[Bug c/55422] gcc does not diagnose change of linkage for a function.

[cookevillain at yahoo dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55422

cookevillain at yahoo dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|4.4.3                       |5.4.0

--- Comment #6 from cookevillain at yahoo dot com ---
I still believe (although it has been almost six years since the original
report) that gcc's diagnostics are inconsistent in this case. Here is a
slightly different version of the input above:

static void ff(int a) {

  return;

}

int f(void) {

  {
    int ff = 0;

    {

      extern void ff(int);

    }

    return ff;
  }

  ff(0);
}

gcc is silent about this file in every mode (c89, c11, etc.) although the only
difference between this code and the other example above is that ff is declared
as a function. I understand that gcc does not have to produce a diagnostic for
every undefined behavior (such as ff having both external and internal linkage
as above) but since it already diagnoses it for ordinary variables, why not
functions?