https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63272
Bug ID: 63272
Summary: GCC should warn when using pointer to dead scoped
variable within the same function
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: jacob.benoit.1 at gmail dot com
Created attachment 33497
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33497&action=edit
testcase
Consider this testcase:
int foo(int i)
{
int *p = 0;
if (i)
{
int k = i;
p = &k;
} /* end of nested scope, k dies, p becomes a dangling pointer */
return p ? *p : 0; /* the compiler should warn that p points to dead k */
}
Neither Clang 3.4 nor GCC 4.8 currently generate a warning. Yet, since all is
local to this function, it seems like something that a compiler could easily
warn against, and that would have saved me some time today!
Also see LLVM bug: http://llvm.org/bugs/show_bug.cgi?id=20952
