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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang-cl: conversion from 'long' to 'const QVariant' is ambiguous"
href="https://llvm.org/bugs/show_bug.cgi?id=31647">31647</a>
</td>
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<th>Summary</th>
<td>Clang-cl: conversion from 'long' to 'const QVariant' is ambiguous
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>4.0
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</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>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jvapen@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=17843" name="attach_17843" title="Reproduction">attachment 17843</a> <a href="attachment.cgi?id=17843&action=edit" title="Reproduction">[details]</a></span>
Reproduction
The attachment contains a smaller reproduction scenario.
Problem occurred during conversion of MSVC codebase with Qt to clang-cl. (More
specially with the QVariant)
Using clang-cl from SVN r291454 (9 January 2017) (64 bit version from
<a href="http://llvm.org/builds/">http://llvm.org/builds/</a>)
namespace {
struct A {
A(int) {}
A(unsigned int) {}
A(long long) {}
A(unsigned long long) {}
A(bool) {}
A(float) {}
A(double) {}
};
long getLong() { return 42; }
void f(const A &) {}
}
int main(int, char **)
{
f(getLong());
return 0;
}
<span class="quote">> Calling f is ambiguous</span >
However, if I change the main function to the following, clang-cl compiles the
code.
int main(int, char **)
{
long l = 42;
f(l);
return 0;
}
MSVC compiles both versions of the code.
I've also checked with:
static_assert(sizeof(int) == sizeof(long), "We expect int to be the same size
as long");
In both compilers, this assert evaluates to true.</pre>
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