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bug#23164: 25.1.50; xref-find-definitions with local tags-file-name fail

From: Dmitry Gutov
Subject: bug#23164: 25.1.50; xref-find-definitions with local tags-file-name fails
Date: Thu, 7 Apr 2016 06:15:19 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.0

On 04/05/2016 12:24 AM, Johan Claesson wrote:

It also occur with other simple TAGS files that do not include other
TAGS files.  And the TAGS file i was using when observing the problem
the first time was this kind of simple TAGS file.

Right, thank you.

Apparently, the long-standing way to make it work is to call visit-tags-table with non-nil second argument, instead of just using setq-local. So, this seems to work correctly:

(visit-tags-table "~/examples/ruby/TAGS" t)
(xref-find-definitions "a")

It performs more work in advance, though, and I'm not sure what's the big picture with keeping variables like tags-table-list global anyway.

Here's a patch you can try that makes etags--xref-find-definitions work with your original scenario, but I'm not 100% sure it's good code. The proper solution to setting tags-file-name locally probably looks different.

diff --git a/lisp/progmodes/etags.el b/lisp/progmodes/etags.el
index a2a0df2..856d26b 100644
--- a/lisp/progmodes/etags.el
+++ b/lisp/progmodes/etags.el
@@ -2111,6 +2111,7 @@ etags--xref-find-definitions
+      (visit-tags-table-buffer) ; Workaround for bug#23164
       (while (visit-tags-table-buffer (not first-time))
         (setq first-time nil)
         (dolist (order-fun (cond (regexp? find-tag-regexp-tag-order)

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