[llvm-bugs] [Bug 47018] New: Feature request: warn about unnecessary comparison to nullptr

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47018

            Bug ID: 47018
           Summary: Feature request: warn about unnecessary comparison to
                    nullptr
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: federico.kircheis at gmail.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Clang warns in some contexts about unnecessary comparisons to nullptr, like

----
int main(){
 int i = 42;
 &i != nullptr;
}
----

but it does not when comparing function references:

----
void foo(){}

int main(){
    void(&f)() = foo;
    return f != nullptr;
}
----

(compiled with "-Weverything -Wno-c++98-compat -Wno-missing-prototypes
-Wno-c++98-compat-pedantic")

https://godbolt.org/z/nEbcbM

For reference, GCC does emit a warning through the switch "-Waddress".

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