Initial plan

tinyxml2.cpp

@@ -36,20 +36,38 @@ distribution.
 #ifndef __has_attribute
 #   define __has_attribute(x) 0
 #endif
-#ifndef __has_cpp_attribute
-#  define __has_cpp_attribute(x) 0
+#ifdef __cplusplus
+#   ifndef __has_cpp_attribute
+#      define __has_cpp_attribute(x) 0
+#   endif
+#else
+#   ifndef __has_c_attribute
+#      define __has_c_attribute(x) 0
+#   endif
 #endif
 
-#if defined(_MSC_VER)
-#   define TIXML_FALLTHROUGH (void(0))
-#elif (__cplusplus >= 201703L && __has_cpp_attribute(fallthrough))
-#   define TIXML_FALLTHROUGH [[fallthrough]]
-#elif __has_cpp_attribute(clang::fallthrough)
-#   define TIXML_FALLTHROUGH [[clang::fallthrough]]
-#elif __has_attribute(fallthrough)
-#   define TIXML_FALLTHROUGH __attribute__((fallthrough))
+#ifdef __cplusplus
+#   if defined(_MSC_VER)
+#      define TIXML_FALLTHROUGH (void(0))
+#   elif (__cplusplus >= 201703L && __has_cpp_attribute(fallthrough))
+#      define TIXML_FALLTHROUGH [[fallthrough]]
+#   elif __has_cpp_attribute(clang::fallthrough)
+#      define TIXML_FALLTHROUGH [[clang::fallthrough]]
+#   elif __has_attribute(fallthrough)
+#      define TIXML_FALLTHROUGH __attribute__((fallthrough))
+#   else
+#      define TIXML_FALLTHROUGH (void(0))
+#   endif
 #else
-#   define TIXML_FALLTHROUGH (void(0))
+#   if defined(_MSC_VER)
+#      define TIXML_FALLTHROUGH (void(0))
+#   elif __has_c_attribute(fallthrough)
+#      define TIXML_FALLTHROUGH [[fallthrough]]
+#   elif __has_attribute(fallthrough)
+#      define TIXML_FALLTHROUGH __attribute__((fallthrough))
+#   else
+#      define TIXML_FALLTHROUGH (void(0))
+#   endif
 #endif