https://llvm.org/bugs/show_bug.cgi?id=26686
Bug ID: 26686
Summary: [MS ABI] dllimport'd class specialization w/ virtual
base causes IRGen to go off the rails
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: david.majne...@gmail.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
consider:
class A {
virtual void m_fn1();
};
template <typename>
struct B : virtual A {};
extern template class __declspec(dllimport) B<int>;
B<int> b;
run with:
~/llvm/Debug+Asserts/bin/clang -cc1 -x c++ -triple i686-pc-win32
-fms-extensions -S -o t.cpp -fno-rtti -emit-llvm -O2 -disable-llvm-optzns
we get:
Global is marked as dllimport, but not external
[2 x i32]* @"\01??_8?$B@H@@7B@"
fatal error: error in backend: Broken module found, compilation aborted!
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