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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 - clang may not compile Chromium code"
href="https://bugs.llvm.org/show_bug.cgi?id=38293">38293</a>
</td>
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<tr>
<th>Summary</th>
<td>clang may not compile Chromium code
</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>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<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@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>zhonghao@pku.org.cn
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>A user complained that gcc cannot compile the Chromium code. The bug report is:
<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64251">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64251</a>
The reduced code is as follow:
class DictionaryValue {};
template <typename T> void CreateValue(T) {
DictionaryValue(0);
CreateValue(0);
}
gcc 5.0 produces the following error messages:
markus@x4 /tmp % checking-release/g++ -std=c++11 -c foo.ii
markus@x4 /tmp % checking-yes/g++ -std=c++11 -c foo.ii
foo.ii: In instantiation of ‘void CreateValue(T) [with T = int]’:
foo.ii:4:17: required from here
foo.ii:3:4: error: no matching function for call to
‘DictionaryValue::DictionaryValue(int)’
DictionaryValue(0);
^
foo.ii:1:7: note: candidate: constexpr DictionaryValue::DictionaryValue()
class DictionaryValue {};
^
foo.ii:1:7: note: candidate expects 0 arguments, 1 provided
foo.ii:1:7: note: candidate: constexpr DictionaryValue::DictionaryValue(const
DictionaryValue&)
foo.ii:1:7: note: no known conversion for argument 1 from ‘int’ to ‘const
DictionaryValue&’
foo.ii:1:7: note: candidate: constexpr
DictionaryValue::DictionaryValue(DictionaryValue&&)
foo.ii:1:7: note: no known conversion for argument 1 from ‘int’ to
‘DictionaryValue&&’
After the bug is fixed, the latest gcc accepts the code.
I tried clang++ to compile the reduced code. It reports the following error:
code0.cpp:3:2: error: no matching conversion for functional-style cast from
'int' to 'DictionaryValue'
DictionaryValue(0);
^~~~~~~~~~~~~~~~~
code0.cpp:1:7: note: candidate constructor (the implicit copy constructor) not
viable: no known conversion from 'int' to 'const DictionaryValue' for 1st
argument
class DictionaryValue {};
^
code0.cpp:1:7: note: candidate constructor (the implicit move constructor) not
viable: no known conversion from 'int' to 'DictionaryValue' for 1st
argument
class DictionaryValue {};
^
code0.cpp:1:7: note: candidate constructor (the implicit default constructor)
not viable: requires 0 arguments, but 1 was provided
1 error generated.
Even if it is not a bug in clang, it indicates that clang cannot compile the
Chromium code either, which needs to be repaired.</pre>
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