[LLVMbugs] [Bug 23770] New: Propagating dll attributes to template bases doesn't work for explicit instantiation

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23770

            Bug ID: 23770
           Summary: Propagating dll attributes to template bases doesn't
                    work for explicit instantiation
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            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
            Blocks: 13707
    Classification: Unclassified

Consider:

  template <typename T> struct BaseTemplate {
      void f() {}
  };

  template <typename T> struct Template : BaseTemplate<T> {
  };

  extern template struct Template<int>;
  template struct __declspec(dllexport) Template<int>;


MSVC will export BaseTemplate<int>::f() here, but clang-cl fails to do so.

(This is really just another aspect of Issue 23667.)

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