• the target; see discussions for Target selection.
• the architecture; see discussions for Architecture selection.
• the linker emulation, applying to the linker only; see discussions for Linker emulation selection .

The commands to list valid values only list the values for which the programs you are running were configured. If they were configured with
‘--enable-targets=all’, the commands list most of the available values, but a few are left out; not all targets can be configured in at once because some of them can only be configured native (on hosts with the same type as the target system).