'[llvm-bugs] [Bug 47365] New: Can not use a struct type of base containing both enum and protected de'

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List:       llvm-bugs
Subject:    [llvm-bugs] [Bug 47365] New: Can not use a struct type of base containing both enum and protected de
From:       via llvm-bugs <llvm-bugs () lists ! llvm ! org>
Date:       2020-08-31 13:33:17
Message-ID: bug-47365-206 () http ! bugs ! llvm ! org/
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--1598880798.70fEac5.12114
Date: Mon, 31 Aug 2020 06:33:18 -0700
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https://bugs.llvm.org/show_bug.cgi?id=47365

            Bug ID: 47365
           Summary: Can not use a struct type of base containing both enum
                    and protected destructor
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs@nondot.org
          Reporter: tangyixuan@mail.dlut.edu.cn
                CC: blitzrakete@gmail.com, dgregor@apple.com,
                    erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org,
                    richard-llvm@metafoo.co.uk

The following code is accepted by g++, while is rejected by clang++.

$ cat s.cpp

enum class A {
};

struct B {
    A a;
protected:
    ~B() = default;
};

struct C : B {
};

int main(){
    C c{};
}

$ g++ -c s.cpp
success.

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

$ clang++ -c s.cpp

s.cpp:14:9: error: temporary of type 'B' has protected destructor
    C c{};
        ^
s.cpp:7:5: note: declared protected here
    ~B() = default;  
    ^
1 error generated.

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--1598880798.70fEac5.12114
Date: Mon, 31 Aug 2020 06:33:18 -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 - Can not use a struct type of base containing both enum and protected \
destructor"  href="https://bugs.llvm.org/show_bug.cgi?id=47365">47365</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Can not use a struct type of base containing both enum and protected \
destructor  </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++
          </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, dgregor&#64;apple.com, \
erik.pilkington&#64;gmail.com, llvm-bugs&#64;lists.llvm.org, \
richard-llvm&#64;metafoo.co.uk  </td>
        </tr></table>
      <p>
        <div>
        <pre>The following code is accepted by g++, while is rejected by clang++.

$ cat s.cpp

enum class A {
};

struct B {
    A a;
protected:
    ~B() = default;
};

struct C : B {
};

int main(){
    C c{};
}

$ g++ -c s.cpp
success.

$ 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

$ clang++ -c s.cpp

s.cpp:14:9: error: temporary of type 'B' has protected destructor
    C c{};
        ^
s.cpp:7:5: note: declared protected here
    ~B() = default;  
    ^
1 error generated.</pre>
        </div>
      </p>

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

      <ul>
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