90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/*
|
|
* Use compiler specific key words to set up shareable library
|
|
* external symbols and entry points
|
|
*
|
|
* Right now this is only necessary for WIN32 DLL,
|
|
* the approach should be general enough for future systems, however.
|
|
*
|
|
*
|
|
* USAGE:
|
|
*
|
|
* In header files, declare variables, classes and functions
|
|
* to be __exported__ like this:
|
|
*
|
|
* epicsShareAPI int a_func (int arg); reference function
|
|
* epicsShareExtern int a_var; reference variable
|
|
* epicsShareDecl int a_var= 4; create variable instance
|
|
* class epicsShareClass a_class; reference a class
|
|
*
|
|
* Usually the epicsShare... macros expand to
|
|
* "import this from a DLL" (on WIN32, on Unix it's a NOP)
|
|
*
|
|
* In the implementation file, however, you write:
|
|
*
|
|
* #include <other_stuff.h>
|
|
* #define epicsExportSharedSymbols
|
|
* #include <what_I_implement.h>
|
|
* ! no more "foreign" includes from here on !
|
|
*
|
|
* The point is: define epicsExportSharedSymbols exacly and only
|
|
* right before you include the prototypes for what you implement!
|
|
* This time the epicsShare... macros expand to
|
|
* "export this from the DLL that we are building" (again only on WIN32)
|
|
*
|
|
* 8-22-96 -kuk-
|
|
*/
|
|
|
|
#undef epicsShareExtern
|
|
#undef epicsShareDecl
|
|
#undef epicsShareClass
|
|
#undef epicsShareAPI
|
|
#undef READONLY
|
|
|
|
#if defined(WIN32)
|
|
|
|
# if defined(epicsExportSharedSymbols)
|
|
# define epicsShareExtern __declspec(dllexport) extern
|
|
# define epicsShareClass __declspec(dllexport)
|
|
# else
|
|
# define epicsShareExtern __declspec(dllimport) extern
|
|
# define epicsShareClass __declspec(dllimport)
|
|
# endif
|
|
/*
|
|
* Subroutine removes arguments
|
|
*/
|
|
# define epicsShareAPI __stdcall
|
|
# define epicsShareDecl __declspec(dllexport)
|
|
# define READONLY const
|
|
|
|
#elif defined(VAXC)
|
|
|
|
/*
|
|
* VAXC creates FORTRAN common blocks when
|
|
* we use "extern int fred"/"int fred=4". Therefore,
|
|
* the initialization is not loaded unless we
|
|
* call a function in that object module.
|
|
*
|
|
* DEC CXX does not have this problem.
|
|
* We suspect (but do not know) that DEC C
|
|
* also does not have this problem.
|
|
*/
|
|
# define epicsShareExtern globalref
|
|
# define epicsShareDecl globaldef
|
|
# define READONLY const
|
|
#else
|
|
|
|
/* no WIN32 -> no import/export specifiers */
|
|
|
|
# define epicsShareExtern extern
|
|
# define epicsShareAPI
|
|
# define epicsShareClass
|
|
# define epicsShareDecl
|
|
# if defined(__STDC__)
|
|
# define READONLY const
|
|
# else
|
|
# define READONLY
|
|
# endif
|
|
|
|
#endif
|
|
|