[Bug c/19972] New: Return Local function pointer

[ppelissi at caramail dot com]

When returning local function pointer, it doesn't produce any warnings.
For example:

int *h() {
  int z;
  return &z;
}

int (*apply (int (*f) (const void *, const void *), void *a))(const void *)
{
  int zozo(const void * b) { return f(a,b); };
  return &zozo;
}

Compile with -O2 -Wall, it produces a warning for h:

ttt.c: In function 'h':
ttt.c:17: warning: function returns address of local variable

But not for `apply' (and it produces invalid code, which is normal).

GCC Version:
Using built-in specs.
Configured with: ../configure --prefix=/global/morpork/gcc-4.0-20050130
Thread model: posix
gcc version 4.0.0 20050130 (experimental)

-- 
           Summary: Return Local function pointer
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ppelissi at caramail dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19972