> book.c: In function 'entry_from_file':
> book.c:391:19: warning: 'r' may be used uninitialized in this function [-Wuninitialized]
> book.c:400:12: note: 'r' was declared here
> The one in book.c is a red herring: a pointer to the variable is
passed to a routine that initializes it,
> but the compiler cannot see that. The warning can be safely
suppressed by just declaring as r=0.
It sure looks like a genuine bug to me. The variable r is declared in
function entry_from_file() line 400, and is never initialized before it
is used in function int_from_file() line 391. Just like gcc says - it
indeed does some interprocedural analysis.