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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
29 lines
1 KiB
C
29 lines
1 KiB
C
#ifndef INTERNAL_MJIT_H /*-*-C-*-vi:se ft=c:*/
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#define INTERNAL_MJIT_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 MJIT.
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*/
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#include "ruby/3/stdbool.h" /* for bool */
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#include "ruby/ruby.h" /* for VALUE */
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/* mjit.c */
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#if USE_MJIT
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extern bool mjit_enabled;
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VALUE mjit_pause(bool wait_p);
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VALUE mjit_resume(void);
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void mjit_finish(bool close_handle_p);
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#else
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#define mjit_enabled 0
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static inline VALUE mjit_pause(bool wait_p){ return Qnil; } // unreachable
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static inline VALUE mjit_resume(void){ return Qnil; } // unreachable
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static inline void mjit_finish(bool close_handle_p){}
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#endif
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#endif /* INTERNAL_MJIT_H */
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