID[sha1]=5099693c31154cdd7f04c16ced5b80b1e35e625b, stripped

It depends on several libraries:

# readelf -d hello

Dynamic section at offset 0xf08 contains 26 entries:
Tag        Type                         Name/Value
0x00000001 (NEEDED)                     Shared library: [libstdc++.so.6]
0x00000001 (NEEDED)                     Shared library: [libgcc_s.so.1]
0x00000001 (NEEDED)                     Shared library: [libc.so.6]
(...)

When I try to execute the file on the target system, I get the following:

# ./hello
-sh: ./hello: not found

If I run execution from ld-linux.so.3without any other parameters, everything works:

# /opt/lib/ld-linux.so.3 ./hello
Hello, world.

When listing the libraries, the file seems to look for libraries in the / lib folder (they are not there, they are in / opt / lib):

# /opt/lib/ld-linux.so.3 --list ./hello
    libstdc++.so.6 => /lib/libstdc++.so.6 (0x76dfb000)
    libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x76de0000)
    libc.so.6 => /opt/lib/libc.so.6 (0x76cb2000)
    libc.so => /lib/libc.so (0x76c35000)
    /lib/ld-linux.so.3 => /opt/lib/ld-linux.so.3 (0x76f20000)

I assume that the error is due to the fact that the executable file does not find the necessary shared libraries by itself. All necessary libraries are present in the / opt / lib folder, and this folder is included in the LD_LIBRARY_PATH environment variable:

# echo $LD_LIBRARY_PATH
/lib:/usr/lib:/jffs/lib:/jffs/usr/lib:/jffs/usr/local/lib
:/mmc/lib:/mmc/usr/lib:/opt/lib:/opt/usr/lib

?

: , . , .

Answer 1

ld-linux.so.3 (/opt/lib), , gcc . readelf -l <program>, , ( PT_INTERP, " -" ).

, , -Wl,--dynamic-linker=/opt/lib/ld-linux.so.3 gcc.