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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
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
#ifndef RUBY_VM_OPTS_H/*-*-c-*-*/
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#define RUBY_VM_OPTS_H
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/**********************************************************************
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vm_opts.h - VM optimize option
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$Author$
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Copyright (C) 2004-2007 Koichi Sasada
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**********************************************************************/
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/* Compile options.
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* You can change these options at runtime by VM::CompileOption.
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* Following definitions are default values.
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*/
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#define OPT_TAILCALL_OPTIMIZATION 0
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#define OPT_PEEPHOLE_OPTIMIZATION 1
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#define OPT_SPECIALISED_INSTRUCTION 1
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#define OPT_INLINE_CONST_CACHE 1
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#define OPT_FROZEN_STRING_LITERAL 0
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#define OPT_DEBUG_FROZEN_STRING_LITERAL 0
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/* Build Options.
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* You can't change these options at runtime.
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*/
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/* C compiler dependent */
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/*
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* 0: direct (using labeled goto using GCC special)
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* 1: token (switch/case)
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* 2: call (function call for each insn dispatch)
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*/
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#ifndef OPT_THREADED_CODE
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#define OPT_THREADED_CODE 0
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#endif
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#define OPT_DIRECT_THREADED_CODE (OPT_THREADED_CODE == 0)
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#define OPT_TOKEN_THREADED_CODE (OPT_THREADED_CODE == 1)
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#define OPT_CALL_THREADED_CODE (OPT_THREADED_CODE == 2)
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/* VM running option */
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#define OPT_CHECKED_RUN 1
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#define OPT_INLINE_METHOD_CACHE 1
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#define OPT_GLOBAL_METHOD_CACHE 1
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#define OPT_BLOCKINLINING 0
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#ifndef OPT_IC_FOR_IVAR
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#define OPT_IC_FOR_IVAR 1
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#endif
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/* architecture independent, affects generated code */
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#define OPT_OPERANDS_UNIFICATION 1
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#define OPT_INSTRUCTIONS_UNIFICATION 0
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#define OPT_UNIFY_ALL_COMBINATION 0
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#define OPT_STACK_CACHING 0
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/* misc */
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#ifndef OPT_SUPPORT_JOKE
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#define OPT_SUPPORT_JOKE 0
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#endif
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#ifndef VM_COLLECT_USAGE_DETAILS
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#define VM_COLLECT_USAGE_DETAILS 0
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#endif
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#endif /* RUBY_VM_OPTS_H */
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