editline's readline compat

[Greg Troxel <gdt%lexort.com@localhost>]

(I've tried to find documentation and failed.)


I'm building a rc of mosquitto, an mqtt broker.  It is written to use
readline calls because that's normal.  But for licensing reasons, it
uses as an implementation editline aka libedit, via the portable version
of NetBSD's libedit, described in editline(3).

With portable editline, the readline wrapper is accessed by including
$prefix/editline/readline.h and then linking with lib/libedit.so.

But in NetBSD, one includes /usr/include/readline/readline.h and then
links with libedit.  Not with libreadline.

Programs thus should handle

  native NetBSD editline's readline compat
  portable editline's readline compat
  actual readline

questions:

  - Am I confused?

  - Is there standard cmake FindReadlineViaEditLine that does this?

  - Is there some other approach?

  - Is this really not documented?