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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
31 lines
1.3 KiB
C
31 lines
1.3 KiB
C
#ifndef INTERNAL_UTIL_H /*-*-C-*-vi:se ft=c:*/
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#define INTERNAL_UTIL_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 corresponding util.c.
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* @warning DO NOT ADD RANDOM GARBAGE HERE THIS FILE IS FOR util.c
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*/
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#include "ruby/3/config.h"
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#include <stddef.h> /* for size_t */
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h> /* for ssize_t (note: on Windows ssize_t is */
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#endif /* `#define`d in ruby/config.h) */
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/* util.c */
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char *ruby_dtoa(double d_, int mode, int ndigits, int *decpt, int *sign, char **rve);
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char *ruby_hdtoa(double d, const char *xdigs, int ndigits, int *decpt, int *sign, char **rve);
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RUBY_SYMBOL_EXPORT_BEGIN
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/* util.c (export) */
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extern const signed char ruby_digit36_to_number_table[];
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extern const char ruby_hexdigits[];
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extern unsigned long ruby_scan_digits(const char *str, ssize_t len, int base, size_t *retlen, int *overflow);
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RUBY_SYMBOL_EXPORT_END
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#endif /* INTERNAL_UTIL_H */
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