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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
41 lines
1.5 KiB
C
41 lines
1.5 KiB
C
#ifndef INTERNAL_SYMBOL_H /*-*-C-*-vi:se ft=c:*/
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#define INTERNAL_SYMBOL_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 Symbol.
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*/
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#include "ruby/ruby.h" /* for VALUE */
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#include "ruby/encoding.h" /* for rb_encoding */
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#include "internal/compilers.h" /* for __has_builtin */
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#ifdef rb_sym_intern_ascii_cstr
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# undef rb_sym_intern_ascii_cstr
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#endif
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/* symbol.c */
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VALUE rb_to_symbol_type(VALUE obj);
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VALUE rb_sym_intern(const char *ptr, long len, rb_encoding *enc);
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VALUE rb_sym_intern_ascii(const char *ptr, long len);
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VALUE rb_sym_intern_ascii_cstr(const char *ptr);
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int rb_is_const_name(VALUE name);
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int rb_is_class_name(VALUE name);
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int rb_is_instance_name(VALUE name);
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int rb_is_local_name(VALUE name);
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PUREFUNC(int rb_is_const_sym(VALUE sym));
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PUREFUNC(int rb_is_attrset_sym(VALUE sym));
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ID rb_make_internal_id(void);
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void rb_gc_free_dsymbol(VALUE);
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#if __has_builtin(__builtin_constant_p)
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#define rb_sym_intern_ascii_cstr(ptr) \
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(__builtin_constant_p(ptr) ? \
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rb_sym_intern_ascii((ptr), (long)strlen(ptr)) : \
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rb_sym_intern_ascii_cstr(ptr))
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#endif
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#endif /* INTERNAL_SYMBOL_H */
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