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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
24 lines
877 B
C
24 lines
877 B
C
#ifndef INTERNAL_SERIAL_H /*-*-C-*-vi:se ft=c:*/
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#define INTERNAL_SERIAL_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 rb_serial_t.
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*/
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#include "ruby/3/config.h" /* for HAVE_LONG_LONG */
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#include "ruby/defines.h" /* for LONG_LONG */
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#ifndef HAVE_LONG_LONG
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# error need C99+
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#endif
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typedef unsigned LONG_LONG rb_serial_t;
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#define SERIALT2NUM ULL2NUM
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#define PRI_SERIALT_PREFIX PRI_LL_PREFIX
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#define SIZEOF_SERIAL_T SIZEOF_LONG_LONG
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#endif /* INTERNAL_SERIAL_H */
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