http://llvm.org/bugs/show_bug.cgi?id=20725
Bug ID: 20725
Summary: Clang fails to propagate dll attribute to already
specialized template bases
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Consider the following example:
template <typename T> struct Template {};
template<> struct Template<int> { int foo() { return 42; } };
struct __declspec(dllexport) S : public Template<int> { };
int f(S s) {
return s.foo();
}
MSVC will export Template<int>::foo() here, because the dllexport attribute
from S gets propagated to the base class.
Clang currently fails with a warning:
d:\src\tmp\a.cc(5,41) : warning: propagating dll attribute to explicitly
specialized base class template without dll attribute is not supported
[-Wunsupported-dll-base-class-template]
struct __declspec(dllexport) S : public Template<int> { };
^
d:\src\tmp\a.cc(5,19) : note: attribute is here
struct __declspec(dllexport) S : public Template<int> { };
^
d:\src\tmp\a.cc(3,19) : note: class template 'Template<int>' was explicitly
specialized here
template<> struct Template<int> { int foo() { return 42; } };
^
Unfortunately, this does occur in real code so it would be nice if we could
support it.
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