bug#5597: Dired unable to properly recognize file names

[Glenn Morris]

Stefan Monnier wrote:

> I think it depends on whether your `ls' supports --dired.

Indeed it fails if one sets dired-use-ls-dired to nil.

That variable is initialized in a funny way, via

(string-match "gnu" system-configuration)

I guess (?) many Mac users do indeed have access to GNU ls, despite
not having "gnu" in their `system-configuration'.

It also doesn't really seem to be documented anywhere that dired will
perform less well if the underlying ls does not support --dired.