[PATCH,committed] fix watch_thread_num.exp without hardware breakpoints

[Nathan Froyd <froydnj at codesourcery dot com>]

When this patch:

http://sourceware.org/ml/gdb-patches/2007-12/msg00296.html

was being discussed, Daniel suggested that the test should be modified
to take into gdb,no_hardware_watchpoints:

http://sourceware.org/ml/gdb-patches/2007-12/msg00304.html

but the patch went in without making such modifications.

This patch adds such checks.  Tested with a remote powerpc-linux-gnu
target, where it fixes several timeout FAILs.  Approved offline by
Daniel and committed.

-Nathan

gdb/testsuite/
2008-05-13  Nathan Froyd  <froydnj@codesourcery.com>

	* gdb.base/watch_thread_num.exp: Don't run tests that require
	watchpoints if the target doesn't support them.

Index: gdb/testsuite/gdb.base/watch_thread_num.exp
===================================================================
--- gdb/testsuite/gdb.base/watch_thread_num.exp	(revision 207605)
+++ gdb/testsuite/gdb.base/watch_thread_num.exp	(working copy)
@@ -72,9 +72,15 @@ gdb_test "watch shared_var thread $threa
 gdb_test "info breakpoint 3" "stop only in thread $thread_num"
 
 for {set i 1} {$i <= 10} {incr i 1} {
-gdb_test "continue" "Hardware watchpoint 3: shared_var.*" \
-  "Watchpoint triggered iteration $i"
-gdb_test "thread" ".*Current thread is $thread_num .*" \
-  "Check thread that triggered iteration $i"
+    set watchpoint "Watchpoint triggered iteration $i"
+    set check "Check thread that triggered iteration $i"
+
+    if {[target_info exists gdb,no_hardware_watchpoints]} {
+        unsupported $watchpoint
+        unsupported $check
+    } else {
+        gdb_test "continue" "Hardware watchpoint 3: shared_var.*" $watchpoint
+        gdb_test "thread" ".*Current thread is $thread_num .*" $check
+    }
 }