🚀 go-pugleaf

Christoph Martin (martin@perdita) writes:

: In the following code gcc and g++ both find the uninitialized variable
: y but not i and j.

 [ .. code deleted .. ]

: gcc -Wall -O uninit.c -o uninit
: uninit.c: In function `bar':
: uninit.c:7: warning: `y' may be used uninitialized in this function

: What is the problem?

No problem .. hint: add '-finline-functions' and no warnings will be issued
at all :-). 

The optimizer (on which flow and usage analysis depends) has removed any
instances of the variables because they are obviously (to the compiler) not
being used for anything with any effect out of the 'local' context. 

Stated another way, this means that without the optimizer in play, the
compiler doesn't have sufficient information to judge if something's
initialized or not. With it, the variables cease to exist at all, 

	michael