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xptc_gcc_x86_unix.h
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00001 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1999
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either of the GNU General Public License Version 2 or later (the "GPL"),
00026  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
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00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 /* Special include file for xptc*_gcc_x86_unix.cpp */
00039 
00040 // 
00041 // this may improve the static function calls, but may not.
00042 //
00043 
00044 // #define MOZ_USE_STDCALL
00045 
00046 #ifdef MOZ_USE_STDCALL
00047 #define ATTRIBUTE_STDCALL __attribute__ ((__stdcall__))
00048 #else
00049 #define ATTRIBUTE_STDCALL
00050 #endif
00051 
00052 #ifdef MOZ_NEED_LEADING_UNDERSCORE
00053 #define SYMBOL_UNDERSCORE "_"
00054 #else
00055 #define SYMBOL_UNDERSCORE
00056 #endif
00057 
00058 /*
00059   What are those keeper functions?
00060 
00061   The problem: gcc doesn't know that the assembler routines call
00062   static functions so gcc may not emit the definition (i.e., the
00063   code) for these functions. In gcc 3.1 and up
00064     "__attribute__ ((used))" exists and solves the problem.
00065   For older gcc versions it's not so easy. One could use the
00066   -fkeep-inline-functions but that keeps a surprising number of
00067   functions which bloats the compiled library. It seems otherwise
00068   harmless, though. Alternatively, one could use
00069   -fno-inline-functions which works right now but might cause a
00070   slowdown under some circumstances. The problem with these methods
00071   is that they do not automatically adapt to the compiler used.
00072 
00073   The best solution seems to be to create dummy functions that
00074   reference the appropriate static functions. It's then necessary
00075   to "use" these functions in a way that gcc will not optimize
00076   away. The keeper functions use assembly code to confuse gcc.
00077 
00078   One drawback is that the keeper functions are externally visible
00079   so they shouldn't do anything harmful.
00080 
00081   With the right linker, one could make the keeper functions local
00082   so they wouldn't be visible.
00083  */
00084 
00085 
00086 // gcc 3.1 and up
00087 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
00088 #define ATTRIBUTE_USED __attribute__ ((__used__))
00089 #else
00090 #define ATTRIBUTE_USED
00091 #endif
00092