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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
63 lines
2.6 KiB
C++
63 lines
2.6 KiB
C++
#ifndef RUBY_BACKWARD2_LONG_LONG_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RUBY_BACKWARD2_LONG_LONG_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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* @warning Symbols prefixed with either `RUBY3` or `ruby3` are
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* implementation details. Don't take them as canon. They could
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* rapidly appear then vanish. The name (path) of this header file
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* is also an implementation detail. Do not expect it to persist
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* at the place it is now. Developers are free to move it anywhere
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* anytime at will.
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* @note To ruby-core: remember that this header can be possibly
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* recursively included from extension libraries written in C++.
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* Do not expect for instance `__VA_ARGS__` is always available.
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* We assume C99 for ruby itself but we don't assume languages of
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* extension libraries. They could be written in C++98.
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* @brief Defines old #LONG_LONG
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*
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* No known compiler that can compile today's ruby lacks long long.
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* Historically MSVC was one of such compiler, but it implemented long long a
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* while ago (some time back in 2013). The macros are for backwards
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* compatibility only.
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*/
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#include "ruby/3/config.h"
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#if RUBY3_HAS_WARNING("-Wc++11-long-long")
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# define HAVE_TRUE_LONG_LONG 1
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# define LONG_LONG \
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RUBY3_WARNING_PUSH() \
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RUBY3_WARNING_IGNORED(-Wc++11-long-long) \
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long long \
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RUBY3_WARNING_POP()
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#elif RUBY3_HAS_WARNING("-Wlong-long")
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# define HAVE_TRUE_LONG_LONG 1
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# define LONG_LONG \
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RUBY3_WARNING_PUSH() \
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RUBY3_WARNING_IGNORED(-Wlong-long) \
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long long \
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RUBY3_WARNING_POP()
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#elif defined(HAVE_LONG_LONG)
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# define HAVE_TRUE_LONG_LONG 1
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# define LONG_LONG long long
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#elif SIZEOF___INT64 > 0
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# define HAVE_LONG_LONG 1
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# define LONG_LONG __int64
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# undef SIZEOF_LONG_LONG
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# define SIZEOF_LONG_LONG SIZEOF___INT64
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#else
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# error Hello! Ruby developers believe this message must not happen.
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# error If you encounter this message, can you file a bug report?
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# error Remember to attach a detailed description of your environment.
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# error Thank you!
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#endif
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#endif /* RUBY3_BACKWARD2_LONG_LONG_H */
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