/* 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++ --versiong++.EXE (Built by MinGW-builds project) 4.7.2Copyright (C) 2012 Free Software Foundation, Inc.This is free software; see the source for copying conditions. There is NOwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.>cat 3.cppint f(int i) { if (i > 0) return 1;}int main() { f(1);}>g++ -Werror=return-type 3.cpp3.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
C++ (Qt)while(!asleep()) sheep++;
