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/* Скомпилируется без проблем, но результат работы непредсказуем */
int dummyFunc();

int main()
{
    cout << "Hello World!" << endl;

    int num = dummyFunc();
    cout << num << endl;

    return 0;
}

//-----------------------------------------------------------------------------
int dummyFunc() {
    int tstamp = time(NULL);
    ++tstamp;
    --tstamp;

    void* ptr;
}

>g++ --version
g++.EXE (Built by MinGW-builds project) 4.7.2
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


>cat 3.cpp
int f(int i) {
  if (i > 0)
    return 1;
}

int main() {
  f(1);
}

>g++ -Werror=return-type 3.cpp
3.cpp: In function 'int f(int)':
3.cpp:4:1: error: control reaches end of non-void function [-Werror=return-type]
cc1plus.exe: some warnings being treated as errors

QMAKE_CXXFLAGS +=-Werror=return-type