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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
27 lines
815 B
C++
27 lines
815 B
C++
#ifndef RUBY_SUBST_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RUBY_SUBST_H 1
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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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#undef snprintf
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#undef vsnprintf
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#define snprintf ruby_snprintf
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#define vsnprintf ruby_vsnprintf
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#ifdef BROKEN_CLOSE
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#undef getpeername
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#define getpeername ruby_getpeername
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#undef getsockname
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#define getsockname ruby_getsockname
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#undef shutdown
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#define shutdown ruby_shutdown
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#undef close
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#define close ruby_close
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#endif
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#endif
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