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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Wsizeof-array-div false positive when divisor is sizeof reference type"
href="https://bugs.llvm.org/show_bug.cgi?id=47495">47495</a>
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<th>Summary</th>
<td>Wsizeof-array-div false positive when divisor is sizeof reference type
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>sir.venceslas@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>Hi,
I found a bug where clang reports a false positive here:
int my_function()
{
int array[10];
const int narray = sizeof(array)/sizeof(int&);
return narray;
}
clang output:
<stdin>:4:37: warning: expression does not compute the number of elements in
this array; element type is 'int', not 'int &' [-Wsizeof-array-div]
const int narray = sizeof(array)/sizeof(int&);
~~~~~ ^
<stdin>:3:9: note: array 'array' declared here
int array[10];
^
<stdin>:4:37: note: place parentheses around the 'sizeof(int &)' expression to
silence this warning
const int narray = sizeof(array)/sizeof(int&);
^
1 warning generated.
The standard says this about sizeof: "When applied to a reference or a
reference type, the result is the size of the referenced type."
I'm getting this even on the trunk version on godbolt.com
(<a href="https://godbolt.org/z/Pb4adf">https://godbolt.org/z/Pb4adf</a>).</pre>
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