For better visibility of all the file locations where you can place scripts to be auto-loaded with inferior — or to protect yourself against accidental execution of untrusted scripts — gdb provides a feature for printing all the files attempted to be loaded. Both existing and non-existing files may be printed.
For example the list of directories from which it is safe to auto-load files (see Auto-loading safe path) applies also to canonicalized filenames which may not be too obvious while setting it up.
(gdb) set debug auto-load on (gdb) file ~/src/t/true auto-load: Loading canned sequences of commands script "/tmp/true-gdb.gdb" for objfile "/tmp/true". auto-load: Updating directories of "/usr:/opt". auto-load: Using directory "/usr". auto-load: Using directory "/opt". warning: File "/tmp/true-gdb.gdb" auto-loading has been declined by your `auto-load safe-path' set to "/usr:/opt".
set debug auto-load [on|off]
show debug auto-load