17.5 Startup and termination [support.start.term] C++N4910:2022 (280) p512.cpp

# はじめに(Introduction)

N4910  Working Draft, Standard for Programming Language C++

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/n4910.pdf

n4910は、ISO/IEC JTC1 SC22 WG21の作業原案(Working Draft)です。
公式のISO/IEC 14882原本ではありません。
ISO/IEC JTC1 SC22 WG21では、可能な限り作業文書を公開し、幅広い意見を求めています。
一連の記事はコード断片をコンパイルできる形にする方法を検討してコンパイル、リンク、実行して、規格案の原文と処理系(g++, Clang++)との違いを確認し、技術内容を検討し、ISO/IEC JTC1 SC22 WG21にフィードバックするために用います。
また、CERT C++, MISRA C++等のコーディング標準のコード断片をコンパイルする際の参考にさせていただこうと考えています。CERT C++, MISRA C++が標準化の動きとの時間的なずれがあれば確認できれば幸いです。また、boostライブラリとの関連、Linux OS, TOPPERSカーネル、g++(GCC), clang++(LLVM）との関係も調査中です。
何か、抜け漏れ、耳より情報がありましたらおしらせくださると幸いです。

 <この項は書きかけです。順次追記します。>

## 背景(back ground)
C/C++でコンパイルエラーが出ると、途方にくれることがしばしばあります。
何回かに１回は、該当するエラーが検索できます。
ただ、条件が違っていて、そこでの修正方法では目的を達成しないこともしばしばです。いろいろな条件のコンパイルエラーとその対応方法について、広く記録することによって、いつか同じエラーに遭遇した時にやくに立つことを目指しています。

この半年の間で、三度、自分のネットでの記録に助けられたことがあります。
また過去に解決できなかった記録を１０種類以上、最近になって解決できたことがあります。それは、主に次の３つの情報に基づいています。

https://stackoverflow.com
https://cpprefjp.github.io
http://ja.cppreference.com/

また
https://researchmap.jp/joub9b3my-1797580/#_1797580
に記載したサイトのお世話になっています。

## 作業方針(sequence)
Clang++では-std=c++03, C++2bの2種類
g++では-std=c++03, c++2bの２種類
でコンパイルし、

１）コンパイルエラーを収集する。
２）コンパイルエラーをなくす方法を検討する。
コンパイルエラーになる例を示すだけが目的のコードは、コンパイルエラーをなくすのではなく、コンパイルエラーの種類を収集するだけにする。
文法を示すのが目的のコード場合に、コンパイルエラーをなくすのに手間がかかる場合は、順次作業します。
３）リンクエラーをなくす方法を検討する。
文法を示すのが目的のコード場合に、リンクエラーをなくすのに手間がかかる場合は、順次作業します。
４）意味のある出力を作る。
コンパイル、リンクが通っても、意味のある出力を示そうとすると、コンパイル・リンクエラーが出て収拾できそうにない場合がある。順次作業します。

１）だけのものから４）まで進んだものと色々ある状態です。一歩でも前に進むご助言をお待ちしています。「検討事項」の欄に現状を記録するようにしています。

### C++N4910:2022 Standard Working Draft on ISO/IEC 14882(0) sample code compile list  

https://qiita.com/kaizen_nagoya/items/fc957ddddd402004bb91

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

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

### C++N3242, 2011 sample code compile list on clang++ and g++
https://qiita.com/kaizen_nagoya/items/685b5c1a2c17c1bf1318

## 編纂器(Compiler)
### clang++ --version
> Debian clang version 14.0.5-++20220610033153+c12386ae247c-1~exp1~20220610153237.151
Target: x86_64-pc-linux-gnu, Thread model: posix, InstalledDir: /usr/bin

