(l2g_start): Handle TRACED_ALLOCATIONS.

src/server/testsuite/config/unix.exp

@@ -78,6 +78,8 @@ proc l2g_start {} {
     global nl
     global expect_active
     global expect_always
+    global test
+    global MEMTRACE
 
     spawn $l2g
     set l2g_id $spawn_id
@@ -88,6 +90,21 @@ proc l2g_start {} {
 
     talk_to l2g
 
+    set test "starting l2g"
+    expect {
+	-re "^Where does the trace want to go today. .stderr.$nl" {
+	    pass "Tracing is activated ($MEMTRACE)"
+	    send "$MEMTRACE\n"
+	    continue -expect
+	}
+	-re "^l2g> " {
+	    pass "$test"
+	}
+    }
+    unset test
+    send "\n"
+    simple_expect "^EMPTY LINE" "noop command"
+
     if {$efence} {
 	l2g_send "I9"
 	l2g_send "a9 3 17"