目的(purpose)

AutosarのC++ GuidelineをOS, 制御のプログラムで利用するにあたって、(1)hosted, freestandingのどちらを基本にすべきか。(2)C++2014,C++2017, C++202aのどれを用いると良いか, (3)どの処理系を併用すると良いかを検討するため、-std=c++14, -std=c++17, -std=c++2aの3種類で、複数のコンパイラでコンパイルすることにより、誤(error)、警告(warning)、関数・変数連携(link)、出力(output)、にどのような影響があるかを確認する。
#成果(outcome)
複数の処理系の特徴が明確になるとともに、各標準段階, hosted, freestandingの特徴と課題を明確にする。

A2-11-5.cpp

算譜(source code)

A2-11-5.cpp

//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg= "Rule A2-11-5 (advisory, implementation, automated)An identifier name of a non-member object or function with static storageduration should not be reused.(18)A2-11-5.cpp";
//https://www.autosar.org/fileadmin/user_upload/standards/adaptive/17-03/AUTOSAR_RS_CPP14Guidelines.pdf
// There is no description about Autosar declear hosted or freestanding.
// If the Autosar intended both depending on the cases, autosar.h can choose one.
// Compile with -DHOSTED work as  hosted environment, -DFREESTANDING work as freestanding.

/// Comment: This rule is for last section.

///start AUTOSAR: From here to the "///end AUTOSAR" is from AUTOSAR without code having /// comment in line.
//% $Id: A2-11-5.cpp 271927 2017-03-24 12:01:35Z piotr.tanski $
#include "autosar.h"/// @line add header file https://qiita.com/kaizen_nagoya/items/4bde8f21ab059b96cf2a
#include <cstdint>

using namespace std;/// @line add using

// f2.cpp
namespace n_s1
{
// static std::int32_t globalvariable = 0; // Non-compliant - identifier reused
  static std::int16_t modulevariable = 10; // Compliant - identifier not reused
}
namespace n_s2
{
  static std::int16_t modulevariable2 = 20;
}
// static void globalfunction(); // Non-compliant - identifier reused
static std::int16_t modulevariable2 = 15; // Non-compliant - identifier reused

///end AUTOSAR

int start() { /// @{} for start
  cout  << "n_s1::modulevariable="<<n_s1::modulevariable <<endl;
  cout << "modulevariable2="<<modulevariable2<<"n_s2::modulevariable2="<<n_s2::modulevariable2 <<endl;
  globalfunction();
  cout<< msg << endl;
  ShutdownOS()  EXIT_SUCCESS;
/// Autosar OS 3.1.1, 2009: 7.1.2.2 Undefined Behaviour in OSEK OS
/// OS425 If ShutdownOS is called and ShutdownHook() returns then the operating system shall disable all interrupts and enter an endless loop.
}

a2-11-5a

#include "autosar.h"/// @line add header file https://qiita.com/kaizen_nagoya/items/4bde8f21ab059b96cf2a

using namespace std;

// f1.cpp
namespace n_s1
{
  static std::int32_t globalvariable = 50;
}
static std::int32_t filevariable = 5; // Compliant - identifier not reused
void globalfunction() { /// @ delete static
  cout <<"filevariable="<< filevariable<<"n_s1::globalvariable="<<n_s1::globalvariable<<endl;   /// @ {} add output
}

編纂・実行結果(compile and go)

cpa.sh

$ ../cpa2.sh a2-11-5 a2-11-5a
$ clang++ a2-11-5.cpp a2-11-5a.cpp  -std=c++14 -Wall
n_s1::modulevariable=10
modulevariable2=15n_s2::modulevariable2=20
filevariable=5n_s1::globalvariable=50
Rule A2-11-5 (advisory, implementation, automated)An identifier name of a non-member object or function with static storageduration should not be reused.(18)A2-11-5.cpp
rm: a2-11-5l13: No such file or directory
$ clang++ a2-11-5.cpp  a2-11-5a.cpp  -std=c++17 -Wall
n_s1::modulevariable=10
modulevariable2=15n_s2::modulevariable2=20
filevariable=5n_s1::globalvariable=50
Rule A2-11-5 (advisory, implementation, automated)An identifier name of a non-member object or function with static storageduration should not be reused.(18)A2-11-5.cpp
$ clang++ a2-11-5.cpp  a2-11-5a.cpp  -std=c++2a -Wall
n_s1::modulevariable=10
modulevariable2=15n_s2::modulevariable2=20
filevariable=5n_s1::globalvariable=50
Rule A2-11-5 (advisory, implementation, automated)An identifier name of a non-member object or function with static storageduration should not be reused.(18)A2-11-5.cpp

$ g++-8 a2-11-5.cpp a2-11-5a.cpp  -std=c++14  -Wall
n_s1::modulevariable=10
modulevariable2=15n_s2::modulevariable2=20
filevariable=5n_s1::globalvariable=50
Rule A2-11-5 (advisory, implementation, automated)An identifier name of a non-member object or function with static storageduration should not be reused.(18)A2-11-5.cpp
$ g++-8 a2-11-5.cpp a2-11-5a.cppp -std=c++17  -Wall
n_s1::modulevariable=10
modulevariable2=15n_s2::modulevariable2=20
filevariable=5n_s1::globalvariable=50
Rule A2-11-5 (advisory, implementation, automated)An identifier name of a non-member object or function with static storageduration should not be reused.(18)A2-11-5.cpp
$ g++-8 a2-11-5.cpp a2-11-5a.cppp -std=c++2a  -Wall
n_s1::modulevariable=10
modulevariable2=15n_s2::modulevariable2=20
filevariable=5n_s1::globalvariable=50
Rule A2-11-5 (advisory, implementation, automated)An identifier name of a non-member object or function with static storageduration should not be reused.(18)A2-11-5.cpp

検討事項(agenda)

###1. 自律(freestanding)環境. 接待(hosted)環境

C++N4606 1.4 Implementation compliance p.4

###2. 対応OSの水準、対応通信規約、応用機能による分類
freestanding用の関数、ライブラリ等
###3. C++2014, C++2017, C++202aの比較項目
本件なし
###4. clang++, g++の比較検討項目
本件なし

5 static, extern

externをつけるとstaticは使えない。staticをつけるとexternは使えない。そのため、コンパイルするためには原文に何らかの手入れが必要。

参考文献(reference)

C++N4741 2018 Working Draft, Standard for Programming Language C++
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/n4741.pdf

C++N4741, 2018 Standard Working Draft on ISO/IEC 14882 sample code compile list
https://qiita.com/kaizen_nagoya/items/3294c014044550896010

N4606 2016 Working Draft, Standard for Programming Language C++
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/n4606.pdf

C++N4606, 2016符号断片編纂一覧(example code compile list)
Working Draft 2016, ISO/IEC 14882(1)
https://qiita.com/kaizen_nagoya/items/df5d62c35bd6ed1c3d43/

文書履歴

ver 0.10 初稿 20180607
ver 0.11 一覧追記 20180613

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