### g++- --version
> g++ (GCC) 12.1.0  Copyright (C) 2022 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.

#  17.5 Startup and termination [support.start.term] C++N4910:2022 (280) p512.cpp

## 算譜(source code)

```c++:p512.cpp
// C++N4910 Committee Draft, Standard for Programming Language C++
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/n4910.pdf
const char * n4910 = " 17.5 Startup and termination [support.start.term] C++N4910:2022 (280) p512.cpp";
// Debian clang version 14.0.5-++20220610033153+c12386ae247c-
// g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc.
// Edited by Dr. OGAWA Kiyoshi. Compile procedure and results record.
// C++N4910:2022 Standard Working Draft on ISO/IEC 14882(0) sample code compile list
// https://qiita.com/kaizen_nagoya/items/fc957ddddd402004bb91

#include <iostream>
#include <cstdio>
#include <cstdlib> 
#include <cstring>
#include <cassert>
#include <coroutine>
#include <vector>
#include <complex>
#include <map>
#include <atomic>
#include <unordered_map>
#include <typeinfo>

using namespace std;

// Example 1  
[[noreturn]] void _Exit(int status) noexcept;
// Effects: This function has the semantics specified in the C standard library.
Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function _Exit is signal-safe (17.13.5).
     [[noreturn]] void abort() noexcept;
// Effects: This function has the semantics specified in the C standard library.
Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function abort is signal-safe (17.13.5).
int atexit(c-atexit-handler* f) noexcept; int atexit(atexit-handler* f) noexcept;
// Effects: The atexit() functions register the function pointed to by f to be called without arguments at normal program termination. It is unspecified whether a call to atexit() that does not happen before (6.9.2) a call to exit() will succeed. Implementation limits: The implementation shall support the registration of at least 32 functions. Returns: The atexit() function returns zero if the registration succeeds, nonzero if it fails.
[[noreturn]] void exit(int status);
// Effects: — First, objects with thread storage duration and associated with the current thread are destroyed. Next, objects with static storage duration are destroyed and functions registered by calling atexit are called.201 See 6.9.3.4 for the order of destructions and calls. (Objects with automatic storage duration are not destroyed as a result of calling exit().)202
If a registered function invoked by exit exits via an exception, the function std::terminate is invoked (14.6.2).
// — Next, all open C streams (as mediated by the function signatures declared in <cstdio> (31.13.1)) with unwritten buffered data are flushed, all open C streams are closed, and all files created by calling tmpfile() are removed.
// — Finally, control is returned to the host environment. If status is zero or EXIT_SUCCESS, an implementation-defined form of the status successful termination is returned. If status is EXIT_- FAILURE, an implementation-defined form of the status unsuccessful termination is returned. Otherwise the status returned is implementation-defined.2
int at_quick_exit(c-atexit-handler* f) noexcept; int at_quick_exit(atexit-handler* f) noexcept;
// Effects: The at_quick_exit() functions register the function pointed to by f to be called without arguments when quick_exit is called. It is unspecified whether a call to at_quick_exit() that does not happen before (6.9.2) all calls to quick_exit will succeed.
[[noreturn]] void quick_exit(int status) noexcept;
// Effects: Functions registered by calls to at_quick_exit are called in the reverse order of their registration, except that a function shall be called after any previously registered functions that had already been called at the time it was registered. Objects shall not be destroyed as a result of calling quick_exit. If a registered function invoked by quick_exit exits via an exception, the function std::terminate is invoked (14.6.2).
int main(){
  cout  <<  n4910 << endl;
  return EXIT_SUCCESS;
}
```

