778e736ad6
svn path=/trunk/; revision=51376
147 lines
4.6 KiB
C
147 lines
4.6 KiB
C
/*
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* Cross platform defines for exporting symbols from shared libraries
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Balint Reczey <balint@balintreczey.hu>
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* Copyright 2013 Balint Reczey
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/** Reset symbol export behavior.
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* If you {un}define WS_BUILD_DLL on the fly you'll have to define this
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* as well.
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*/
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#ifdef RESET_SYMBOL_EXPORT
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#ifdef SYMBOL_EXPORT_H
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#undef SYMBOL_EXPORT_H
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#endif
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#ifdef WS_DLL_PUBLIC
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#undef WS_DLL_PUBLIC
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#endif
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#ifdef WS_DLL_PUBLIC_DEF
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#undef WS_DLL_PUBLIC_DEF
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#endif
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#ifdef WS_DLL_LOCAL
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#undef WS_DLL_LOCAL
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#endif
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#endif /* RESET_SYMBOL_EXPORT */
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#ifndef SYMBOL_EXPORT_H
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#define SYMBOL_EXPORT_H
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/* Originally copied from GCC Wiki at http://gcc.gnu.org/wiki/Visibility */
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#if defined _WIN32 || defined __CYGWIN__
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/* Compiling for Windows, so we use the Windows DLL declarations. */
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#ifdef WS_BUILD_DLL
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/*
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* Building a DLL; for all definitions, we want dllexport, and
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* (presumably so source from DLL and source from a program using the
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* DLL can both include a header that declares APIs and exported data
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* for the DLL), for declarations, either dllexport or dllimport will
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* work (they mean the same thing for a declaration when building a DLL).
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*/
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#ifdef __GNUC__
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/* GCC */
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#define WS_DLL_PUBLIC_DEF __attribute__ ((dllexport))
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#else /* ! __GNUC__ */
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/*
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* Presumably MSVC.
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* Note: actually gcc seems to also support this syntax.
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*/
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#define WS_DLL_PUBLIC_DEF __declspec(dllexport)
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#endif /* __GNUC__ */
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#else /* WS_BUILD_DLL */
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/*
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* Building a program; we should only see declarations, not definitions,
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* with WS_DLL_PUBLIC, and they all represent APIs or data imported
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* from a DLL, so use dllimport.
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*
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* For functions, export shouldn't be necessary; for data, it might
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* be necessary, e.g. if what's declared is an array whose size is
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* not given in the declaration.
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*/
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#ifdef __GNUC__
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/* GCC */
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#define WS_DLL_PUBLIC_DEF __attribute__ ((dllimport))
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#elif ! (defined ENABLE_STATIC) /* ! __GNUC__ */
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/*
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* Presumably MSVC, and we're not building all-static.
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* Note: actually gcc seems to also support this syntax.
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*/
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#define WS_DLL_PUBLIC_DEF __declspec(dllimport)
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#else /* ! __GNUC__ && ENABLE_STATIC */
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/*
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* Presumably MSVC, and we're building all-static, so we're
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* not building any DLLs.
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*/
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#define WS_DLL_PUBLIC_DEF
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#endif /* __GNUC__ */
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#endif /* WS_BUILD_DLL */
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/*
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* Symbols in a DLL are *not* exported unless they're specifically
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* flagged as exported, so, for a non-static but non-exported
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* symbol, we don't have to do anything.
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*/
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#define WS_DLL_LOCAL
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#else /* defined _WIN32 || defined __CYGWIN__ */
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/*
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* Compiling for UN*X, where the dllimport and dllexport stuff
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* is neither necessary nor supported; just specify the
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* visibility if we have a compiler that claims compatibility
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* with GCC 4 or later.
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*/
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#if __GNUC__ >= 4
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/*
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* Symbols exported from libraries.
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*/
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#define WS_DLL_PUBLIC_DEF __attribute__ ((visibility ("default")))
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/*
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* Non-static symbols *not* exported from libraries.
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*/
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#define WS_DLL_LOCAL __attribute__ ((visibility ("hidden")))
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#else /* ! __GNUC__ >= 4 */
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/*
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* We have no way to control visibility.
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*/
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#define WS_DLL_PUBLIC_DEF
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#define WS_DLL_LOCAL
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#endif /* __GNUC__ >= 4 */
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#endif
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/*
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* You *must* use this for exported data *declarations*; if you use
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* WS_DLL_PUBLIC_DEF, some compilers, such as MSVC++, will complain
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* about array definitions with no size.
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*
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* You must *not* use this for exported data *definitions*, as that
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* will, for some compilers, cause warnings about items being initialized
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* and declared extern.
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*
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* Either can be used for exported *function* declarations and definitions.
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*/
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#define WS_DLL_PUBLIC WS_DLL_PUBLIC_DEF extern
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#endif /* SYMBOL_EXPORT_H */
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