[Bug gcov-profile/96919] New: [GCOV] uncovered line of stack allocation while using virutal destructor

[youngseok.roh.de at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96919

            Bug ID: 96919
           Summary: [GCOV] uncovered line of stack allocation while using
                    virutal destructor
           Product: gcc
           Version: 8.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: gcov-profile
          Assignee: unassigned at gcc dot gnu.org
          Reporter: youngseok.roh.de at gmail dot com
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---

I have different result since GCC8. It looks like connecting to the virtual
destructor.

<~ GCC 7.4.0>
$ cat main.cpp.gcov 
        -:    0:Source:main.cpp
        -:    0:Graph:main.gcno
        -:    0:Data:main.gcda
        -:    0:Runs:1
        -:    0:Programs:1
        -:    1:#include "hello.h"
        -:    2:
        1:    3:int main(int argc, char* argv[]) {
        2:    4:  Hello hello;
        1:    5:  hello.foo();
        1:    6:  return 0;
        -:    7:}
        -:    8:
<GCC 8.2.0 ~>
$ cat main.cpp.gcov 
        -:    0:Source:main.cpp
        -:    0:Graph:main.gcno
        -:    0:Data:main.gcda
        -:    0:Runs:1
        -:    0:Programs:1
        -:    1:#include "hello.h"
        -:    2:
        1:    3:int main(int argc, char* argv[]) {
    #####:    4:  Hello hello;
        1:    5:  hello.foo();
        1:    6:  return 0;
        -:    7:}
        -:    8:

Example code is here, and commands as well.
$ cat hello.h
class Base {
public:
  Base() = default;
  virtual ~Base() = default;
  virtual void foo() = 0;
};
class Hello : public Base {
public:
  Hello() = default;
  ~Hello() = default;
  void foo() override;
};

$ cat hello.cpp 
#include "hello.h"
#include <iostream>

using namespace std;

void Hello::foo() {
  cout << "hello" << endl;
}

$ cat main.cpp
#include "hello.h"

int main(int argc, char* argv[]) {
  Hello hello;
  hello.foo();
  return 0;
}

g++ -g -c --coverage -O0 -std=c++11 hello.cpp
g++ -g -c --coverage -O0 -std=c++11 main.cpp
g++ -o test hello.o main.o --coverage -O0