[Bug c++/64346] New: gcc generates incorrect debug info for ctor/dtor

[dehao at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64346

            Bug ID: 64346
           Summary: gcc generates incorrect debug info for ctor/dtor
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dehao at gcc dot gnu.org

#cat a.cc
#include <iostream>
#include <memory>

class ABC {
public:
 ABC() {printf("abc\n");}
 ~ABC() {printf("xyz\n");}
};

int foo() {
  std::unique_ptr<ABC> a(new ABC());
}

#g++4.8 a.cc -c -O2 -std=c++11 -g -fno-exceptions
#addr2line -e a.o -i -f 0x13
_ZN3ABCC1Ev
/usr/local/google/home/dehao/gcc/gcc-4_9/debug/a.cc:5
_Z3foov
/usr/local/google/home/dehao/gcc/gcc-4_9/debug/a.cc:10

#g++4.9 a.cc -c -O2 -std=c++11 -g -fno-exceptions
#addr2line -e a.o -i -f 0x13
_ZN3ABCC4Ev
/usr/local/google/home/dehao/gcc/gcc-4_9/debug/a.cc:5
_Z3foov
/usr/local/google/home/dehao/gcc/gcc-4_9/debug/a.cc:10

#g++4.9 a.cc -c -O0 -std=c++11 -g -fno-exceptions
#nm a.o |grep ABCC
0000000000000000 W _ZN3ABCC1Ev
0000000000000000 W _ZN3ABCC2Ev
0000000000000000 n _ZN3ABCC5Ev

Note that for the gcc 4.9 version and later, without any optimization
_ZN3ABCC4Ev does not exists in the symbol table. So we expect either
_ZN3ABCC1Ev or _ZN3ABCC2Ev in the addr2line result.