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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
25 lines
927 B
C++
25 lines
927 B
C++
#ifndef RUBY_BACKWARD_CLASSEXT_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RUBY_BACKWARD_CLASSEXT_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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*/
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#if defined __GNUC__
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#warning use of RClass internals is deprecated
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#elif defined _MSC_VER
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#pragma message("warning: use of RClass internals is deprecated")
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#endif
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typedef struct rb_deprecated_classext_struct {
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VALUE super;
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} rb_deprecated_classext_t;
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#undef RCLASS_SUPER(c)
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#define RCLASS_EXT(c) ((rb_deprecated_classext_t *)RCLASS(c)->ptr)
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#define RCLASS_SUPER(c) (RCLASS(c)->super)
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#endif /* RUBY_BACKWARD_CLASSEXT_H */
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