mr4th-dynamic-linking/xlist/base.h

// baby context cracking

#if defined(_WIN32)
# define OS_WINDOWS 1
#elif defined(__gnu_linux__)
# define OS_LINUX 1
#else
# error this configuration of compiler & OS is not supported
#endif

#if !defined(OS_WINDOWS)
# define OS_WINDOWS 0
#endif
#if !defined(OS_LINUX)
# define OS_LINUX 0
#endif


// linkage keyword abstraction

#if OS_WINDOWS
# define EXPORT_SYMBOL __declspec(dllexport)
#elif OS_LINUX
# define EXPORT_SYMBOL __attribute__ ((visibility ("default")))
#else
# error keyword abstractions missing for this OS
#endif


// before-main abstraction

#if OS_WINDOWS

# pragma section(".CRT$XCU", read)

# define BEFORE_MAIN(n) static void n(void); \
__declspec(allocate(".CRT$XCU"))            \
__declspec(dllexport)                       \
void (*n##__)(void) = n;                    \
static void n(void)

#elif OS_LINUX

# define BEFORE_MAIN(n) \
__attribute__((constructor)) static void n(void)

#else
# error BEFORE_MAIN missing for this OS
#endif


// base symbols shared

#if defined(BASE_IMPLEMENTOR)

void base_func(void);

#endif


// dynamic function linkage protocol

typedef struct BASE_Funcs{
#define X(N,R,P) R (*N) P;
#include "base.xlist.h"
#undef X
} BASE_Funcs;

typedef BASE_Funcs* BASE_ExportFuncs(void);

#if defined(BASE_IMPLEMENTOR)
EXPORT_SYMBOL BASE_Funcs* base_export_functions(void);
#endif

#if !defined(BASE_IMPLEMENTOR)
#define X(N,R,P) R (*N) P = 0;
#include "base.xlist.h"
#undef X
#endif