[tex-live] fc-cache documentation ?

[Arthur Reutenauer]

> But I am still puzzled as to know how how Knuth's "B L User" is intended to (a) learn of the existence of fc-cache (and presumably, some of the other fc-tools), (b) understand their potential importance in terms of the run-time for XeTeX and friends, and (c) learn how/when to invoke fc-cache.

  By reading the documentation?  Try “texdoc xetex-reference”.
Fontconfig is mentioned in the second paragraph of the part about fonts.

> or is the latter a completely separate subsystem on which TeX Live depends but does not invoke directly nor document in any way ?

  Yes, it is.  Had you really not heard of it before?

	Arthur