Undefined reference to `__dynamic_cast' when compiling with `-fsantize=vptr -static'

eddiekuo@andestech.com eddiekuo@andestech.com
Tue Sep 1 06:45:39 GMT 2020


I compiled the following cpp file with `-fsantize=vptr -static'.

struct A {
  virtual ~A() {};
};

int main() { A a; }

There would have the following output error:
/usr/lib/gcc/x86_64-linux-gnu/7/libubsan.a(ubsan_type_hash_itanium.o): In function `isDerivedFromAtOffset(__cxxabiv1::__class_type_info const*, __cxxabiv1::__class_type_info const*, long)':
(.text+0x52): undefined reference to `__dynamic_cast'
(.text+0x5e): undefined reference to `typeinfo for __cxxabiv1::__vmi_class_type_info'
(.text+0x6b): undefined reference to `__dynamic_cast'
/usr/lib/gcc/x86_64-linux-gnu/7/libubsan.a(ubsan_type_hash_itanium.o): In function `findBaseAtOffset(__cxxabiv1::__class_type_info const*, long)':
(.text+0x151): undefined reference to `__dynamic_cast'
(.text+0x15d): undefined reference to `typeinfo for __cxxabiv1::__vmi_class_type_info'
(.text+0x16a): undefined reference to `__dynamic_cast'
/usr/lib/gcc/x86_64-linux-gnu/7/libubsan.a(ubsan_type_hash_itanium.o): In function `__ubsan::checkDynamicType(void*, void*, unsigned long)':
(.text+0x293): undefined reference to `__dynamic_cast'

There has a same result with gcc11.0.0.
Is it a correct behavior for C++?

Best Regard,
Eddie Kuo
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