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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Default parameter of unique_ptr instantiates causing failure with incomplete type:"
href="https://bugs.llvm.org/show_bug.cgi?id=42303">42303</a>
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<th>Summary</th>
<td>Default parameter of unique_ptr instantiates causing failure with incomplete type:
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</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>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>erich.keane@intel.com
</td>
</tr>
<tr>
<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>#include <memory>
struct Base;
class Class {
Class ( std::unique_ptr<Base>&& combat_targets = nullptr);
};
The above reproducer results in:
bash-4.2$ ../../llvm-project/build/bin/clang++ --version
clang version 9.0.0 (/iusers/ekeane1/workspaces/llvm-project/clang
689509edab4d073ec3bca7d433808ae48a6cddd8)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir:
/export/iusers/ekeane1/workspaces/xmain/repro/../../llvm-project/build/bin
bash-4.2$ ../../llvm-project/build/bin/clang++ test.cpp
In file included from test.icx.cpp:1:
In file included from
/usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../include/c++/4.8.5/memory:81:
/usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../include/c++/4.8.5/bits/unique_ptr.h:65:16:
error: invalid application of 'sizeof' to an incomplete type 'Base'
static_assert(sizeof(_Tp)>0,
^~~~~~~~~~~
/usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../include/c++/4.8.5/bits/unique_ptr.h:184:4:
note: in instantiation of member function
'std::default_delete<Base>::operator()' requested here
get_deleter()(__ptr);
^
/usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../include/c++/4.8.5/bits/unique_ptr.h:157:50:
note: in instantiation of member function 'std::unique_ptr<Base,
std::default_delete<Base> >::~unique_ptr' requested here
constexpr unique_ptr(nullptr_t) noexcept : unique_ptr() { }
^
test.icx.cpp:3:12: note: forward declaration of 'Base'
This appears to be a regression, as current godbolt (r363523) doesn't seem to
repro the issue. <a href="https://godbolt.org/z/Z_2tlY">https://godbolt.org/z/Z_2tlY</a>
We seem to be instantiating the default parameter before the function is used,
so this no longer works (it does in GCC as well). Is this intentional?</pre>
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