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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
20 lines
725 B
C
20 lines
725 B
C
#ifndef INTERNAL_ENC_H /*-*-C-*-vi:se ft=c:*/
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#define INTERNAL_ENC_H
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/**
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* @file
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* @author Ruby developers <ruby-core@ruby-lang.org>
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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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* @brief Internal header for Encoding.
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*/
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#include "ruby/encoding.h" /* for rb_encoding */
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/* us_ascii.c */
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extern rb_encoding OnigEncodingUS_ASCII;
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/* utf_8.c */
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extern rb_encoding OnigEncodingUTF_8;
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#endif /* INTERNAL_ENC_H */
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