[llvm-bugs] [Bug 40169] New: c11: Accepts ill-formed program using an enum type before it is complete.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40169

            Bug ID: 40169
           Summary: c11: Accepts ill-formed program using an enum type
                    before it is complete.
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: anders.granlund.0 at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Test program (prog.c):

  int main()
  {
    enum E { x = sizeof (enum E *) };
  }

Compilation command line:

  clang prog.c -Wall -Wextra -std=c11 -pedantic-errors 

Observed behaviour:

  No error messages outputed.

Expected behaviour:

  An error message outputed.

  The use of the typespecifier  enum E  in  enum E *  is not allowed becuase
  the enum  E  is not yet complete at that point. 

References to the c17 (bugfix of c11) standard:

  6.7.2.3/3:

    "A type specifier of the form enum identifier without an enumerator list
     shall only appear after the type it specifies is complete."

  6.7.2.2/4:

     "... The enumerated type is incomplete until immediately after the }
      that terminates the list of enumerator declarations, and complete
      thereafter."

Note:

  GCC outputs the expected error message.

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