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, 6 insertions, 4 deletions

diff --git a/dbg_mlc.c b/dbg_mlc.c
index d09f309b..bf24aa35 100644
--- a/dbg_mlc.c
+++ b/dbg_mlc.c
@@ -619,13 +619,15 @@ STATIC void * GC_debug_generic_malloc(size_t lb, int knd, GC_EXTRA_PARAMS)
   }
 #endif /* DBG_HDRS_ALL */
 
-GC_API void * GC_CALL GC_debug_malloc_stubborn(size_t lb, GC_EXTRA_PARAMS)
-{
+#ifndef CPPCHECK
+  GC_API void * GC_CALL GC_debug_malloc_stubborn(size_t lb, GC_EXTRA_PARAMS)
+  {
     return GC_debug_malloc(lb, OPT_RA s, i);
-}
+  }
 
-GC_API void GC_CALL GC_debug_change_stubborn(
+  GC_API void GC_CALL GC_debug_change_stubborn(
                                 const void * p GC_ATTR_UNUSED) {}
+#endif /* !CPPCHECK */
 
 GC_API void GC_CALL GC_debug_end_stubborn_change(const void *p)
 {