mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
4ff3f20540
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
18 lines
721 B
C++
18 lines
721 B
C++
#ifndef RUBY_BACKWARD_RUBYIO_H /*-*-C++-*-vi:se ft=cpp:*/
|
|
#define RUBY_BACKWARD_RUBYIO_H
|
|
/**
|
|
* @file
|
|
* @author Ruby developers <ruby-core@ruby-lang.org>
|
|
* @copyright This file is a part of the programming language Ruby.
|
|
* Permission is hereby granted, to either redistribute and/or
|
|
* modify this file, provided that the conditions mentioned in the
|
|
* file COPYING are met. Consult the file for details.
|
|
*/
|
|
#if defined __GNUC__
|
|
#warning use "ruby/io.h" instead of "rubyio.h"
|
|
#elif defined _MSC_VER
|
|
#pragma message("warning: use \"ruby/io.h\" instead of \"rubyio.h\"")
|
|
#endif
|
|
#include "ruby/io.h"
|
|
|
|
#endif /* RUBY_BACKWARD_RUBYIO_H */
|