[Bug c/84531] New: c/c++: bogus warning for functions with different argument lengths but compatible arguments

[siddhesh at gotplt dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84531

            Bug ID: 84531
           Summary: c/c++: bogus warning for functions with different
                    argument lengths but compatible arguments
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: siddhesh at gotplt dot org
  Target Milestone: ---

gcc trunk throws a bogus warning about incompatible function cast when the cast
target and the function have different argument lengths but the same arguments
for the common subset.  An example of this is the PyCFunction <->
PyCFunctionWithKeywords cast in python.

Patch posted along with test case:

https://gcc.gnu.org/ml/gcc-patches/2018-02/msg01315.html