[PATCH] [gdb/testsuite] Skip aarch64 in skip_gdbserver_test if no xml support

[Tom de Vries <tdevries@suse.de>]

From: Tom de Vries <tdevries@ampere3.arch.suse.de>

On aarch64-linux, with a gdb build without libexpat, so without xml support, I
run into:
...
(gdb) builtin_spawn attach-no-multi-process^M
attach 26808^M
Attaching to Remote target^M
warning: Can not parse XML target description; XML support was disabled at \
  compile time^M
Reading symbols from attach-no-multi-process...^M
Remote 'g' packet reply is too long (expected 788 bytes, got 796 bytes): ... ^M
...

The test-case checks for skip_gdbserver_tests and that one contains a check
for xml support:
...
    # If GDB is lack of XML support, and targets, like arm, have
    # multiple target descriptions, GDB doesn't know which target
    # description GDBserver uses, and may fail to parse 'g' packet
    # after connection.
    if { [gdb_skip_xml_test]
	 && ([istarget "arm*-*-linux*"]
	      || [istarget "mips*-*-linux*"]
	      || [istarget "powerpc*-*-linux*"]
	      || [istarget "s390*-*-linux*"]
	      || [istarget "x86_64-*-linux*"]
	      || [istarget "i\[34567\]86-*-linux*"]) } {
	return 1
    }
...
but it doesn't trigger because aarch64 is missing.

Fix this by adding istarget "aarch64*-*-linux*".

Tested on aarch64-linux.
---
 gdb/testsuite/lib/gdbserver-support.exp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gdb/testsuite/lib/gdbserver-support.exp b/gdb/testsuite/lib/gdbserver-support.exp
index 3f2cec246fa..c9f0c35c07e 100644
--- a/gdb/testsuite/lib/gdbserver-support.exp
+++ b/gdb/testsuite/lib/gdbserver-support.exp
@@ -173,6 +173,7 @@ proc skip_gdbserver_tests { } {
     # after connection.
     if { [gdb_skip_xml_test]
 	 && ([istarget "arm*-*-linux*"]
+	     || [istarget "aarch64*-*-linux*"]
 	     || [istarget "mips*-*-linux*"]
 	     || [istarget "powerpc*-*-linux*"]
 	     || [istarget "s390*-*-linux*"]
-- 
2.35.3