Autosar Guidelines C++14, example code compile list(143)Rule A16-0-1 The pre-processor shall only be used

Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(143)
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。


#A16-0-1.cpp
##算譜(source code)

```c++:A16-0-1.cpp
//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A16-0-1 (required, implementation, automated) The pre-processor shall only be used for unconditional and conditional file inclusion and include guards, and using the following directives: (1) #ifndef, (2) #ifdef, (3) #if, (4) #if defined, (5) #elif, (6) #else, (7) #define, (8) #endif, (9) #include.(143)A16-0-1.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: A16-0-1.cpp 271687 2017-03-23 08:57:35Z piotr.tanski $
#pragma once // Non-compliant - implementation-defined feature

#ifndef HEADER_FILE_NAME // Compliant - include guard
#define HEADER_FILE_NAME // Compliant - include guard

#include <cstdint> // Compliant - unconditional file inclusion

#ifdef WIN32
#include <windows.h> // Compliant - conditional file inclusion
#endif

#ifdef WIN32
std::int32_t fn1(
  std::int16_t x,
  std::int16_t y) noexcept; // Non-compliant - not a file inclusion
#endif

#if defined VERSION && VERSION > 2011L // Compliant
#include <array> // Compliant - conditional file inclusion
#elif VERSION > 1998L // Compliant
#include <vector> // Compliant - conditional file inclusion
#endif // Compliant

#define MAX_ARRAY_SIZE 1024U // Non-compliant
#ifndef MAX_ARRAY_SIZE // Non-compliant
#error "MAX_ARRAY_SIZE has not been defined" // Non-compliant
#endif // Non-compliant
#undef MAX_ARRAY_SIZE // Non-compliant

#define MIN(a, b) (((a) < (b)) ? (a) : (b)) // Non-compliant
#define PLUS2(X) ((X) + 2) // Non-compliant - function should be used instead
#define PI 3.14159F // Non-compliant - constexpr should be used instead
#define std ::int32_t long // Non-compliant - ’using’ should be used instead
#define STARTIF if( // Non-compliant - language redefinition
#define HEADER "filename.h" // Non-compliant - string literal

void fn2() noexcept
{
#ifdef __linux__ // Non-compliant - ifdef not used for file inclusion

// ...

#elif WIN32 // Non-compliant - elif not used for file inclusion

// ...

#elif __APPLE__ // Non-compliant - elif not used for file inclusion

// ...

#else // Non-compliant - else not used for file inclusion

// ...

#endif // Non-compliant - endif not used for file inclusion or include guards
}
#endif // Compliant - include guard
/// @ end AUTOSAR
int start() { /// @{} for start
#ifdef WIN32
  fn1();
#endif
  fn2();
  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 a16-0-1
$ clang++ a16-0-1.cpp -I./ -std=c++14 -Wall
a16-0-1.cpp:14:9: warning: #pragma once in main file [-Wpragma-once-outside-header]
#pragma once // Non-compliant - implementation-defined feature
        ^
1 warning generated.
Rule A16-0-1 (required, implementation, automated) The pre-processor shall only be used for unconditional and conditional file inclusion and include guards, and using the following directives: (1) #ifndef, (2) #ifdef, (3) #if, (4) #if defined, (5) #elif, (6) #else, (7) #define, (8) #endif, (9) #include.(143)A16-0-1.cpp
$ clang++ a16-0-1.cpp  -I./ -std=c++17 -Wall
a16-0-1.cpp:14:9: warning: #pragma once in main file [-Wpragma-once-outside-header]
#pragma once // Non-compliant - implementation-defined feature
        ^
1 warning generated.
Rule A16-0-1 (required, implementation, automated) The pre-processor shall only be used for unconditional and conditional file inclusion and include guards, and using the following directives: (1) #ifndef, (2) #ifdef, (3) #if, (4) #if defined, (5) #elif, (6) #else, (7) #define, (8) #endif, (9) #include.(143)A16-0-1.cpp
$ clang++ a16-0-1.cpp  -I./ -std=c++2a -Wall
a16-0-1.cpp:14:9: warning: #pragma once in main file [-Wpragma-once-outside-header]
#pragma once // Non-compliant - implementation-defined feature
        ^
1 warning generated.
Rule A16-0-1 (required, implementation, automated) The pre-processor shall only be used for unconditional and conditional file inclusion and include guards, and using the following directives: (1) #ifndef, (2) #ifdef, (3) #if, (4) #if defined, (5) #elif, (6) #else, (7) #define, (8) #endif, (9) #include.(143)A16-0-1.cpp

$ g++-8 a16-0-1.cpp  -I./ -std=c++14  -Wall
a16-0-1.cpp:14:9: warning: #pragma once in main file
 #pragma once // Non-compliant - implementation-defined feature
         ^~~~
Rule A16-0-1 (required, implementation, automated) The pre-processor shall only be used for unconditional and conditional file inclusion and include guards, and using the following directives: (1) #ifndef, (2) #ifdef, (3) #if, (4) #if defined, (5) #elif, (6) #else, (7) #define, (8) #endif, (9) #include.(143)A16-0-1.cpp
$ g++-8 a16-0-1.cpp  -I./ -std=c++17  -Wall
a16-0-1.cpp:14:9: warning: #pragma once in main file
 #pragma once // Non-compliant - implementation-defined feature
         ^~~~
Rule A16-0-1 (required, implementation, automated) The pre-processor shall only be used for unconditional and conditional file inclusion and include guards, and using the following directives: (1) #ifndef, (2) #ifdef, (3) #if, (4) #if defined, (5) #elif, (6) #else, (7) #define, (8) #endif, (9) #include.(143)A16-0-1.cpp
$ g++-8 a16-0-1.cpp  -I./ -std=c++2a  -Wall
a16-0-1.cpp:14:9: warning: #pragma once in main file
 #pragma once // Non-compliant - implementation-defined feature
         ^~~~
Rule A16-0-1 (required, implementation, automated) The pre-processor shall only be used for unconditional and conditional file inclusion and include guards, and using the following directives: (1) #ifndef, (2) #ifdef, (3) #if, (4) #if defined, (5) #elif, (6) #else, (7) #define, (8) #endif, (9) #include.(143)A16-0-1.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