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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Bad diagnostic when trying to copy an uncopyable type"
href="https://bugs.llvm.org/show_bug.cgi?id=41819">41819</a>
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<th>Summary</th>
<td>Bad diagnostic when trying to copy an uncopyable type
</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>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>barry.revzin@gmail.com
</td>
</tr>
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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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<p>
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<pre>Same issue as gcc's bug (<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90413">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90413</a>):
template<class T>
struct Bar {
Bar() {}
Bar(const Bar&) {
static_assert(sizeof(T) == 1, "");
}
};
template<class T>
struct Foo {
Foo() {}
#ifdef DEFAULT
Foo(const Foo&) = default;
#else
Foo(const Foo& o) : b(o.b) {}
#endif
Bar<T> b;
};
int main() {
Foo<int> f;
Foo<int> g = f;
}
Without -DDEFAULT, the error points to the offending line (you can see the
construction of 'g' in the error trace):
source>:5:9: error: static_assert failed due to requirement 'sizeof(int) == 1'
""
static_assert(sizeof(T) == 1, "");
^ ~~~~~~~~~~~~~~
<source>:14:25: note: in instantiation of member function 'Bar<int>::Bar'
requested here
Foo(const Foo& o) : b(o.b) {}
^
<source>:21:18: note: in instantiation of member function 'Foo<int>::Foo'
requested here
Foo<int> g = f;
^
1 error generated.
Compiler returned: 1
With -DDEFAULT, the error does not point to the offending line at all:
source>:5:9: error: static_assert failed due to requirement 'sizeof(int) == 1'
""
static_assert(sizeof(T) == 1, "");
^ ~~~~~~~~~~~~~~
<source>:12:5: note: in instantiation of member function 'Bar<int>::Bar'
requested here
Foo(const Foo&) = default;
^
1 error generated.
Compiler returned: 1
In larger examples, this makes it very hard to determine the actual source of
problem -- since it doesn't even appear.</pre>
</div>
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