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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - -Wignored-qualifier noisy on common pattern"
href="http://llvm.org/bugs/show_bug.cgi?id=21348">21348</a>
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<th>Summary</th>
<td>-Wignored-qualifier noisy on common pattern
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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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>chisophugis@gmail.com
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>In libraries that make use of vectors, it is common to parametrize the type
"best type for passing a vector as an argument" (generally either T or T&). I
believe this has to do with ABI and calling convention preferences; why this is
done is not the topic of this bug though. This also can extend to Point classes
which thinly wrap a vector.
For example (using int instead of a vector type):
#if ....
typedef int &IntArg;
#else // (assume this branch isn't taken)
typedef int IntArg;
#endif
int foo(const IntArg I) {
return I * 3;
}
Currently, clang's -Wignored-qualifiers fires on such code due to the const
applying to the &. This means that everywhere that `const IntArg` is used
(which is frequently), -Wignored-qualifiers fires, which is excessively noisy.
I think it would make sense to fire only in the case where the user has
explicitly written a & with a const applied to it.</pre>
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