接続数

COUNTER379354FROM 2012/5/16

MISRA-C diary(C言語日誌)

MISRA-C >> Article details

2014/06/15

C++N3242, 2011 (68) 7.6.2 Alignment specifier(2files)

Tweet ThisSend to Facebook | by kaizen
// 1 filename:cpp2011-7-6-2.cpp
// ver 0.1 June.13, 2014
//
// 2 original examples and/or notes:
// (c) ISO/IEC JTC1 SC22 WG21 N3242, April 12, 2011
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3242.pdf
// > 7 Declarations 7.6 Attributes 7.6.2 Alignment specifier
//
// 3 compile and output mechanism:
// (c) Dr. OGAWA Kiyoshi, kaizen at gifu-u.ac.jp,
//
// 4 compile errors and/or warnings:
// 4.1(c) Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
// Target: x86_64-apple-darwin13.2.0,  Thread model: posix
// Command/Options: c++ -std=c++11 -stdlib=libc++ -Wall cpp2011-7-6-2.cpp cpp2011-7-6-2-tu2.cpp  
// (c) LLVM 2003-2009 University of Illinois at Urbana-Champaign.

// 4.2. g++-4.9 (GCC) 4.9.0 20131229 (experimental)
// Copyright (C) 2013 Free Software Foundation, Inc.
// This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// http://gcc.gnu.org/onlinedocs/gcc/Standards.html
// Command/Options: g++-4.9  -std=c++11  -Wall cpp2011-7-6-2.cpp cpp2011-7-6-2-tu2.cpp  
// g++-4.9: error: unrecognized command line option '-stdlib=libc++'
// Configuration:brew install gcc49
//
// 4.3. Visual Studio Express 2013, 
// (c) Microsoft http://www.visualstudio.com/
// SPEC:
// Windows 7, .NET Framework
// (c) VMware, Inc.
// VMWare fusion 6
//
// 5. Hardware:  MacBook Pro, 
//(c) Intel http://ark.intel.com/products/37006/
//Core 2 Duo 2.53GHz, 8GB, 1067MHz DDR3
//
// 6. Special Thanks: Upper organizatios and 
// ITSCJ/IPSJ http://www.itscj.ipsj.or.jp/itscj_english/index.html
// Renesas Electronics Corporation.http://www.renesas.com/
// NPO SESSAME project, http://www.sessame.jp/workinggroup/WorkingGroup3/
// Toyo Corporation, http://www.toyo.co.jp/English/
// Japan Standard Association, http://bit.ly/1lzykg1
// NPO TOPPERS project, https://www.toppers.jp/asp-d-download.html
// Daido Universcity, http://www.daido-it.ac.jp/gakubugakka/computer/index.html
// WITZ Co.Ltd., http://www.witz-inc.co.jp/products/solution/solution.html
// SevenWise.co., http://www.7ws.co.jp/index.html
// TOYOTA Motor Corporation, http://toyota.jp/
// IT planning Inc., http://www.itpl.co.jp/en/index.html
// DENSO Corporation, http://www.globaldenso.com/en/
// Aisin Seiki co. Ltd., http://www.aisin.com/
// Spancion Inc., http://www.spansion.com/
// Yazaki Corporation, http://www.yazaki-group.com/global/
// Pananosic Corporation, http://www.panasonic.net/
// SWEST: Summer Workshop on Embedded System Technologies , http://swest.toppers.jp
// CEST: Consortium for Embedded System Technology, http://www.ertl.jp/CEST/
// JUSE: Union of Japanese Scientists and Engineers, http://www.juse.or.jp/e/
// OSC:Open Source Conference, http://www.ospn.jp/

#include <iostream>
//#include <cstdlib>
//#include <string.h>
//#include <cstring>
//#include <type_traits>
//#include <cassert>
//#include <algorithm>
//#include <cmath>
//#include <complex>

using namespace std;

// Translation unit #2:
struct alignas(16) S; // error: definition of S lacks alignment; no
extern S* p; // diagnostic required
//
alignas(T) alignas(A) T buffer[N];
//
//error: alignas(double) void f(); // error: alignment applied to function
alignas(double) unsigned char c[sizeof(double)]; // array of characters, suitably aligned for a double
extern unsigned char c[sizeof(double)]; // no alignas necessary
//error: alignas(float) extern unsigned char c[sizeof(double)]; // error: different alignment in declaration

int main() {
//
cout << p << std::endl;
cout << "7 Declarations 7.6 Attributes 7.6.2 Alignment specifier" << std::endl;
return 0;
}
// 1 error
// 1.1 llvm: c++ -std=c++11 -stdlib=libc++ -Wall cpp2011-7-6-2.cpp cpp2011-7-6-2-tu2.cpp
cpp2011-7-6-2.cpp:75:9: error: use of undeclared identifier 'T'
alignas(T) alignas(A) T buffer[N];
        ^
cpp2011-7-6-2.cpp:75:20: error: use of undeclared identifier 'A'
alignas(T) alignas(A) T buffer[N];
                   ^
cpp2011-7-6-2.cpp:75:23: error: unknown type name 'T'
alignas(T) alignas(A) T buffer[N];
                      ^
cpp2011-7-6-2.cpp:75:32: error: use of undeclared identifier 'N'
alignas(T) alignas(A) T buffer[N];
                               ^
4 errors generated.
cpp2011-7-6-2-tu2.cpp:2:24: error: no viable conversion from 'struct S *' to 'struct S'
struct S { int x; } s, p = &s;
                       ^   ~~
cpp2011-7-6-2-tu2.cpp:2:8: note: candidate constructor (the implicit copy constructor) not viable: no known conversion from 'struct S *' to 'const S &' for
      1st argument; remove &
struct S { int x; } s, p = &s;
       ^                   ~~
cpp2011-7-6-2-tu2.cpp:2:8: note: candidate constructor (the implicit move constructor) not viable: no known conversion from 'struct S *' to 'S &&' for 1st
      argument
struct S { int x; } s, p = &s;
       ^                   ~~
> 1 error generated.
// gcc: g++-4.9 -std=c++11 -Wall cpp2011-7-6-2.cpp cpp2011-7-6-2-tu2.cpp 
cpp2011-7-6-2.cpp:75:9: error: 'T' was not declared in this scope
 alignas(T) alignas(A) T buffer[N];
         ^
cpp2011-7-6-2.cpp:75:33: error: declaration does not declare anything [-fpermissive]
 alignas(T) alignas(A) T buffer[N];
                                 ^
cpp2011-7-6-2-tu2.cpp:2:29: error: conversion from 'S*' to non-scalar type 'S' requested
 struct S { int x; } s, p = &s;
                             ^
-------------------------------
// file cpp2011-7-6-2-tu2.cpp
// Translation unit #1:
struct S { int x; } s, p = &s;

16:56 | Impressed! | Voted(0) | Comment(0)