[llvm-bugs] [Bug 45520] New: 'nodiscard' can be applied to function pointers

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45520

            Bug ID: 45520
           Summary: 'nodiscard' can be applied to function pointers
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tiagomacarios at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

clang, gcc, and cl disagree on the diagnostics for the code below:

https://godbolt.org/z/-zaSRh

[[nodiscard]] bool (*f)();

void _(){
  f();
}


clang:
<source>:4:3: warning: ignoring return value of function declared with
'nodiscard' attribute [-Wunused-result]

  f();

  ^

1 warning generated.

Compiler returned: 0

gcc:
<source>:1:25: warning: 'nodiscard' attribute can only be applied to functions
or to class or enumeration types [-Wattributes]

    1 | [[nodiscard]] bool (*f)();

      |                         ^

Compiler returned: 0

cl:
example.cpp

Compiler returned: 0



Looking at the standard I would think that gcc's behavior is correct?
http://eel.is/c++draft/dcl.attr.nodiscard#1.sentence-1
"The attribute-token nodiscard may be applied to the declarator-id in a
function declaration or to the declaration of a class or enumeration."

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