## Script

```bash:clgc.sh
#!/bin/sh
rm $1l
rm $1g
echo "$ clang++ $1.cpp -std=03 -o $1l -I. -Wall" 
clang++ $1.cpp -std=c++03 -o $1l -I. -Wall
if [  -e $1l ]; then
./$1l 
fi
rm $1l
echo "$ clang++ $1.cpp -std=2b -o $1l -I. -Wall"
clang++ $1.cpp -std=c++2b -o $1l -I. -Wall
if [  -e $1l ]; then
./$1l
fi
echo "\r"
echo "$ g++ $1.cpp -std=03 -o $1g -I. -Wall"
g++ $1.cpp -std=c++03 -o $1g -I. -Wall
if [ -e $1g ]; then
./$1g
fi
rm $1g
echo "\r"
echo "$ g++ $1.cpp -std=2b -o $1g -I. -Wall"
g++ $1.cpp -std=c++2b -o $1g -I. -Wall
if [ -e $1g ]; then
./$1g 
fi
```
## 編纂・実行結果(compile and go)

```ubuntu:bash
# ./clgc.sh p512
rm: cannot remove 'p512l': No such file or directory
rm: cannot remove 'p512g': No such file or directory
$ clang++ p512.cpp -std=c++03 -o p512l -I. -Wall
In file included from p512.cpp:19:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/atomic:38:
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/c++0x_warning.h:32:2: error: This file requires compiler and library support for the ISO C++ 2011 standard. This support must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
#error This file requires compiler and library support \
 ^
p512.cpp:26:2: error: expected expression
[[noreturn]] void _Exit(int status) noexcept;
 ^
p512.cpp:26:14: error: expected unqualified-id
[[noreturn]] void _Exit(int status) noexcept;
             ^
p512.cpp:28:1: error: unknown type name 'Remarks'
Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function _Exit is signal-safe (17.13.5).
^
p512.cpp:28:8: error: expected unqualified-id
Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function _Exit is signal-safe (17.13.5).
       ^
p512.cpp:31:1: error: unknown type name 'Remarks'
Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function abort is signal-safe (17.13.5).
^
p512.cpp:31:8: error: expected unqualified-id
Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function abort is signal-safe (17.13.5).
       ^
p512.cpp:32:47: error: redefinition of 'atexit' as different kind of symbol
int atexit(c-atexit-handler* f) noexcept; int atexit(atexit-handler* f) noexcept;
                                              ^
/usr/include/stdlib.h:595:12: note: previous definition is here
extern int atexit (void (*__func) (void)) __THROW __nonnull ((1));
           ^
p512.cpp:32:61: error: use of undeclared identifier 'handler'
int atexit(c-atexit-handler* f) noexcept; int atexit(atexit-handler* f) noexcept;
                                                            ^
p512.cpp:32:70: error: use of undeclared identifier 'f'
int atexit(c-atexit-handler* f) noexcept; int atexit(atexit-handler* f) noexcept;
                                                                     ^
p512.cpp:32:72: error: expected ';' after top level declarator
int atexit(c-atexit-handler* f) noexcept; int atexit(atexit-handler* f) noexcept;
                                                                       ^
                                                                       ;
p512.cpp:34:2: error: expected expression
[[noreturn]] void exit(int status);
 ^
p512.cpp:34:14: error: expected unqualified-id
[[noreturn]] void exit(int status);
             ^
p512.cpp:36:1: error: unknown type name 'If'
If a registered function invoked by exit exits via an exception, the function std::terminate is invoked (14.6.2).
^
p512.cpp:36:5: error: expected ';' after top level declarator
If a registered function invoked by exit exits via an exception, the function std::terminate is invoked (14.6.2).
    ^
    ;
p512.cpp:39:54: error: redefinition of 'at_quick_exit' as different kind of symbol
int at_quick_exit(c-atexit-handler* f) noexcept; int at_quick_exit(atexit-handler* f) noexcept;
                                                     ^
/usr/include/stdlib.h:600:18: note: previous definition is here
extern "C++" int at_quick_exit (void (*__func) (void))
                 ^
p512.cpp:39:75: error: use of undeclared identifier 'handler'
int at_quick_exit(c-atexit-handler* f) noexcept; int at_quick_exit(atexit-handler* f) noexcept;
                                                                          ^
p512.cpp:39:84: error: use of undeclared identifier 'f'
int at_quick_exit(c-atexit-handler* f) noexcept; int at_quick_exit(atexit-handler* f) noexcept;
                                                                                   ^
p512.cpp:39:86: error: expected ';' after top level declarator
int at_quick_exit(c-atexit-handler* f) noexcept; int at_quick_exit(atexit-handler* f) noexcept;
                                                                                     ^
                                                                                     ;
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
