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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
26 lines
870 B
C++
26 lines
870 B
C++
#ifndef RUBYSIG_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RUBYSIG_H
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/**
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* @file
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* @author $Author$
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* @date Wed Aug 16 01:15:38 JST 1995
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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#warning rubysig.h is obsolete
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#elif defined _MSC_VER
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#pragma message("warning: rubysig.h is obsolete")
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#endif
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#include "ruby/ruby.h"
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#define RUBY_CRITICAL(statements) do {statements;} while (0)
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#define DEFER_INTS (0)
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#define ENABLE_INTS (1)
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#define ALLOW_INTS do {CHECK_INTS;} while (0)
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#define CHECK_INTS rb_thread_check_ints()
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#endif /* RUBYSIG_H */
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