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Define OPENSSL_EXPORT and OPENSSL_IMPORT and give OPENSSL_EXTERN the

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default value OPENSSL_IMPORT.  Explain the use of all those macros.
This commit is contained in:
Richard Levitte 2000-12-31 00:15:57 +00:00
parent f09628e42f
commit 21cd437886
1 changed files with 27 additions and 8 deletions
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35
e_os2.h
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@ -17,22 +17,41 @@ extern "C" {
# define OPENSSL_DECLARE_EXIT /* declared in unistd.h */
#endif
/* 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. On other OS:es,
these macros are defined with something sensible. */
/* 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(VMS) && !defined(__DECC)
# define OPENSSL_EXTERN globalref
# define OPENSSL_EXPORT globalref
# define OPENSSL_IMPORT globalref
# define OPENSSL_GLOBAL globaldef
#elif defined(WINDOWS)
# define OPENSSL_EXPORT extern _declspec(dllexport)
# define OPENSSL_IMPORT extern _declspec(dllimport)
# define OPENSSL_GLOBAL
#else
# define OPENSSL_EXTERN extern
# define OPENSSL_EXPORT extern
# define OPENSSL_IMPORT extern
# define OPENSSL_GLOBAL
#endif
#define OPENSSL_EXTERN OPENSSL_IMPORT
#ifdef __cplusplus
}
#endif
#endif