[cfe-commits] [Patch] Print differences for function pointers.

[Richard Trieu]

New feature that will print additional information when non-matching
function pointers are used.  This will help users more easily distinguish
why the function pointers do not match.  The points of difference that will
be noted are:

Different number of parameters
Different parameter type
Different return type
Different function qualifiers

For instance, code like this:

double foo(int x) {return 0;};
double (*bar)(int, int) = &foo;

Will get this error message:

function-mismatch.cc:2:10: error: cannot initialize a variable of
      type 'double (*)(int, int)' with an rvalue of type 'double (*)(int)'
      because of different number of parameters (expected 2 but has 1)
double (*bar)(int, int) = &foo;
         ^                ~~~~

Patch is attached and also available at
http://codereview.appspot.com/5369119/
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