rm: cannot remove 'p512l': No such file or directory
$ clang++ p512.cpp -std=c++2b -o p512l -I. -Wall
p512.cpp:26:3: error: 'noreturn' attribute does not appear on the first declaration
[[noreturn]] void _Exit(int status) noexcept;
  ^
/usr/include/stdlib.h:629:13: note: previous declaration is here
extern void _Exit (int __status) __THROW __attribute__ ((__noreturn__));
            ^
p512.cpp:28:1: error: unknown type name 'Remarks'
Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function _Exit is signal-safe (17.13.5).
^
p512.cpp:28:8: error: expected unqualified-id
Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function _Exit is signal-safe (17.13.5).
       ^
p512.cpp:31:1: error: unknown type name 'Remarks'
Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function abort is signal-safe (17.13.5).
^
p512.cpp:31:8: error: expected unqualified-id
Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function abort is signal-safe (17.13.5).
       ^
p512.cpp:32:47: error: redefinition of 'atexit' as different kind of symbol
int atexit(c-atexit-handler* f) noexcept; int atexit(atexit-handler* f) noexcept;
                                              ^
/usr/include/stdlib.h:595:12: note: previous definition is here
extern int atexit (void (*__func) (void)) __THROW __nonnull ((1));
           ^
p512.cpp:32:61: error: use of undeclared identifier 'handler'
int atexit(c-atexit-handler* f) noexcept; int atexit(atexit-handler* f) noexcept;
                                                            ^
p512.cpp:32:70: error: use of undeclared identifier 'f'
int atexit(c-atexit-handler* f) noexcept; int atexit(atexit-handler* f) noexcept;
                                                                     ^
p512.cpp:32:72: error: expected ';' after top level declarator
int atexit(c-atexit-handler* f) noexcept; int atexit(atexit-handler* f) noexcept;
                                                                       ^
                                                                       ;
p512.cpp:34:3: error: 'noreturn' attribute does not appear on the first declaration
[[noreturn]] void exit(int status);
  ^
/usr/include/stdlib.h:617:13: note: previous declaration is here
extern void exit (int __status) __THROW __attribute__ ((__noreturn__));
            ^
p512.cpp:36:1: error: unknown type name 'If'
If a registered function invoked by exit exits via an exception, the function std::terminate is invoked (14.6.2).
^
p512.cpp:36:5: error: expected ';' after top level declarator
If a registered function invoked by exit exits via an exception, the function std::terminate is invoked (14.6.2).
    ^
    ;
p512.cpp:39:54: error: redefinition of 'at_quick_exit' as different kind of symbol
int at_quick_exit(c-atexit-handler* f) noexcept; int at_quick_exit(atexit-handler* f) noexcept;
                                                     ^
/usr/include/stdlib.h:600:18: note: previous definition is here
extern "C++" int at_quick_exit (void (*__func) (void))
                 ^
p512.cpp:39:75: error: use of undeclared identifier 'handler'
int at_quick_exit(c-atexit-handler* f) noexcept; int at_quick_exit(atexit-handler* f) noexcept;
                                                                          ^
p512.cpp:39:84: error: use of undeclared identifier 'f'
int at_quick_exit(c-atexit-handler* f) noexcept; int at_quick_exit(atexit-handler* f) noexcept;
                                                                                   ^
p512.cpp:39:86: error: expected ';' after top level declarator
int at_quick_exit(c-atexit-handler* f) noexcept; int at_quick_exit(atexit-handler* f) noexcept;
                                                                                     ^
                                                                                     ;
p512.cpp:41:3: error: 'noreturn' attribute does not appear on the first declaration
[[noreturn]] void quick_exit(int status) noexcept;
  ^
/usr/include/stdlib.h:623:13: note: previous declaration is here
extern void quick_exit (int __status) __THROW __attribute__ ((__noreturn__));
            ^
17 errors generated.

$ g++ p512.cpp -std=c++03 -o p512g -I. -Wall
In file included from /usr/local/include/c++/12.1.0/atomic:38,
                 from p512.cpp:19:
/usr/local/include/c++/12.1.0/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
   32 | #error This file requires compiler and library support \
      |  ^~~~~
p512.cpp:26:37: warning: identifier 'noexcept' is a keyword in C++11 [-Wc++11-compat]
   26 | [[noreturn]] void _Exit(int status) noexcept;
      |                                     ^~~~~~~~
p512.cpp:28:177: error: too many decimal points in number
   28 | tomatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function _Exit is signal-safe (17.13.5).
