[Bug c/11377] New: fault or warn modifiable static in extern inline definition

["algrant at myrealbox dot com" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11377

           Summary: fault or warn modifiable static in extern inline
                    definition
           Product: gcc
           Version: 3.3
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: algrant at myrealbox dot com
                CC: gcc-bugs at gcc dot gnu dot org

C prohibits this (6.7.4#3):
  extern inline int f(void) { static int n; return ++n; }
Even with 'gnu89' extern-inline semantics, gcc does not treat this
predictably, as a given call site may use one of two possible
instances of 'n', so a warning to that effect would be useful.