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Language

C++

Compiler

clang HEAD 12.0.0 (https://github.com/llvm/llvm-project.git 344a3d0bc0fb0868b519c3342b4982d6121eece3)

Options
Warnings
Boost 1.73.0
C++2a
no pedantic

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// C4190.cpp
// compile with: /W1 /LD
struct X
{
int i;
X ();
virtual ~X ();
};

extern "C" X func (); // C4190

int main() {}

$ clang++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.73.0/clang-head/include -std=c++2a 
prog.cc:10:14: warning: 'func' has C-linkage specified, but returns user-defined type 'X' which is incompatible with C [-Wreturn-type-c-linkage]
extern "C" X func ();   // C4190
             ^
1 warning generated.
Exit Code:
0