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According to MSVC manual (*1), cl.exe can skip including a header file when that: - contains #pragma once, or - starts with #ifndef, or - starts with #if ! defined. GCC has a similar trick (*2), but it acts more stricter (e. g. there must be _no tokens_ outside of #ifndef...#endif). Sun C lacked #pragma once for a looong time. Oracle Developer Studio 12.5 finally implemented it, but we cannot assume such recent version. This changeset modifies header files so that each of them include strictly one #ifndef...#endif. I believe this is the most portable way to trigger compiler optimizations. [Bug #16770] *1: https://docs.microsoft.com/en-us/cpp/preprocessor/once *2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
#ifndef RUBY_VERSION_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RUBY_VERSION_H 1
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/**
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* @file
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* @author $Author$
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* @date Wed May 13 12:56:56 JST 2009
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* @copyright Copyright (C) 1993-2009 Yukihiro Matsumoto
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* @copyright Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
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* @copyright Copyright (C) 2000 Information-technology Promotion Agency, Japan
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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*
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* This file contains only
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* - never-changeable information, and
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* - interfaces accessible from extension libraries.
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*
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* Never try to check RUBY_VERSION_CODE etc in extension libraries,
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* check the features with mkmf.rb instead.
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*/
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/* The origin. */
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#define RUBY_AUTHOR "Yukihiro Matsumoto"
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#define RUBY_BIRTH_YEAR 1993
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#define RUBY_BIRTH_MONTH 2
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#define RUBY_BIRTH_DAY 24
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/* API version */
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#define RUBY_API_VERSION_MAJOR 2
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#define RUBY_API_VERSION_MINOR 8
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#define RUBY_API_VERSION_TEENY 0
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#define RUBY_API_VERSION_CODE (RUBY_API_VERSION_MAJOR*10000+RUBY_API_VERSION_MINOR*100+RUBY_API_VERSION_TEENY)
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#ifdef RUBY_EXTERN
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/* Internal note: this file could be included from verconf.mk _before_
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* generating config.h, on Windows. The #ifdef above is to trick such
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* situation. */
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RUBY3_SYMBOL_EXPORT_BEGIN()
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/*
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* Interfaces from extension libraries.
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*
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* Before using these infos, think thrice whether they are really
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* necessary or not, and if the answer was yes, think twice a week
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* later again.
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*/
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RUBY_EXTERN const int ruby_api_version[3];
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RUBY_EXTERN const char ruby_version[];
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RUBY_EXTERN const char ruby_release_date[];
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RUBY_EXTERN const char ruby_platform[];
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RUBY_EXTERN const int ruby_patchlevel;
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RUBY_EXTERN const char ruby_description[];
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RUBY_EXTERN const char ruby_copyright[];
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RUBY_EXTERN const char ruby_engine[];
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RUBY3_SYMBOL_EXPORT_END()
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#endif
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#endif
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