mstorsjo added a comment.
Just for the record, the issue seems to be this:
$ cat cpp-ret-c.cpp
template<class T> class MyClass {
public:
T a;
};
extern "C" MyClass<int> unmangledFunction();
$ cl -c cpp-ret-c.cpp
cpp-ret-c.cpp
cpp-ret-c.cpp(5): error C2526: 'unmangledFunction': C linkage function cannot
return C++ class 'MyClass<int>'
cpp-ret-c.cpp(5): note: see declaration of 'MyClass<int>'
$ cat cpp-ret-c2.cpp
template<class T> class MyClass {
public:
T a;
};
MyClass<int> unusedFunc() { return MyClass<int>{0}; }
extern "C" MyClass<int> unmangledFunction();
$ cl -c cpp-ret-c2.cpp
cpp-ret-c2.cpp
So this construct, in MSVC, requires that the problematic return type template
already has been instantiated somewhere else first. The case in the python
plugin works, but it has been copied to the Lua plugin too, where it fails.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D70830/new/
https://reviews.llvm.org/D70830
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