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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
28 lines
1.2 KiB
C
28 lines
1.2 KiB
C
#ifndef INTERNAL_ENCODING_H /*-*-C-*-vi:se ft=c:*/
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#define INTERNAL_ENCODING_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/ruby.h" /* for ID */
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#include "ruby/encoding.h" /* for rb_encoding */
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/* encoding.c */
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ID rb_id_encoding(void);
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rb_encoding *rb_enc_get_from_index(int index);
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rb_encoding *rb_enc_check_str(VALUE str1, VALUE str2);
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int rb_encdb_replicate(const char *alias, const char *orig);
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int rb_encdb_alias(const char *alias, const char *orig);
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int rb_encdb_dummy(const char *name);
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void rb_encdb_declare(const char *name);
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void rb_enc_set_base(const char *name, const char *orig);
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int rb_enc_set_dummy(int index);
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void rb_encdb_set_unicode(int index);
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PUREFUNC(int rb_data_is_encoding(VALUE obj));
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#endif /* INTERNAL_ENCODING_H */
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