69941f0586
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3796 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
61 lines
2.1 KiB
C
61 lines
2.1 KiB
C
/////////////////////////////////////////////////////////////////////////////
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// Name: forcelnk.h
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// Purpose: see bellow
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// Author: Vaclav Slavik
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// RCS-ID: $Id$
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// Copyright: (c) Vaclav Slavik
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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/*
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DESCRPITON:
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mod_*.cpp files contain handlers for tags. These files are modules - they contain
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one wxTagModule class and it's OnInit() method is called from wxApp's init method.
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The module is called even if you only link it into the executable, so everything
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seems wonderful.
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The problem is that we have these modules in LIBRARY and mod_*.cpp files contain
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no method nor class which is known out of the module. So the linker won't
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link these .o/.obj files into executable because it detected that it is not used
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by the program.
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To workaround this I introduced set of macros FORCE_LINK_ME and FORCE_LINK. These
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macros are generic and are not limited to mod_*.cpp files. You may find them quite
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useful somewhere else...
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How to use them:
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let's suppose you want to always link file foo.cpp and that you have module
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always.cpp that is certainly always linked (e.g. the one with main() function
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or htmlwin.cpp in wxHtml library).
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Place FORCE_LINK_ME(foo) somewhere in foo.cpp and FORCE_LINK(foo) somewhere
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in always.cpp
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See mod_*.cpp and htmlwin.cpp for example :-)
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*/
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#ifndef _WX_FORCELNK_H_
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#define _WX_FORCELNK_H_
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// This must be part of the module you want to force:
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#define FORCE_LINK_ME(module_name) \
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int _link_dummy_func_##module_name () \
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{ \
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return 1; \
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}
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// And this must be somewhere where it certainly will be linked:
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#define FORCE_LINK(module_name) \
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extern int _link_dummy_func_##module_name (); \
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static int _link_dummy_var_##module_name = \
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_link_dummy_func_##module_name ();
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#endif // _WX_FORCELNK_H_
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