Autosar Guidelines C++14, example code compile list(150)Rule A17-1-1 Use of the C Standard Library

Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(150)
https://www.autosar.org/fileadmin/user_upload/standards/adaptive/17-03/AUTOSAR_RS_CPP14Guidelines.pdf
Autosar Guidelines C++14, example code compile list will be listed.
#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、以下を検討する。
(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。
-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。
各標準段階の違いを明確にする。
hostedまたはfreestandingの特徴と課題を明確にする。


#A17-1-1.cpp
##算譜(source code)

```c++:A17-1-1.cpp
//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A17-1-1 (required, implementation, non-automated) Use of the C Standard Library shall be encapsulated and isolated.(150)A17-1-1.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.

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

using namespace std;/// @line add using

/// @ start AUTOSAR: From here to the "///end AUTOSAR" are from the AUTOSAR code without some code having /// comment in line.
// $Id: A17-1-1.cpp 271687 2017-03-23 08:57:35Z piotr.tanski $
#include <cerrno>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <stdexcept>

void fn1(const char* filename) // Compliant - C code is isolated; fn1()
// function is a wrapper.
{
  FILE* handle = fopen(filename, "rb");
  if (handle == NULL)
  {
    throw std::system_error(errno, std::system_category());
  }
// ...
  fclose(handle);
}

void fn2() noexcept
{
  try
  {
    fn1("filename.txt"); // Compliant - fn1() allows you to use C code like
// C++ code

// ...
  }
  catch (std::system_error& e)
  {
    std::cerr << "Error: " << e.code() << " - " << e.what() << '\n';
  }
}

std::int32_t fn3(const char* filename) noexcept // Non-compliant - placing C
// functions calls along with C++
// code forces a developer to be
// responsible for C-specific error
// handling, explicit resource
// cleanup, etc.
{
  FILE* handle = fopen(filename, "rb");
  if (handle == NULL)
  {
    std::cerr << "An error occured: " << errno << " - " << strerror(errno)
              << '\n';
    return errno;
  }

  try
  {
// ...
    fclose(handle);
  }
  catch (std::system_error& e)
  {
    fclose(handle);
  }
  catch (std::exception& e)
  {
    fclose(handle);
  }

  return errno;
}
/// @ end AUTOSAR
int start() { /// @{} for start
  const char * f ="filename.txt";
  fn2();
  fn3(f);
  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)

```shell-session:cpa.sh
$ ../cpa.sh a17-1-1
$ clang++ a17-1-1.cpp -I./ -std=c++14 -Wall
Rule A17-1-1 (required, implementation, non-automated) Use of the C Standard Library shall be encapsulated and isolated.(150)A17-1-1.cpp
$ clang++ a17-1-1.cpp  -I./ -std=c++17 -Wall
Rule A17-1-1 (required, implementation, non-automated) Use of the C Standard Library shall be encapsulated and isolated.(150)A17-1-1.cpp
$ clang++ a17-1-1.cpp  -I./ -std=c++2a -Wall
Rule A17-1-1 (required, implementation, non-automated) Use of the C Standard Library shall be encapsulated and isolated.(150)A17-1-1.cpp

$ g++-8 a17-1-1.cpp  -I./ -std=c++14  -Wall
Rule A17-1-1 (required, implementation, non-automated) Use of the C Standard Library shall be encapsulated and isolated.(150)A17-1-1.cpp
$ g++-8 a17-1-1.cpp  -I./ -std=c++17  -Wall
Rule A17-1-1 (required, implementation, non-automated) Use of the C Standard Library shall be encapsulated and isolated.(150)A17-1-1.cpp
$ g++-8 a17-1-1.cpp  -I./ -std=c++2a  -Wall
Rule A17-1-1 (required, implementation, non-automated) Use of the C Standard Library shall be encapsulated and isolated.(150)A17-1-1.cpp
```
### filename.txtがない場合

```shell-session:cpa.sh
$ ../cpa.sh a17-1-1
$ clang++ a17-1-1.cpp -I./ -std=c++14 -Wall
Error: system:2 - No such file or directory
An error occured: 2 - No such file or directory
Rule A17-1-1 (required, implementation, non-automated) Use of the C Standard Library shall be encapsulated and isolated.(150)A17-1-1.cpp
$ clang++ a17-1-1.cpp  -I./ -std=c++17 -Wall
Error: system:2 - No such file or directory
An error occured: 2 - No such file or directory
Rule A17-1-1 (required, implementation, non-automated) Use of the C Standard Library shall be encapsulated and isolated.(150)A17-1-1.cpp
$ clang++ a17-1-1.cpp  -I./ -std=c++2a -Wall
Error: system:2 - No such file or directory
An error occured: 2 - No such file or directory
Rule A17-1-1 (required, implementation, non-automated) Use of the C Standard Library shall be encapsulated and isolated.(150)A17-1-1.cpp

$ g++-8 a17-1-1.cpp  -I./ -std=c++14  -Wall
Error: system:2 - No such file or directory
An error occured: 2 - No such file or directory
Rule A17-1-1 (required, implementation, non-automated) Use of the C Standard Library shall be encapsulated and isolated.(150)A17-1-1.cpp
$ g++-8 a17-1-1.cpp  -I./ -std=c++17  -Wall
Error: system:2 - No such file or directory
An error occured: 2 - No such file or directory
Rule A17-1-1 (required, implementation, non-automated) Use of the C Standard Library shall be encapsulated and isolated.(150)A17-1-1.cpp
$ g++-8 a17-1-1.cpp  -I./ -std=c++2a  -Wall
Error: system:2 - No such file or directory
An error occured: 2 - No such file or directory
Rule A17-1-1 (required, implementation, non-automated) Use of the C Standard Library shall be encapsulated and isolated.(150)A17-1-1.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. 役立つまたは意味のある出力

#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

###C++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 20180612