'[llvm-bugs] [Bug 47357] New: clang falls on a valid code with an error: 'no matching constructor for'

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List:       llvm-bugs
Subject:    [llvm-bugs] [Bug 47357] New: clang falls on a valid code with an error: 'no matching constructor for
From:       via llvm-bugs <llvm-bugs () lists ! llvm ! org>
Date:       2020-08-30 13:55:34
Message-ID: bug-47357-206 () http ! bugs ! llvm ! org/
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Date: Sun, 30 Aug 2020 06:55:34 -0700
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https://bugs.llvm.org/show_bug.cgi?id=47357

            Bug ID: 47357
           Summary: clang falls on a valid code with an error: 'no
                    matching constructor for initialization'
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs@nondot.org
          Reporter: tangyixuan@mail.dlut.edu.cn
                CC: blitzrakete@gmail.com, erik.pilkington@gmail.com,
                    llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk

Clang++ rejects the following code, while g++ accepts.

$ cat s.cpp
struct A
{
  int a;
};

void f()
{
  auto y = new A(1);
}

$ clang -v 
clang version 11.0.0 (https://github.com/llvm/llvm-project.git
ab4627364aefcaac751e757b721b7d07b48a545a)
Target: x86_64-unknown-linux-gnu
Thread model: posix

$ g++ -c -std=c++2a s.cpp
success.

$ clang++ -c std=c++2a s.cpp
s.cpp:8:16: error: no matching constructor for initialization of 'A'
  auto y = new A(1);
               ^ ~
s.cpp:1:8: note: candidate constructor (the implicit copy constructor) not
viable: no known conversion from 'int' to 'const A' for 1st argument
struct A
       ^
s.cpp:1:8: note: candidate constructor (the implicit move constructor) not
viable: no known conversion from 'int' to 'A' for 1st argument
struct A
       ^
s.cpp:1:8: note: candidate constructor (the implicit default constructor) not
viable: requires 0 arguments, but 1 was provided
1 error generated.

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Date: Sun, 30 Aug 2020 06:55:34 -0700
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<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - clang falls on a valid code with an error: 'no matching constructor \
for initialization'"  href="https://bugs.llvm.org/show_bug.cgi?id=47357">47357</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>clang falls on a valid code with an error: 'no matching constructor for \
initialization'  </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>C++2a
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs&#64;nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>tangyixuan&#64;mail.dlut.edu.cn
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>blitzrakete&#64;gmail.com, erik.pilkington&#64;gmail.com, \
llvm-bugs&#64;lists.llvm.org, richard-llvm&#64;metafoo.co.uk  </td>
        </tr></table>
      <p>
        <div>
        <pre>Clang++ rejects the following code, while g++ accepts.

$ cat s.cpp
struct A
{
  int a;
};

void f()
{
  auto y = new A(1);
}

$ clang -v 
clang version 11.0.0 (<a \
href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
 ab4627364aefcaac751e757b721b7d07b48a545a)
Target: x86_64-unknown-linux-gnu
Thread model: posix

$ g++ -c -std=c++2a s.cpp
success.

$ clang++ -c std=c++2a s.cpp
s.cpp:8:16: error: no matching constructor for initialization of 'A'
  auto y = new A(1);
               ^ ~
s.cpp:1:8: note: candidate constructor (the implicit copy constructor) not
viable: no known conversion from 'int' to 'const A' for 1st argument
struct A
       ^
s.cpp:1:8: note: candidate constructor (the implicit move constructor) not
viable: no known conversion from 'int' to 'A' for 1st argument
struct A
       ^
s.cpp:1:8: note: candidate constructor (the implicit default constructor) not
viable: requires 0 arguments, but 1 was provided
1 error generated.</pre>
        </div>
      </p>

      <hr>
      <span>You are receiving this mail because:</span>

      <ul>
          <li>You are on the CC list for the bug.</li>
      </ul>
    </body>
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