'[LLVMbugs] [Bug 19010] New: Empty base of class with trivial default constructor is not initialized '

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List:       llvm-bugs
Subject:    [LLVMbugs] [Bug 19010] New: Empty base of class with trivial default constructor is not initialized 
From:       bugzilla-daemon () llvm ! org
Date:       2014-02-28 20:49:35
Message-ID: bug-19010-206 () http ! llvm ! org/bugs/
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--1393620575.fdE4AbD2.25894
Date: Fri, 28 Feb 2014 14:49:35 -0600
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http://llvm.org/bugs/show_bug.cgi?id=19010

            Bug ID: 19010
           Summary: Empty base of class with trivial default constructor
                    is not initialized in constant expression
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs@nondot.org
          Reporter: st@quanttec.com
                CC: dgregor@apple.com, llvmbugs@cs.uiuc.edu
    Classification: Unclassified

The trunk version of clang fails to compile the following test:

struct Empty {};

struct Empty2 : Empty {};

struct Test : Empty2 {
  constexpr Test() {}
};

void test() {
  constexpr Test t;    
}

> clang++ --std=c++1y test.cpp
test.cpp:10:18: error: constexpr variable 't' must be initialized by a constant
expression
  constexpr Test t;
                 ^
test.cpp:10:18: note: subobject of type 'Empty' is not initialized
1 error generated.

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--1393620575.fdE4AbD2.25894
Date: Fri, 28 Feb 2014 14:49:35 -0600
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<html>
    <head>
      <base href="http://llvm.org/bugs/" />
    </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 --- - Empty base of class with trivial default constructor is not \
initialized in constant expression"  \
href="http://llvm.org/bugs/show_bug.cgi?id=19010">19010</a>  </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Empty base of class with trivial default constructor is not initialized \
in constant expression  </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>Windows NT
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>C++11
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>st&#64;quanttec.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor&#64;apple.com, llvmbugs&#64;cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>The trunk version of clang fails to compile the following test:

struct Empty {};

struct Empty2 : Empty {};

struct Test : Empty2 {
  constexpr Test() {}
};

void test() {
  constexpr Test t;    
}

<span class="quote">&gt; clang++ --std=c++1y test.cpp</span >
test.cpp:10:18: error: constexpr variable 't' must be initialized by a constant
expression
  constexpr Test t;
                 ^
test.cpp:10:18: note: subobject of type 'Empty' is not initialized
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>
</html>

--1393620575.fdE4AbD2.25894--

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