Eliminate 'unused but set variable' gcc warning in cpptest

(fix of commit e870802a1)

* tests/cpp.cc (main): Pass xio, d, a local variables to
GC_reachable_here().

1 files changed, 3 insertions, 3 deletions

diff --git a/tests/cpp.cc b/tests/cpp.cc
index dc0c9929..040df4ef 100644
--- a/tests/cpp.cc
+++ b/tests/cpp.cc
@@ -314,7 +314,7 @@ void* Undisguise( GC_word i ) {
     int *x = gc_allocator<int>().allocate(1);
     int *xio;
     xio = gc_allocator_ignore_off_page<int>().allocate(1);
-    (void)xio;
+    GC_reachable_here(xio);
     int **xptr = traceable_allocator<int *>().allocate(1);
     *x = 29;
     if (!xptr) {
@@ -353,7 +353,7 @@ void* Undisguise( GC_word i ) {
             D* d;
             F* f;
             d = ::new (USE_GC, D::CleanUp, (void*)(GC_word)i) D( i );
-            (void)d;
+            GC_reachable_here(d);
             f = new F;
             F** fa = new F*[1];
             fa[0] = f;
@@ -369,7 +369,7 @@ void* Undisguise( GC_word i ) {
         for (i = 0; i < 1000000; i++) {
             A* a;
             a = new (USE_GC) A( i );
-            (void)a;
+            GC_reachable_here(a);
             B* b;
             b = new B( i );
             (void)b;