-/* Definitions of OPENSSL_GLOBAL and OPENSSL_EXTERN, to define and declare
- certain global symbols that, with some compilers under VMS, have to be
- defined and declared explicitely with globaldef and globalref.
- Definitions of OPENSSL_EXPORT and OPENSSL_IMPORT, to define and declare
- DLL exports and imports for compilers under Win32. These are a little
- more complicated to use. Basically, for any library that exports some
- global variables, the following code must be present in the header file
- that declares them, before OPENSSL_EXTERN is used:
-
- #ifdef SOME_BUILD_FLAG_MACRO
- # undef OPENSSL_EXTERN
- # define OPENSSL_EXTERN OPENSSL_EXPORT
- #endif
-
- The default is to have OPENSSL_EXPORT, OPENSSL_IMPORT and OPENSSL_GLOBAL
- have some generally sensible values, and for OPENSSL_EXTERN to have the
- value OPENSSL_IMPORT.
-*/
-
-#if defined(OPENSSL_SYS_VMS_NODECC)
-# define OPENSSL_EXPORT globalref
-# define OPENSSL_IMPORT globalref
-# define OPENSSL_GLOBAL globaldef
-#elif defined(OPENSSL_SYS_WINDOWS) && defined(OPENSSL_OPT_WINDLL)
-# define OPENSSL_EXPORT extern _declspec(dllexport)
-# define OPENSSL_IMPORT extern _declspec(dllimport)
-# define OPENSSL_GLOBAL
-#else
-# define OPENSSL_EXPORT extern
-# define OPENSSL_IMPORT extern
-# define OPENSSL_GLOBAL
-#endif
-#define OPENSSL_EXTERN OPENSSL_IMPORT
-
-/* 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) static 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