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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
39 lines
1.4 KiB
C
39 lines
1.4 KiB
C
#ifndef INTERNAL_FILE_H /*-*-C-*-vi:se ft=c:*/
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#define INTERNAL_FILE_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 File.
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*/
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#include "ruby/ruby.h" /* for VALUE */
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#include "ruby/encoding.h" /* for rb_encodinng */
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/* file.c */
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extern const char ruby_null_device[];
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VALUE rb_home_dir_of(VALUE user, VALUE result);
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VALUE rb_default_home_dir(VALUE result);
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VALUE rb_realpath_internal(VALUE basedir, VALUE path, int strict);
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VALUE rb_check_realpath(VALUE basedir, VALUE path, rb_encoding *origenc);
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void rb_file_const(const char*, VALUE);
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int rb_file_load_ok(const char *);
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VALUE rb_file_expand_path_fast(VALUE, VALUE);
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VALUE rb_file_expand_path_internal(VALUE, VALUE, int, int, VALUE);
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VALUE rb_get_path_check_to_string(VALUE);
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VALUE rb_get_path_check_convert(VALUE);
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int ruby_is_fd_loadable(int fd);
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RUBY_SYMBOL_EXPORT_BEGIN
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/* file.c (export) */
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#ifdef HAVE_READLINK
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VALUE rb_readlink(VALUE path, rb_encoding *enc);
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#endif
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#ifdef __APPLE__
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VALUE rb_str_normalize_ospath(const char *ptr, long len);
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#endif
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RUBY_SYMBOL_EXPORT_END
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#endif /* INTERNAL_FILE_H */
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