      |                                                                                               ^~~~~~~

p512.cpp:28:222: error: too many decimal points in number
   28 |  and without calling functions passed to atexit() (6.9.3.4). The function _Exit is signal-safe (17.13.5).
      |                                                                                                 ^~~~~~~

p512.cpp:31:177: error: too many decimal points in number
   31 | tomatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function abort is signal-safe (17.13.5).
      |                                                                                               ^~~~~~~

p512.cpp:31:222: error: too many decimal points in number
   31 |  and without calling functions passed to atexit() (6.9.3.4). The function abort is signal-safe (17.13.5).
      |                                                                                                 ^~~~~~~

p512.cpp:36:106: error: too many decimal points in number
   36 | istered function invoked by exit exits via an exception, the function std::terminate is invoked (14.6.2).
      |                                                                                                  ^~~~~~

p512.cpp:26:1: error: expected unqualified-id before '[' token
   26 | [[noreturn]] void _Exit(int status) noexcept;
      | ^
p512.cpp:28:8: error: found ':' in nested-name-specifier, expected '::'
   28 | Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function _Exit is signal-safe (17.13.5).
      |        ^
      |        ::
p512.cpp:28:1: error: 'Remarks' does not name a type
   28 | Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function _Exit is signal-safe (17.13.5).
      | ^~~~~~~
p512.cpp:31:8: error: found ':' in nested-name-specifier, expected '::'
   31 | Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function abort is signal-safe (17.13.5).
      |        ^
      |        ::
p512.cpp:31:1: error: 'Remarks' does not name a type
   31 | Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function abort is signal-safe (17.13.5).
      | ^~~~~~~
p512.cpp:32:54: error: 'int atexit' redeclared as different kind of entity
   32 | int atexit(c-atexit-handler* f) noexcept; int atexit(atexit-handler* f) noexcept;
      |                                                      ^~~~~~
In file included from /usr/local/include/c++/12.1.0/cstdlib:75,
                 from p512.cpp:12:
/usr/include/stdlib.h:595:12: note: previous declaration 'int atexit(void (*)())'
  595 | extern int atexit (void (*__func) (void)) __THROW __nonnull ((1));
      |            ^~~~~~
p512.cpp:32:61: error: 'handler' was not declared in this scope
   32 | int atexit(c-atexit-handler* f) noexcept; int atexit(atexit-handler* f) noexcept;
      |                                                             ^~~~~~~
p512.cpp:32:70: error: 'f' was not declared in this scope
   32 | int atexit(c-atexit-handler* f) noexcept; int atexit(atexit-handler* f) noexcept;
      |                                                                      ^
p512.cpp:34:1: error: expected unqualified-id before '[' token
   34 | [[noreturn]] void exit(int status);
      | ^
p512.cpp:36:1: error: 'If' does not name a type
   36 | If a registered function invoked by exit exits via an exception, the function std::terminate is invoked (14.6.2).
      | ^~
p512.cpp:39:68: error: 'int at_quick_exit' redeclared as different kind of entity
   39 | int at_quick_exit(c-atexit-handler* f) noexcept; int at_quick_exit(atexit-handler* f) noexcept;
      |                                                                    ^~~~~~
/usr/include/stdlib.h:600:18: note: previous declaration 'int at_quick_exit(void (*)())'
  600 | extern "C++" int at_quick_exit (void (*__func) (void))
      |                  ^~~~~~~~~~~~~
p512.cpp:39:75: error: 'handler' was not declared in this scope
   39 | int at_quick_exit(c-atexit-handler* f) noexcept; int at_quick_exit(atexit-handler* f) noexcept;
      |                                                                           ^~~~~~~
p512.cpp:39:84: error: 'f' was not declared in this scope
   39 | int at_quick_exit(c-atexit-handler* f) noexcept; int at_quick_exit(atexit-handler* f) noexcept;
      |                                                                                    ^
p512.cpp:41:1: error: expected unqualified-id before '[' token
   41 | [[noreturn]] void quick_exit(int status) noexcept;
      | ^
rm: cannot remove 'p512g': No such file or directory

$ g++ p512.cpp -std=c++2b -o p512g -I. -Wall
p512.cpp:28:177: error: too many decimal points in number
   28 | tomatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function _Exit is signal-safe (17.13.5).
