Dynamic linking is not working with the firmware library

[ttc0419]

I downloaded the libjson.so library to the musl cross compile environment (/usr/aarch64-linux-gnu//musl), which has the layout as the following:

/usr/aarch64-linux-gnu/
├── bin
├── include
│   ├── arpa
│   └── ...
├── lib
│   ├── audit
│   ├── gconv
│   └── ldscripts
├── lib64
├── musl
│   ├── include
│   └── lib
└── usr
    └── bin

I also downloaded the header files to the include folder. However, I cannot compile my program:

[u@archlinux tmp.UZIJgdZKC7]$ musl-gcc t.c -ljson-c
/usr/lib/gcc/aarch64-linux-gnu/13.2.0/../../../../aarch64-linux-gnu/bin/ld: /usr/aarch64-linux-gnu/musl/lib/libjson-c.so: error adding symbols: file in wrong format
collect2: error: ld returned 1 exit status

What might be the problem? Is it because the section headers were removed in the library?

/usr/aarch64-linux-gnu/musl/lib/libjson-c.so.5.2.0: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, no section header

[jow]

Yes. Shared objects are aggressively stripped, including section headers crucial for linking. You can’t use the artifacts from the firmware rootfs for this purpose.

[ttc0419]

Thanks, does openwrt provide any rootfs that can be used for developing?

[jow]

No, you would need to use the SDK or buildroot to compile desired libraries.