Why @vrindex instead of @ovindex? We already document:
@c Define an output variable index.
@defcodeindex ov
for all variables that are set during configure/autotest for use by
the remainder of the script.
[...]
Oh, I see - you're trying to make a distinction between @ovindex and
@vrindex. Can we document that distinction both in the commit
message and in the comments at the top of autoconf.texi that
describe all the various indices?
Sure. Here's a redo of the remainder of 1/2 and fixed 2/2, with
comments for the various indices updated. OK?
doc: index entries for non-environment, non-output variables.
* doc/autoconf.texi: Clarify the meaning of the various variable
indices. Merge variable index `vr' into concept index using
syncodeindex.
(Configuration Actions, Generic Programs, Generic Functions)
(Writing Testsuites): Add index entries for documented shell
variables used during in configure and testsuite scripts.