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ruby34
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dllexport.h
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#ifndef RBIMPL_DLLEXPORT_H /*-*-C++-*-vi:se ft=cpp:*/ #define RBIMPL_DLLEXPORT_H /** * @file * @author Ruby developers <ruby-core@ruby-lang.org> * @copyright This file is a part of the programming language Ruby. * Permission is hereby granted, to either redistribute and/or * modify this file, provided that the conditions mentioned in the * file COPYING are met. Consult the file for details. * @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are * implementation details. Don't take them as canon. They could * rapidly appear then vanish. The name (path) of this header file * is also an implementation detail. Do not expect it to persist * at the place it is now. Developers are free to move it anywhere * anytime at will. * @note To ruby-core: remember that this header can be possibly * recursively included from extension libraries written in C++. * Do not expect for instance `__VA_ARGS__` is always available. * We assume C99 for ruby itself but we don't assume languages of * extension libraries. They could be written in C++98. * @brief Tweaking visibility of C variables/functions. */ #include "ruby/internal/config.h" #include "ruby/internal/compiler_is.h" /** * Declaration of externally visible global variables. Here "externally" means * they should be visible from extension libraries. Depending on operating * systems (dynamic linkers, to be precise), global variables inside of a DLL * may or may not be visible form outside of that DLL by default. This * declaration manually tweaks that default and ensures the declared variable * be truly globally visible. * * ```CXX * extern VALUE foo; // hidden on some OS * RUBY_EXTERN VALUE foo; // ensure visible * ``` */ #undef RUBY_EXTERN #if defined(RUBY_EXPORT) # define RUBY_EXTERN extern #elif defined(_WIN32) # define RUBY_EXTERN extern __declspec(dllimport) #else # define RUBY_EXTERN extern #endif #ifndef RUBY_SYMBOL_EXPORT_BEGIN # define RUBY_SYMBOL_EXPORT_BEGIN /* begin */ #endif #ifndef RUBY_SYMBOL_EXPORT_END # define RUBY_SYMBOL_EXPORT_END /* end */ #endif #ifndef RUBY_FUNC_EXPORTED # define RUBY_FUNC_EXPORTED /* void */ #endif /** @endcond */ /** Shortcut macro equivalent to `RUBY_SYMBOL_EXPORT_BEGIN extern "C" {`. * \@shyouhei finds it handy. */ #if defined(__DOXYGEN__) # define RBIMPL_SYMBOL_EXPORT_BEGIN() /* void */ #elif defined(__cplusplus) # define RBIMPL_SYMBOL_EXPORT_BEGIN() RUBY_SYMBOL_EXPORT_BEGIN extern "C" { #else # define RBIMPL_SYMBOL_EXPORT_BEGIN() RUBY_SYMBOL_EXPORT_BEGIN #endif /** Counterpart of #RBIMPL_SYMBOL_EXPORT_BEGIN */ #if defined(__DOXYGEN__) # define RBIMPL_SYMBOL_EXPORT_END() /* void */ #elif defined(__cplusplus) # define RBIMPL_SYMBOL_EXPORT_END() } RUBY_SYMBOL_EXPORT_END #else # define RBIMPL_SYMBOL_EXPORT_END() RUBY_SYMBOL_EXPORT_END #endif #endif /* RBIMPL_DLLEXPORT_H */