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。

A2-11-3.cpp

算譜(source code)

A2-11-3.cpp

//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg= "Rule A2-11-3 (required, implementation, automated) A “user-defined” type name shall be a unique identifier within a namespace.(16)A2-11-3.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: A2-11-3.cpp 272338 2017-03-28 08:15:01Z piotr.tanski $
#include "autosar.h"/// @line add header file https://qiita.com/kaizen_nagoya/items/4bde8f21ab059b96cf2a
#include <cstdint>

using namespace std;/// @line add using

class Type
{
};
// struct Type { }; // Non-compliant, Type name reused
// enum class Type : std::int8_t { }; // Non-compliant, Type name reused

///end AUTOSAR
int start() { /// @{} for start
  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.
}

##編纂・実行結果(compile and go)

cpa.sh

$ ../cpa.sh a2-11-3
$ clang++ a2-11-3.cpp -std=c++14 -Wall
Rule A2-11-3 (required, implementation, automated) A “user-defined” type name shall be a unique identifier within a namespace.(16)A2-11-3.cpp
rm: a2-11-3l13: No such file or directory
$ clang++ a2-11-3.cpp -std=c++17 -Wall
Rule A2-11-3 (required, implementation, automated) A “user-defined” type name shall be a unique identifier within a namespace.(16)A2-11-3.cpp
$ clang++ a2-11-3.cpp -std=c++2a -Wall
Rule A2-11-3 (required, implementation, automated) A “user-defined” type name shall be a unique identifier within a namespace.(16)A2-11-3.cpp

$ g++-8 a2-11-3.cpp -std=c++14  -Wall
Rule A2-11-3 (required, implementation, automated) A “user-defined” type name shall be a unique identifier within a namespace.(16)A2-11-3.cpp
$ g++-8 a2-11-3.cpp -std=c++17  -Wall
Rule A2-11-3 (required, implementation, automated) A “user-defined” type name shall be a unique identifier within a namespace.(16)A2-11-3.cpp
$ g++-8 a2-11-3.cpp -std=c++2a  -Wall
Rule A2-11-3 (required, implementation, automated) A “user-defined” type name shall be a unique identifier within a namespace.(16)A2-11-3.cpp