[llvm-bugs] [Bug 39017] New: -Wreturn-stack-address false negative when address is stored in a local variable

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39017

            Bug ID: 39017
           Summary: -Wreturn-stack-address false negative when address is
                    stored in a local variable
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: skvadrik at gmail.com
                CC: llvm-bugs at lists.llvm.org

On the following code, I get -Wreturn-stack-address warning only on 'bar', but
not on 'foo' (even with optimization level -O3):


// 1.c
int *foo(void)
{
  int n = 123;
  int *p;
  p = &n;
  return p;
}

int *bar(void)
{
  int n = 123;
  return &n;
}


$ clang -Wreturn-stack-address -c 1.c -O3
1.c:12:11: warning: address of stack memory associated with local variable 'n'
returned [-Wreturn-stack-address]
  return &n;
          ^
1 warning generated.

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