http://llvm.org/bugs/show_bug.cgi?id=18733
Bug ID: 18733
Summary: Bogus warning with -Wweak-template-vtables
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Given
---------------------------
template<typename T>
class foo {
virtual ~foo() {}
};
extern template class foo<int>;
template class foo<int>;
----------------------------
clang warns:
-------------------------------
test.cpp:6:23: warning: explicit template instantiation 'foo<int>' will emit a
vtable in every translation unit [-Wweak-template-vtables]
extern template class foo<int>;
^
1 warning generated.
------------------------------
note that the warning points to the explicit template instantiation
declaration, but is triggered by the definition. This should probably be
checking if the definition is in a header. In a .cpp file there is only one
translation unit that sees it.
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