whats your target architecture ? sometimes gdbserver port may not be
available for a given arch.

Hi Alexander and KhemRaj,

I am using the Yocto "thud" version which has long term support.

The architecture used is aarch64-oe-linux

The gdb directory or executables were not created in tmp/work/.../gdb/deploy-*/ (the gdb WORKDIR), nor in tmp/deploy/... (packages deploy dir), and neither in tmp/work/..../machine-image/ (image-specific package repo), although the compilation went through successfully.

Could it be that the architecture "aarch64-oe-linux" is not supported for gdbserver in Yocto "thud" ?

Regards
Ash