* 修改编译方式为CMake

* 删除C++适配代码
* 修改编译告警

common/json/src/libjson.c

@@ -0,0 +1,26 @@
+
+/* dummy source file for compatibility purposes */
+
+#if defined(HAVE_CDEFS_H)
+#include <sys/cdefs.h>
+#endif
+
+#ifndef __warn_references
+
+#if defined(__GNUC__)  && defined (HAS_GNU_WARNING_LONG)
+
+#define __warn_references(sym,msg)                  \
+  __asm__(".section .gnu" #sym ",\n\t.ascii \"" msg "\"\n\t.text");
+
+#else
+#define __warn_references(sym,msg)    /* nothing */
+#endif
+
+#endif 
+
+#include "json_object.h"
+
+__warn_references(json_object_get, "Warning: please link against libjson-c instead of libjson");
+
+/*        __asm__(".section .gnu.warning." __STRING(sym)  \
+            " ; .ascii \"" msg "\" ; .text") */