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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Miscompiled direct base initialization in inherited constructor from virtual base of same type"
href="https://bugs.llvm.org/show_bug.cgi?id=34426">34426</a>
</td>
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<th>Summary</th>
<td>Miscompiled direct base initialization in inherited constructor from virtual base of same type
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Keywords</th>
<td>miscompilation
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hstong@ca.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>When a constructor is inherited from a virtual base and the class from which
said constructor is inherited is also a direct base of the complete object
being constructed, the initialization of the direct base is supposed to be a
default initialization, but Clang seems to treat it like the virtual base.
### SOURCE (<stdin>):
extern "C" int printf(const char *, ...);
struct A { A(int); A() = default; };
A::A(int x) { printf("%s: %d\n", __PRETTY_FUNCTION__, x); }
struct B : virtual A { using A::A; };
struct C : B, A { using B::B; };
int main(void) { C c(42); }
### COMPILER INVOCATION:
clang++ -Wall -Wextra -Wno-inaccessible-base -xc++ -std=c++1z -o a.out -
### COMPILER OUTPUT:
(Clean compile)
### ACTUAL RUN OUTPUT (./a.out):
A::A(int): 42
A::A(int): 42
### EXPECTED RUN OUTPUT:
A::A(int): 42
### COMPILER VERSION INFO (clang++ -v):
clang version 6.0.0 (<a href="https://github.com/llvm-mirror/clang.git">https://github.com/llvm-mirror/clang.git</a>
9b13d907c509a53fd938dcc777bb7dd097cea4c0)
(<a href="https://github.com/llvm-mirror/llvm.git">https://github.com/llvm-mirror/llvm.git</a>
707fb1cf0ca99d98c59f1ae87b7e0ff9b2dd0c8b)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/wandbox/clang-head/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Selected multilib: .;@m64</pre>
</div>
</p>
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