A class without constructor can't be created under Linux from C++ if it is defined in D.
//////////////// testvbtl.d //////////////////
extern(C++) class C
{
int f()
{
return 1;
}
}
extern(C++) C createC();
void main()
{
C c = new C;
assert(c.f() == 1);
}
//////////////// testvbtl.cpp ////////////////
class C
{
public:
virtual void f();
};
C *createC()
{
return new C;
}
//////////////////////////////////////////////
% g++ -c testvbtl.cpp -o testvbtl.cpp.o
% dmd -L-lstdc++ testvbtl.d testvbtl.cpp.o
/usr/bin/ld: testvbtl.cpp.o: warning: relocation against `_ZTV1C' in read-only section `.text._ZN1CC2Ev[_ZN1CC5Ev]'
/usr/bin/ld: testvbtl.cpp.o: in function `C::C()':
testvbtl.cpp:(.text._ZN1CC2Ev[_ZN1CC5Ev]+0xb): undefined reference to `vtable for C'
/usr/bin/ld: warning: creating DT_TEXTREL in a PIE
collect2: error: ld returned 1 exit status
Error: linker exited with status 1
The C++ part seems to need the symbol _ZTV1C with the virtual table, but the D part does not export it using this name.
Comment #1 by robert.schadek — 2024-12-13T19:18:31Z