[Bug c++/82146] New: if (&pdo) is always true error

[maasoftware at yandex dot ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82146

            Bug ID: 82146
           Summary: if (&pdo) is always true error
           Product: gcc
           Version: 6.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: maasoftware at yandex dot ru
  Target Milestone: ---

//
// Linux Debian 9 Stretch x64 g++ 6.3.0
// -O2 or -O3 optimization option
// g++ -c -pipe -W -O3 -I. -I.. -I/usr/local/include -o file.o file.cpp
//
int CMyClass::MyFunc(_qword FileNum, CMaaString &Path, CMaaXmlDocument &doc)
{
    ....
    if (CMaaFile::IsAFile(FileName))
    {
        if   (&Path)
        {
            Path = FileName; // GPFault when Path is passed as *(CMaaString
*)NULL
        }
        doc = _doc;
        return true;
    }
    ....
}

int CMyClass::MyFunc2()
{
    ...
    return MyFunc(Num, *(CMaaString *)NULL, doc); // produces GPF
    ...
}