      |                                                                                               ^~~~~~~

p512.cpp:28:222: error: too many decimal points in number
   28 |  and without calling functions passed to atexit() (6.9.3.4). The function _Exit is signal-safe (17.13.5).
      |                                                                                                 ^~~~~~~

p512.cpp:31:177: error: too many decimal points in number
   31 | tomatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function abort is signal-safe (17.13.5).
      |                                                                                               ^~~~~~~

p512.cpp:31:222: error: too many decimal points in number
   31 |  and without calling functions passed to atexit() (6.9.3.4). The function abort is signal-safe (17.13.5).
      |                                                                                                 ^~~~~~~

p512.cpp:36:106: error: too many decimal points in number
   36 | istered function invoked by exit exits via an exception, the function std::terminate is invoked (14.6.2).
      |                                                                                                  ^~~~~~

p512.cpp:28:8: error: found ':' in nested-name-specifier, expected '::'
   28 | Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function _Exit is signal-safe (17.13.5).
      |        ^
      |        ::
p512.cpp:28:1: error: 'Remarks' does not name a type
   28 | Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function _Exit is signal-safe (17.13.5).
      | ^~~~~~~
p512.cpp:31:8: error: found ':' in nested-name-specifier, expected '::'
   31 | Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function abort is signal-safe (17.13.5).
      |        ^
      |        ::
p512.cpp:31:1: error: 'Remarks' does not name a type
   31 | Remarks: The program is terminated without executing destructors for objects of automatic, thread, or static storage duration and without calling functions passed to atexit() (6.9.3.4). The function abort is signal-safe (17.13.5).
      | ^~~~~~~
p512.cpp:32:54: error: 'int atexit' redeclared as different kind of entity
   32 | int atexit(c-atexit-handler* f) noexcept; int atexit(atexit-handler* f) noexcept;
      |                                                      ^~~~~~
In file included from /usr/local/include/c++/12.1.0/cstdlib:75,
                 from /usr/local/include/c++/12.1.0/ext/string_conversions.h:41,
                 from /usr/local/include/c++/12.1.0/bits/basic_string.h:3960,
                 from /usr/local/include/c++/12.1.0/string:53,
                 from /usr/local/include/c++/12.1.0/bits/locale_classes.h:40,
                 from /usr/local/include/c++/12.1.0/bits/ios_base.h:41,
                 from /usr/local/include/c++/12.1.0/ios:42,
                 from /usr/local/include/c++/12.1.0/ostream:38,
                 from /usr/local/include/c++/12.1.0/iostream:39,
                 from p512.cpp:10:
/usr/include/stdlib.h:595:12: note: previous declaration 'int atexit(void (*)())'
  595 | extern int atexit (void (*__func) (void)) __THROW __nonnull ((1));
      |            ^~~~~~
p512.cpp:32:61: error: 'handler' was not declared in this scope
   32 | int atexit(c-atexit-handler* f) noexcept; int atexit(atexit-handler* f) noexcept;
      |                                                             ^~~~~~~
p512.cpp:32:70: error: 'f' was not declared in this scope
   32 | int atexit(c-atexit-handler* f) noexcept; int atexit(atexit-handler* f) noexcept;
      |                                                                      ^
p512.cpp:36:1: error: 'If' does not name a type
   36 | If a registered function invoked by exit exits via an exception, the function std::terminate is invoked (14.6.2).
      | ^~
p512.cpp:39:68: error: 'int at_quick_exit' redeclared as different kind of entity
   39 | int at_quick_exit(c-atexit-handler* f) noexcept; int at_quick_exit(atexit-handler* f) noexcept;
      |                                                                    ^~~~~~
/usr/include/stdlib.h:600:18: note: previous declaration 'int at_quick_exit(void (*)())'
  600 | extern "C++" int at_quick_exit (void (*__func) (void))
      |                  ^~~~~~~~~~~~~
p512.cpp:39:75: error: 'handler' was not declared in this scope
   39 | int at_quick_exit(c-atexit-handler* f) noexcept; int at_quick_exit(atexit-handler* f) noexcept;
      |                                                                           ^~~~~~~
p512.cpp:39:84: error: 'f' was not declared in this scope
   39 | int at_quick_exit(c-atexit-handler* f) noexcept; int at_quick_exit(atexit-handler* f) noexcept;
      |                   
```

