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/** @file
* Cross platform defines for exporting symbols from shared libraries
*
* Wireshark - Network traffic analyzer
* By Balint Reczey <balint@balintreczey.hu>
* Copyright 2013 Balint Reczey
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "ws_compiler_tests.h"
/** Reset symbol export behavior.
* If you {un}define WS_BUILD_DLL on the fly you'll have to define this
* as well.
*/
#ifdef RESET_SYMBOL_EXPORT
#ifdef SYMBOL_EXPORT_H
#undef SYMBOL_EXPORT_H
#endif
#ifdef WS_DLL_PUBLIC
#undef WS_DLL_PUBLIC
#endif
#ifdef WS_DLL_PUBLIC_DEF
#undef WS_DLL_PUBLIC_DEF
#endif
#ifdef WS_DLL_LOCAL
#undef WS_DLL_LOCAL
#endif
#endif /* RESET_SYMBOL_EXPORT */
#ifndef SYMBOL_EXPORT_H
#define SYMBOL_EXPORT_H
/*
* NOTE: G_HAVE_GNUC_VISIBILITY is defined only if all of
*
* __attribute__ ((visibility ("hidden")))
*
* __attribute__ ((visibility ("internal")))
*
* __attribute__ ((visibility ("protected")))
*
* __attribute__ ((visibility ("default")))
*
* are supported, and at least some versions of GCC from Apple support
* "default" and "hidden" but not "internal" or "protected", so it
* shouldn't be used to determine whether "hidden" or "default" is
* supported.
*
* This also means that we shouldn't use G_GNUC_INTERNAL instead of
* WS_DLL_LOCAL, as GLib uses G_HAVE_GNUC_VISIBILITY to determine
* whether to use __attribute__ ((visibility ("hidden"))) for
* G_GNUC_INTERNAL, and that will not use it even with compilers
* that support it.
*/
/* Originally copied from GCC Wiki at https://gcc.gnu.org/wiki/Visibility */
#if defined _WIN32 || defined __CYGWIN__
/* Compiling for Windows, so we use the Windows DLL declarations. */
#ifdef WS_BUILD_DLL
/*
* Building a DLL; for all definitions, we want dllexport, and
* (presumably so source from DLL and source from a program using the
* DLL can both include a header that declares APIs and exported data
* for the DLL), for declarations, either dllexport or dllimport will
* work (they mean the same thing for a declaration when building a DLL).
*/
#ifdef __GNUC__
/* GCC */
#define WS_DLL_PUBLIC_DEF __attribute__ ((dllexport))
#else /* ! __GNUC__ */
/*
* Presumably MSVC.
* Note: actually gcc seems to also support this syntax.
*/
#define WS_DLL_PUBLIC_DEF __declspec(dllexport)
#endif /* __GNUC__ */
#else /* WS_BUILD_DLL */
/*
* Building a program; we should only see declarations, not definitions,
* with WS_DLL_PUBLIC, and they all represent APIs or data imported
* from a DLL, so use dllimport.
*
* For functions, export shouldn't be necessary; for data, it might
* be necessary, e.g. if what's declared is an array whose size is
* not given in the declaration.
*/
#ifdef ENABLE_STATIC
/*
* We're building all-static, so we're not building any DLLs.
*/
#define WS_DLL_PUBLIC_DEF
#elif defined(__GNUC__)
/* GCC */
#define WS_DLL_PUBLIC_DEF __attribute__ ((dllimport))
#else /* ! ENABLE_STATIC && ! __GNUC__ */
/*
* Presumably MSVC, and we're not building all-static.
* Note: actually gcc seems to also support this syntax.
*/
#define WS_DLL_PUBLIC_DEF __declspec(dllimport)
#endif
#endif /* WS_BUILD_DLL */
/*
* Symbols in a DLL are *not* exported unless they're specifically
* flagged as exported, so, for a non-static but non-exported
* symbol, we don't have to do anything.
*/
#define WS_DLL_LOCAL
#else /* defined _WIN32 || defined __CYGWIN__ */
/*
* Compiling for UN*X, where the dllimport and dllexport stuff
* is neither necessary nor supported; just specify the
* visibility if we have a compiler that supports doing so.
*/
#if WS_IS_AT_LEAST_GNUC_VERSION(3,4) \
|| WS_IS_AT_LEAST_XL_C_VERSION(12,0)
/*
* GCC 3.4 or later, or some compiler asserting compatibility with
* GCC 3.4 or later, or XL C 13.0 or later, so we have
* __attribute__((visibility()).
*/
/*
* Symbols exported from libraries.
*/
#define WS_DLL_PUBLIC_DEF __attribute__ ((visibility ("default")))
/*
* Non-static symbols *not* exported from libraries.
*/
#define WS_DLL_LOCAL __attribute__ ((visibility ("hidden")))
#elif WS_IS_AT_LEAST_SUNC_VERSION(5,5)
/*
* Sun C 5.5 or later, so we have __global and __hidden.
* (Sun C 5.9 and later also have __attribute__((visibility()),
* but there's no reason to prefer it with Sun C.)
*/
/*
* Symbols exported from libraries.
*/
#define WS_DLL_PUBLIC_DEF __global
/*
* Non-static symbols *not* exported from libraries.
*/
#define WS_DLL_LOCAL __hidden
#else
/*
* We have neither a way to make stuff not explicitly marked as
* visible invisible outside a library nor a way to make stuff
* explicitly marked as local invisible outside the library.
*/
/*
* Symbols exported from libraries.
*/
#define WS_DLL_PUBLIC_DEF
/*
* Non-static symbols *not* exported from libraries.
*/
#define WS_DLL_LOCAL
#endif
#endif
/*
* You *must* use this for exported data *declarations*; if you use
* WS_DLL_PUBLIC_DEF, some compilers, such as MSVC++, will complain
* about array definitions with no size.
*
* You must *not* use this for exported data *definitions*, as that
* will, for some compilers, cause warnings about items being initialized
* and declared extern.
*
* Either can be used for exported *function* declarations and definitions.
*/
#define WS_DLL_PUBLIC WS_DLL_PUBLIC_DEF extern
/*
* This is necessary to export symbols from wsutil to another DLL
* (not an executable) using MSVC.
*/
#ifdef _MSC_VER
# ifdef BUILD_WSUTIL
# define WSUTIL_EXPORT __declspec(dllexport) extern
# else
# define WSUTIL_EXPORT __declspec(dllimport) extern
# endif
#else /* _MSC_VER */
# define WSUTIL_EXPORT WS_DLL_PUBLIC
#endif /* _MSC_VER */
#endif /* SYMBOL_EXPORT_H */
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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