[gdb/testsuite] Fix gdb.ada/big_packed_array.exp on s390x-linux

When running test-case gdb.ada/big_packed_array.exp on s390x-linux, I run
into:
...
(gdb) print bad^M
$2 = (0 => 0 <repeats 24 times>, 1)^M
(gdb) FAIL: gdb.ada/big_packed_array.exp: scenario=minimal: print bad
...

This is with gcc 7.5.0, and this xfail should trigger:
...
           if { $have_xfail && [string is integer $last] \
                   && [expr ($last & 0xf) == 0] } {
                # gcc/101643
                setup_xfail *-*-*
            }
...
but it doesn't because $last is '1'.

Fix this by using 0xf0 as mask for big endian.

Tested on s390x-linux.

1 files changed, 8 insertions, 1 deletions

diff --git a/gdb/testsuite/gdb.ada/big_packed_array.exp b/gdb/testsuite/gdb.ada/big_packed_array.exp
index 33b1dfd..6f030f3 100644
--- a/gdb/testsuite/gdb.ada/big_packed_array.exp
+++ b/gdb/testsuite/gdb.ada/big_packed_array.exp
@@ -21,6 +21,8 @@ standard_ada_testfile foo_ra24_010
 
 set old_gcc [gnat_version_compare < 9]
 
+set endian [target_endianness]
+
 foreach_gnat_encoding scenario flags {all minimal} {
     lappend flags debug
 
@@ -54,8 +56,13 @@ foreach_gnat_encoding scenario flags {all minimal} {
        }
        -re -wrap $re_xfail2 {
 	   set last $expect_out(1,string)
+	   if { $endian == "little" } {
+	       set mask 0x0f
+	   } else {
+	       set mask 0xf0
+	   }
            if { $have_xfail && [string is integer $last] \
-		    && [expr ($last & 0xf) == 0] } {
+		    && [expr ($last & $mask) == 0] } {
                # gcc/101643
                setup_xfail *-*-*
            }