http://llvm.org/bugs/show_bug.cgi?id=20137
Bug ID: 20137
Summary: explicit instantiation with dll attribute of class
template with different dll attribute triggers assert
Product: clang
Version: trunk
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 code:
template <typename T> struct __declspec(dllimport) S { T f() { return T(); }
};
template struct __declspec(dllexport) S<int>;
I think there are two problems here:
We inherit the DLL attribute to the template members once the template
declaration is complete. So S::f gets marked dllimport too early. We might want
to delay running checkDLLAttributes() until instantiation.
When we instantiate S, we merge the dll attributes from the pattern (dllimport)
and the instantiation (dllexport), and end up with S<int> having both
attributes, causing the assert. I think that if the instantiation has an
attribute, that should take precedence.
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