[gdb/testsuite] Add string cat for tcl version < 8.6.2

I noticed that we started using "string cat", which has been available since
tcl version 8.6.2.

Add a local implementation for use with older tcl versions.

Tested on x86_64-linux.

Approved-By: Andrew Burgess <aburgess@redhat.com>

2 files changed, 45 insertions, 7 deletions

diff --git a/gdb/testsuite/gdb.testsuite/string-cat.exp b/gdb/testsuite/gdb.testsuite/string-cat.exp
new file mode 100644
index 0000000..057aeb2
--- /dev/null
+++ b/gdb/testsuite/gdb.testsuite/string-cat.exp
@@ -0,0 +1,15 @@
+# Copyright 2024 Free Software Foundation, Inc.
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+gdb_assert { [string cat "foo" "bar"] == "foobar" }
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 590cd45..dfe19c9 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -1607,13 +1607,23 @@ proc python_version_at_least { major minor } {
 		<= [list $python_version_major $python_version_minor]]
 }
 
-# Return 1 if tcl version used is at least MAJOR.MINOR
-proc tcl_version_at_least { major minor } {
-    global tcl_version
-    regexp {^([0-9]+)\.([0-9]+)$} $tcl_version \
-	dummy tcl_version_major tcl_version_minor
-    return [version_compare [list $major $minor] \
-		<= [list $tcl_version_major $tcl_version_minor]]
+# Return 1 if tcl version used is at least MAJOR.MINOR.PATCHLEVEL.
+proc tcl_version_at_least { major minor {patchlevel 0} } {
+    global tcl_patchLevel
+    regexp {^([0-9]+)\.([0-9]+)\.([0-9]+)$} \
+	$tcl_patchLevel dummy \
+	tcl_version_major tcl_version_minor tcl_version_patchlevel
+    return \
+	[version_compare \
+	     [list \
+		  $major \
+		  $minor \
+		  $patchlevel] \
+	     <= \
+	     [list \
+		  $tcl_version_major \
+		  $tcl_version_minor \
+		  $tcl_version_patchlevel]]
 }
 
 if { [tcl_version_at_least 8 5] == 0 } {
@@ -1648,6 +1658,19 @@ if { [tcl_version_at_least 8 6] == 0 } {
     }
 }
 
+if { [tcl_version_at_least 8 6 2] == 0 } {
+    # string cat was added in tcl 8.6.2.  Only add if missing.
+
+    rename string tcl_proc_string
+
+    proc string { what args } {
+	if { $what == "cat" } {
+	    return [join $args ""]
+	}
+	return [tcl_proc_string $what {*}$args]
+    }
+}
+
 # gdb_test_no_output [-prompt PROMPT_REGEXP] [-nopass] COMMAND [MESSAGE]
 # Send a command to GDB and verify that this command generated no output.
 #