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ruby--ruby/include/ruby/backward/st.h

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add #include guard hack 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
2020-04-10 14:11:40 +09:00
#ifndef RUBY_BACKWARD_ST_H /*-*-C++-*-vi:se ft=cpp:*/
#define RUBY_BACKWARD_ST_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.
*/
* lib/mkmf.rb (init_mkmf): add include/ruby/backward to $INCFLAGS. * include/ruby/backward/{st,util}.h: added for backward compatibility. [ruby-dev:35811] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@18673 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2008-08-17 06:58:10 +00:00
#if defined __GNUC__
#warning use "ruby/st.h" instead of bare "st.h"
* numeric.c: Good-by Borland-C. * include/ruby/backward/rubyio.h: ditto. * include/ruby/backward/st.h: ditto. * include/ruby/backward/util.h: ditto. * include/ruby/backward/rubysig.h: ditto. * include/ruby/backward/classext.h: ditto. * dln.c: ditto. * gc.c: ditto. * win32/resource.rb: ditto. * win32/dir.h: ditto. * ext/tk/tcltklib.c: ditto. * NEWS: announce that Borland-C is no longer supported. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52168 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2015-10-18 02:10:34 +00:00
#elif defined _MSC_VER
* lib/mkmf.rb (init_mkmf): add include/ruby/backward to $INCFLAGS. * include/ruby/backward/{st,util}.h: added for backward compatibility. [ruby-dev:35811] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@18673 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2008-08-17 06:58:10 +00:00
#pragma message("warning: use \"ruby/st.h\" instead of bare \"st.h\"")
#endif
#include "ruby/st.h"
add #include guard hack 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
2020-04-10 14:11:40 +09:00
#endif /* RUBY_BACKWARD_ST_H */
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