From 4ff3f205408ff8bb413d69151105d301858136ba Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?= Date: Fri, 10 Apr 2020 14:11:40 +0900 Subject: 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 --- vm_callinfo.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'vm_callinfo.h') diff --git a/vm_callinfo.h b/vm_callinfo.h index b3de14dcab..8b575f11c6 100644 --- a/vm_callinfo.h +++ b/vm_callinfo.h @@ -1,3 +1,14 @@ +#ifndef RUBY_VM_CALLINFO_H /*-*-C-*-vi:se ft=c:*/ +#define RUBY_VM_CALLINFO_H +/** + * @file + * @author Ruby developers + * @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. + */ + #include "debug_counter.h" enum vm_call_flag_bits { @@ -426,3 +437,5 @@ vm_ccs_p(const struct rb_class_cc_entries *ccs) // gc.c void rb_vm_ccs_free(struct rb_class_cc_entries *ccs); + +#endif /* RUBY_VM_CALLINFO_H */ -- cgit v1.2.3