[LLVMbugs] [Bug 20758] New: clang accepts new dll attributes on explicit instantiation of already instantiated templates

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20758

            Bug ID: 20758
           Summary: clang accepts new dll attributes on explicit
                    instantiation of already instantiated templates
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: hans at chromium.org
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Consider:

template <typename T> void f() {}
void foo() { f<int>(); }
template void __declspec(dllimport) f<int>();

or

template <typename T> struct S { void f() {} };
void bar(S<int> s) { s.f(); }
template struct __declspec(dllexport) S<int>; 

Clang accepts the code, but the attribute doesn't have any effect since it's
applied too late.

I think this would be hard for us to handle, so we should warn and drop the
attribute.

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