Workaround '*_stubborn function is never used' cppcheck warnings

* dbg_mlc.c (GC_debug_malloc_stubborn, GC_debug_change_stubborn): Do
not define if CPPCHECK.
* mallocx.c (GC_malloc_stubborn, GC_end_stubborn_change): Likewise.
* include/gc.h (GC_debug_change_stubborn): Always mark as
GC_ATTR_DEPRECATED (regardless of CPPCHECK).
* tests/test.c [!PCR && !GC_WIN32_THREADS && !GC_PTHREADS && CPPCHECK]
(main): Remove UNTESTED(GC_debug_change_stubborn).

1 files changed, 10 insertions, 8 deletions

diff --git a/mallocx.c b/mallocx.c
index 9e93c707..1aa45699 100644
--- a/mallocx.c
+++ b/mallocx.c
@@ -610,15 +610,17 @@ GC_API GC_ATTR_MALLOC char * GC_CALL GC_strndup(const char *str, size_t size)
   }
 #endif /* GC_REQUIRE_WCSDUP */
 
-GC_API void * GC_CALL GC_malloc_stubborn(size_t lb)
-{
-  return GC_malloc(lb);
-}
+#ifndef CPPCHECK
+  GC_API void * GC_CALL GC_malloc_stubborn(size_t lb)
+  {
+    return GC_malloc(lb);
+  }
 
-GC_API void GC_CALL GC_change_stubborn(const void *p GC_ATTR_UNUSED)
-{
-  /* Empty. */
-}
+  GC_API void GC_CALL GC_change_stubborn(const void *p GC_ATTR_UNUSED)
+  {
+    /* Empty. */
+  }
+#endif /* !CPPCHECK */
 
 GC_API void GC_CALL GC_end_stubborn_change(const void *p)
 {