also compare "except" declaration when comparing C function signatures

Cython/Compiler/PyrexTypes.py

@@ -2404,6 +2404,10 @@ class CFuncType(CType):
             return 0
         if not self.same_calling_convention_as(other_type):
             return 0
+        if self.exception_value != other_type.exception_value:
+            return 0
+        if self.exception_check != other_type.exception_check:
+            return 0
         return 1
 
     def compatible_signature_with(self, other_type, as_cmethod = 0):

tests/errors/pxd_signature_mismatch.pxd

+
+cdef int wrong_args(int x, long y)
+
+cdef long wrong_return_type(int x, int y)
+
+cdef int wrong_exception_check(int x, int y) except 0
+
+cdef int wrong_exception_value(int x, int y) except 0
+
+cdef int wrong_exception_value_check(int x, int y) except 0

tests/errors/pxd_signature_mismatch.pyx

+# mode: error
+# tag: pxd
+
+cdef int wrong_args(int x, int y):
+    return 0
+
+cdef int wrong_return_type(int x, int y):
+    return 0
+
+cdef int wrong_exception_check(int x, int y) except? 0:
+    return 0
+
+cdef int wrong_exception_value(int x, int y) except 1:
+    return 0
+
+cdef int wrong_exception_value_check(int x, int y) except? 1:
+    return 0
+
+
+_ERRORS = """
+4:5: Function signature does not match previous declaration
+7:5: Function signature does not match previous declaration
+10:5: Function signature does not match previous declaration
+13:5: Function signature does not match previous declaration
+16:5: Function signature does not match previous declaration
+"""