+/* Macros to allow global variables to be reached through function calls when
+ required (if a shared library version requvres it, for example.
+ The way it's done allows definitions like this:
+
+ // in foobar.c
+ OPENSSL_IMPLEMENT_GLOBAL(int,foobar) = 0;
+ // in foobar.h
+ OPENSSL_DECLARE_GLOBAL(int,foobar);
+ #define foobar OPENSSL_GLOBAL_REF(foobar)
+*/
+#ifdef OPENSSL_EXPORT_VAR_AS_FUNCTION
+# define OPENSSL_IMPLEMENT_GLOBAL(type,name) \
+ extern type _hide_##name; \
+ type *_shadow_##name(void) { return &_hide_##name; } \
+ static type _hide_##name
+# define OPENSSL_DECLARE_GLOBAL(type,name) type *_shadow_##name(void)
+# define OPENSSL_GLOBAL_REF(name) (*(_shadow_##name()))
+#else
+# define OPENSSL_IMPLEMENT_GLOBAL(type,name) OPENSSL_GLOBAL type _shadow_##name
+# define OPENSSL_DECLARE_GLOBAL(type,name) OPENSSL_EXPORT type _shadow_##name
+# define OPENSSL_GLOBAL_REF(name) _shadow_##name
+#endif
+