[Bug tree-optimization/18487] New: Warnings for pure and const functions that are not actually pure or const

["kazu at cs dot umass dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

It would be nice if GCC can issue warnings for pure or const functions
that are not actually pure or const.

int foo (int) __attribute__ ((pure));
int bar (int) __attribute__ ((const));

int g;

int
foo (int a)
{
  g = a; /* A pure function is not supposed to write to memory.  */
  return 0;
}

int
bar (int a)
{
  return g; /* A const function is not supposed to read memory.  */
}

-- 
           Summary: Warnings for pure and const functions that are not
                    actually pure or const
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kazu at cs dot umass dot edu
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18487