## 検討事項(agenda)
コンパイルエラーを取るか、コンパイルエラーの理由を解説する。

<!-- リンクエラーの解説をする。clang++とg++の比較。意味のある出力。
コンパイルエラーを取るか、コンパイルエラーの理由を解説する。-->


# 参考資料(reference)

cpprefjp - C++日本語リファレンス

https://cpprefjp.github.io/

コンパイラの実装状況

https://cpprefjp.github.io/implementation-status.html


typedef は C++11 ではオワコン

https://qiita.com/Linda_pp/items/44a67c64c14cba00eef1

C99からC++14を駆け抜けるC++講座

https://qiita.com/yumetodo/items/e49a673afd9a3ecb81a8

## 自己参照(self reference)

コピペコンパイルエラーあるある

https://qiita.com/kaizen_nagoya/items/29c832de9d762aed2761

C++ Error Message Collection(1)does not name a type, 11 articles

https://qiita.com/kaizen_nagoya/items/acb9f1a9b5aad6df06bd

dockerにclang

https://qiita.com/kaizen_nagoya/items/8829ffeee397eda50e80

docker gnu(gcc/g++) and llvm(clang/clang++)

https://qiita.com/drafts/059874ea39c4de64c0f7

コンパイル用shell script C版(clangとgcc)とC++版(clang++とg++)

https://qiita.com/kaizen_nagoya/items/74220c0577a512c2d7da

Compare the contents of C++N4910:2022, C++N4741:2018 and C++N4606:2015

https://qiita.com/kaizen_nagoya/items/483246d40f98abff7ded

C++ sample list

https://qiita.com/kaizen_nagoya/items/54ad75b73825b7c04f86


clang++, g++コンパイルエラー方針の違いの例

https://qiita.com/kaizen_nagoya/items/ea6e5009fe126d270a82

astyle 使ってみた

https://qiita.com/kaizen_nagoya/items/3c9a87a781d53a1a23f3

C++N4606 Working Draft 2016, ISO/IEC 14882, C++ standardのコード断片をコンパイルするためにしていること
https://qiita.com/kaizen_nagoya/items/a8d7ee2f2e29e76c19c1

コンパイル用shell script C版(clangとgcc)とC++版(clang++とg++)
https://qiita.com/kaizen_nagoya/items/74220c0577a512c2d7da

Clang/Clang++(LLVM) gcc/g++(GNU) コンパイラ警告等比較
https://qiita.com/kaizen_nagoya/items/9a82b958cc3aeef0403f

C++2003とC++2017でコンパイルエラーになるならない事例集
https://qiita.com/kaizen_nagoya/items/a13ea3823441c430edff

Qiitaに投稿するCのStyle例(暫定)
https://qiita.com/kaizen_nagoya/items/946df1528a6a1ef2bc0d

cpprefjpのdecltypeをコンパイル試験
https://qiita.com/kaizen_nagoya/items/090909af702f0d5d8a67

MISRA C++ 5-0-16
https://qiita.com/kaizen_nagoya/items/7df2d4e05db724752a74

C++ Templates Part1 BASICS Chapter 3. Class Templates 3.2 Use of Class Template Stack stack1test.cpp
https://qiita.com/kaizen_nagoya/items/cd5fc49106fad5a4e9ed

ISO/IEC TS 17961:2013 C Secure Coding Rules(1) All list(to be confirmed)
https://qiita.com/kaizen_nagoya/items/54e056195c4f11b850a1

C言語（C++)に対する誤解、曲解、無理解、爽快。
https://qiita.com/kaizen_nagoya/items/3f3992c9722c1cee2e3a

C Puzzle Bookの有り難み5つ、C言語規格及びCコンパイラの特性を認識
https://qiita.com/kaizen_nagoya/items/d89a48c1536a02ecdec9

'wchar.h' file not found で困った clang++ macOS
https://qiita.com/kaizen_nagoya/items/de15cd46d657517fac11

Open POSIX Test Suiteの使い方を調べはじめました
https://qiita.com/kaizen_nagoya/items/644d5e407f5faf96e6dc

MISRA-C 2012 Referenceに掲載している文献の入手可能性を確認
https://qiita.com/kaizen_nagoya/items/96dc8b125e462d5575bb

どうやって MISRA Example Suiteをコンパイルするか
https://qiita.com/kaizen_nagoya/items/fbdbff5ff696e2ca7f00

MISRA C まとめ #include <misra_c.h>
https://qiita.com/kaizen_nagoya/items/f1a79a7cbd281607c7c9

「C++完全理解ガイド」の同意できること上位10
https://qiita.com/kaizen_nagoya/items/aa5744e0c4a8618c7671


 ＜この記事は個人の過去の経験に基づく個人の感想です。現在所属する組織、業務とは関係がありません。＞

# 文書履歴(document history)
ver. 0.01 初稿 　20220709