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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
44 lines
1,020 B
C++
44 lines
1,020 B
C++
#ifndef ONIGURUMA_REGEX_H /*-*-C++-*-vi:se ft=cpp:*/
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#define ONIGURUMA_REGEX_H 1
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/**
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* @file
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* @author $Author$
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* @copyright Copyright (C) 1993-2007 Yukihiro Matsumoto
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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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#if defined(__cplusplus)
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extern "C" {
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#if 0
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} /* satisfy cc-mode */
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#endif
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#endif
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#ifdef RUBY
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#include "ruby/oniguruma.h"
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#else
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#include "oniguruma.h"
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#endif
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RUBY_SYMBOL_EXPORT_BEGIN
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#ifndef ONIG_RUBY_M17N
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ONIG_EXTERN OnigEncoding OnigEncDefaultCharEncoding;
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#define mbclen(p,e,enc) rb_enc_mbclen((p),(e),(enc))
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#endif /* ifndef ONIG_RUBY_M17N */
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RUBY_SYMBOL_EXPORT_END
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#if defined(__cplusplus)
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#if 0
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{ /* satisfy cc-mode */
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#endif
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} /* extern "C" { */
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#endif
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#endif /* ONIGURUMA_REGEX_H */
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