`DCL51-CPP`: `_FUN` incorrectly flagged

[lcartey]

Affected rules

• DCL51-CPP

Description

gcc generates a _FUN static member function when handling lambdas that are converted to function pointers:

https://github.com/gcc-mirror/gcc/blob/7b206ae7f17455b69349767ec48b074db260a2a7/gcc/cp/lambda.cc#L1138-L1142

This function is incorrectly flagged as a "user written" function with a compiler reserved prefix.

We should update the query to exclude Functions and Variables which are compiler generated.

Example

void g(int (*l)(int)) {}

void test_lambda(const int y) {
  // Lambda generates a static function called `_FUN` when the lambda is
  // converted to a function pointer
  g([](int x) { return x; }); // COMPLIANT[FALSE_POSITIVE] - compiler generated
}