digitalmars.D.bugs - [Issue 22319] New: vtable not exported for extern(C++) class under
- d-bugmail puremagic.com (53/53) Sep 18 2021 https://issues.dlang.org/show_bug.cgi?id=22319
https://issues.dlang.org/show_bug.cgi?id=22319 Issue ID: 22319 Summary: vtable not exported for extern(C++) class under Linux Product: D Version: D2 Hardware: x86_64 OS: Linux Status: NEW Severity: normal Priority: P1 Component: dmd Assignee: nobody puremagic.com Reporter: tim.dlang t-online.de 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. --
Sep 18 2021