1. Linaro-gdb cannot be used in the cross-compilation environment.

Reference: https://stackoverflow.com/questions/25314983/ldd-says-not-found-even-though-library-is-in-my-ld-library-path

In the cross-compilation environment, gdb reports an error and lacks libncurses.so.5. But using ldconfig -p | grep libncurses.so.5 can be found.

It may be caused by a conflict between 32-bit and 64-bit. The library is 64-bit, but the program is 32-bit. You can use file to confirm separately.

$ file libpmsfdcwrt.so
libpmsfdcwrt.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped

$ file
/lib64/libz.so.1.2.3 /lib64/libz.so.1.2.3: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, stripped

Solution: Download the 64-bit version of gdb to solve it (from the official website).