[FYI] Generate more tags in gdb/testsuite/Makefile

[Tom Tromey]

I noticed that the TAGS target in gdb/testsuite/Makefile does not pick
up Tcl procs defined with proc_with_prefix or gdb_caching_proc.  This
patch fixes this by updating the regexp.

Tested in Emacs.

gdb/testsuite/ChangeLog
2018-09-13  Tom Tromey  <tom@tromey.com>

	* Makefile.in (TAGS): Recognize proc_with_prefix and
	gdb_caching_proc.
---
 gdb/testsuite/ChangeLog   | 5 +++++
 gdb/testsuite/Makefile.in | 4 +++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/Makefile.in b/gdb/testsuite/Makefile.in
index e7be686406b..ece7e252c51 100644
--- a/gdb/testsuite/Makefile.in
+++ b/gdb/testsuite/Makefile.in
@@ -348,7 +348,9 @@ config.status: configure
 
 TAGS: force
 	find $(srcdir) -name '*.exp' -print | \
-	    etags --regex='/proc[ \t]+\([^ \t]+\)/\1/' -
+	    etags \
+		--regex='/\(proc\|proc_with_prefix\|gdb_caching_proc\)[ \t]+\([^ \t]+\)/\2/' \
+		-
 
 # Build the expect wrapper script that preloads the read1.so library.
 expect-read1:
-- 
2.17.1