nexmon – Rev 1
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/*
* Cross platform defines for exporting symbols from shared libraries
*
* Wireshark - Network traffic analyzer
* By Balint Reczey <balint@balintreczey.hu>
* Copyright 2013 Balint Reczey
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/** 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 http://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 __GNUC__
/* GCC */
#define WS_DLL_PUBLIC_DEF __attribute__ ((dllimport))
#elif ! (defined 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)
#else /* ! __GNUC__ && ENABLE_STATIC */
/*
* Presumably MSVC, and we're building all-static, so we're
* not building any DLLs.
*/
#define WS_DLL_PUBLIC_DEF
#endif /* __GNUC__ */
#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 claims compatibility
* with GCC 4 or later.
*/
#if __GNUC__ >= 4
/*
* 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")))
#else /* ! __GNUC__ >= 4 */
/*
* We have no way to make stuff not explicitly marked as
* visible invisible outside a library, but we might have
* a way to make stuff explicitly marked as local invisible
* outside the library.
*
* This was lifted from GLib; see above for why we don't use
* G_GNUC_INTERNAL.
*/
#if defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)
/* This supports GCC-style __attribute__ ((visibility (XXX))) */
#define WS_DLL_PUBLIC_DEF __attribute__ ((visibility ("default")))
#define WS_DLL_LOCAL __attribute__ ((visibility ("hidden")))
#elif defined(__SUNPRO_C) && (__SUNPRO_C >= 0x550)
/* This doesn't, but supports __global and __hidden */
#define WS_DLL_PUBLIC_DEF __global
#define WS_DLL_LOCAL __hidden
#else /* not Sun C with "hidden" support */
#define WS_DLL_PUBLIC_DEF
#define WS_DLL_LOCAL
#endif
#endif /* __GNUC__ >= 4 */
#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
#endif /* SYMBOL_EXPORT_H */
/*
* Editor modelines - http://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:
*/