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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
72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
#ifndef RUBY_UTIL_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RUBY_UTIL_H 1
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/**
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* @file
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* @author $Author$
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* @date Thu Mar 9 11:55:53 JST 1995
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* @copyright Copyright (C) 1993-2007 Yukihiro Matsumoto
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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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#include "ruby/3/config.h"
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#include "ruby/3/dllexport.h"
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#include "ruby/defines.h"
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#ifndef _
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#ifdef __cplusplus
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# ifndef HAVE_PROTOTYPES
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# define HAVE_PROTOTYPES 1
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# endif
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# ifndef HAVE_STDARG_PROTOTYPES
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# define HAVE_STDARG_PROTOTYPES 1
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# endif
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#endif
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#ifdef HAVE_PROTOTYPES
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# define _(args) args
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#else
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# define _(args) ()
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#endif
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#ifdef HAVE_STDARG_PROTOTYPES
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# define __(args) args
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#else
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# define __(args) ()
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#endif
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#endif
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RUBY3_SYMBOL_EXPORT_BEGIN()
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#define DECIMAL_SIZE_OF_BITS(n) (((n) * 3010 + 9998) / 9999)
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/* an approximation of ceil(n * log10(2)), up to 65536 at least */
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#define scan_oct(s,l,e) ((int)ruby_scan_oct((s),(l),(e)))
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unsigned long ruby_scan_oct(const char *, size_t, size_t *);
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#define scan_hex(s,l,e) ((int)ruby_scan_hex((s),(l),(e)))
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unsigned long ruby_scan_hex(const char *, size_t, size_t *);
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#ifdef HAVE_GNU_QSORT_R
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# define ruby_qsort qsort_r
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#else
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void ruby_qsort(void *, const size_t, const size_t,
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int (*)(const void *, const void *, void *), void *);
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#endif
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void ruby_setenv(const char *, const char *);
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void ruby_unsetenv(const char *);
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char *ruby_strdup(const char *);
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#undef strdup
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#define strdup(s) ruby_strdup(s)
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char *ruby_getcwd(void);
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double ruby_strtod(const char *, char **);
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#undef strtod
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#define strtod(s,e) ruby_strtod((s),(e))
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void ruby_each_words(const char *, void (*)(const char*, int, void*), void *);
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RUBY3_SYMBOL_EXPORT_END()
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#endif /* RUBY_UTIL_H */
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