mirror of https://github.com/fltk/fltk
107 lines
2.3 KiB
C
107 lines
2.3 KiB
C
/*
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* Function attribute declarations for the Fast Light Tool Kit (FLTK).
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*
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* Copyright 1998-2023 by Bill Spitzak and others.
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*
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* This library is free software. Distribution and use rights are outlined in
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* the file "COPYING" which should have been included with this file. If this
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* file is missing or damaged, see the license at:
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*
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* https://www.fltk.org/COPYING.php
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*
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* Please see the following page on how to report bugs and issues:
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*
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* https://www.fltk.org/bugs.php
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*/
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/**
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\file fl_attr.h
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This file defines compiler-specific macros
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*/
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#ifndef _FL_fl_attr_h_
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#define _FL_fl_attr_h_
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#ifdef FL_DOXYGEN
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/**
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This macro makes it safe to use the C++11 keyword \c override with
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older compilers.
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*/
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#define FL_OVERRIDE override
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/** To be used in prototypes with a variable list of arguments.
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This macro helps detection of mismatches between format string and
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argument list at compilation time.
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Usage example: FL/fl_ask.H
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*/
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#define __fl_attr(x)
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#else
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/*
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The GNUC-specific attribute appearing below in prototypes with a variable
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list of arguments helps detection of mismatches between format string and
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argument list at compilation time.
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Examples: see fl_ask.H
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*/
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#ifdef __GNUC__
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# define __fl_attr(x) __attribute__ (x)
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#else
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# define __fl_attr(x)
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#endif
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#ifdef __cplusplus
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// Visual Studio defines __cplusplus = '199711L' which is not helpful.
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// We assume that Visual Studio 2015 (1900) and later support the
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// 'override' keyword. For VS version number encoding see:
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// https://learn.microsoft.com/en-us/cpp/preprocessor/predefined-macros
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#if defined(_MSC_VER) && (_MSC_VER >= 1900)
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#define FL_OVERRIDE override
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#else // not Visual Studio or an older version
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#if (__cplusplus >= 202002L)
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// put here definitions applying to C++20 and above
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#endif
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#if (__cplusplus >= 201703L)
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// put here definitions applying to C++17 and above
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#endif
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#if (__cplusplus >= 201402L)
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// put here definitions applying to C++14 and above
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#endif
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#if (__cplusplus >= 201103L)
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// put here definitions applying to C++11 and above
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#define FL_OVERRIDE override
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#else
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// replace non-existing `override` with no-op
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#define FL_OVERRIDE
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#endif
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#if (__cplusplus >= 199711L)
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// put here definitions applying to C++98 and above
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#endif
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#endif /* not Visual Studio */
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#else
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/* C, not C++ */
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#endif /* __cplusplus */
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#endif /* FL_DOXYGEN */
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#endif /* !_FL_fl_attr_h_ */
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