RFC: update to Readline 8.1

RFC: update to Readline 8.1

[Tom Tromey]

I've pushed a branch, users/tromey/readline-8.1-update, to gdb git.  I
chose to do it this way, rather than sending a patch, as the changes are
large-ish and, for the most part, not written by me in any case.

This branch updates the tree to GNU Readline 8.1.  I did this via a 3rd
repository I have, that holds readline with the gdb-local changes.  (At
present, there are very few of these, essentially just in the build
infrastructure.)

This import required one additional patch in order to build on mingw.

In the future I hope to remove gdb's implementation of
operate-and-get-next, as this is now implemented directly in readline.
However, I haven't finished debugging this.  The latest status is here:

    https://lists.gnu.org/archive/html/bug-readline/2021-01/msg00006.html

There has been some off-list traffic after that, if you are interested,
I can fill you in.

Finally, I have not imported the fix for the "$if version" parsing bug I
found.  That's reported here:

    https://lists.gnu.org/archive/html/bug-readline/2021-01/msg00009.html

Perhaps I ought to do so?  I was not sure.

Let me know what you think.  I'd like to push this to master.

Tom

Re: RFC: update to Readline 8.1

[Tom Tromey]

Tom> In the future I hope to remove gdb's implementation of
Tom> operate-and-get-next, as this is now implemented directly in readline.
Tom> However, I haven't finished debugging this.  The latest status is here:

Tom>     https://lists.gnu.org/archive/html/bug-readline/2021-01/msg00006.html

It occurs to me that this can't be done until we upgrade the minimum
supported system version to 8.1.  So I guess we can shelve this for a
while.

Also, I forgot to mention that I regression tested this on x86-64 Fedora 32.

Tom

Re: RFC: update to Readline 8.1

[Tom Tromey]

Tom> I've pushed a branch, users/tromey/readline-8.1-update, to gdb git.  I
Tom> chose to do it this way, rather than sending a patch, as the changes are
Tom> large-ish and, for the most part, not written by me in any case.


Tom> Let me know what you think.  I'd like to push this to master.

I'm going to do that now.

Tom