Fix linkage of javaxfc.h symbols for the case of compilation as C++ code

Issue #206 (bdwgc).

The functions should be declared (as extern "C") before the definition.

* finalize.c [!GC_NO_FINALIZATION]: Include javaxfc.h.
* pthread_stop_world.c [GC_ENABLE_SUSPEND_THREAD]: Likewise.

1 files changed, 1 insertions, 0 deletions

diff --git a/finalize.c b/finalize.c
index 640ee4e7..6f178b9d 100644
--- a/finalize.c
+++ b/finalize.c
@@ -17,6 +17,7 @@
 #include "private/gc_pmark.h"
 
 #ifndef GC_NO_FINALIZATION
+# include "javaxfc.h" /* to get GC_finalize_all() as extern "C" */
 
 /* Type of mark procedure used for marking from finalizable object.     */
 /* This procedure normally does not mark the object, only its           */