Missing warning about uninitialized variable

[David Sveningsson]

Hi, I recently ran into an issue with an uninitialized pointer which I 
expected g++ to warn about.

class Foo {
public:
         Foo* a(){ return this; }
};

int main(int argc, const char*[] ){
         for ( int i = 0; i < 6; i++ ){
                 Foo* foo = foo->a();
         }
}

This code compiles without any warnings (with -Wall) with both g++-4.4.2 
and g++-4.2.4. Removing the for-loop gives me a warning as expected:

foo.cpp: In function ‘int main(int, const char**)’:
foo.cpp:8: warning: ‘foo’ is used uninitialized in this function

I know this case is a bit silly but it happened because of a typo and 
went unnoticed for a while.

Is my reasoning flawed or should g++ emit a warning?