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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Availability attribute incorrectly triggers when function is called in a default argument of an unavailable function"
href="https://bugs.llvm.org/show_bug.cgi?id=40991">40991</a>
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<th>Summary</th>
<td>Availability attribute incorrectly triggers when function is called in a default argument of an unavailable function
</td>
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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
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Frontend
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>ldionne@apple.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>When defining a function `f` as unavailable, uses of other unavailable
functions within the body of `f` are not flagged (because the top-level
function is unavailable). However, using an unavailable function as a default
argument triggers an error:
$ cat <<EOF | clang++ -xc++ -
__attribute__((unavailable)) int bar() { return 0; }
__attribute__((unavailable)) void foo(int = bar()) { }
int main() { }
EOF
Output:
<stdin>:2:45: error: call to unavailable function 'bar':
__attribute__((unavailable)) void foo(int = bar()) { }
^~~
<stdin>:1:34: note: candidate function has been explicitly made unavailable
__attribute__((unavailable)) int bar() { return 0; }
^
I think the call to bar() should not be flagged since foo() is marked
unavailable.</pre>
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