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
17 lines
684 B
C
17 lines
684 B
C
#ifndef INTERNAL_STATIC_ASSERT_H /*-*-C-*-vi:se ft=c:*/
|
|
#define INTERNAL_STATIC_ASSERT_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.
|
|
* @brief C11 shim for _Static_assert.
|
|
*/
|
|
#include "ruby/3/static_assert.h"
|
|
#ifndef STATIC_ASSERT
|
|
# define STATIC_ASSERT RUBY3_STATIC_ASSERT
|
|
#endif
|
|
|
|
#endif /* INTERNAL_STATIC_ASSERT_H */
|