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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Unavailable function incorrectly marked as deleted from within a scoped marked as unavailable"
href="https://bugs.llvm.org/show_bug.cgi?id=40995">40995</a>
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<th>Summary</th>
<td>Unavailable function incorrectly marked as deleted from within a scoped marked as unavailable
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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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
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>ldionne@apple.com
</td>
</tr>
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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>
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<pre>Functions marked as unavailable appear as being deleted even when from a scope
that is unavailable too:
$ cat <<EOF | clang++ -xc++ - -fsyntax-only -std=c++11
#include <type_traits>
#define UNAVAILABLE
__attribute__((availability(macosx,strict,introduced=99.99)))
struct Bar { UNAVAILABLE Bar(int, int) { } };
struct UNAVAILABLE Foo {
// this is performed in a scope marked as unavailable
static_assert(std::is_constructible<Bar, int, int>::value, ""); // this
fires
};
EOF
I think the static_assert fires because the code is equivalent to marking
`Bar(int,int) = delete`, which would then fail the static_assert. However,
since `Bar(int, int)` is used (in std::is_constructible) from a context that is
transitively unavailable (because Foo is unavailable), I would expect `Bar(int,
int)` not to be marked deleted in that context.</pre>
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