[Bug c/88720] New: Strange error message about nested function declared but not defined when using inline.

[anders.granlund.0 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88720

            Bug ID: 88720
           Summary: Strange error message about nested function declared
                    but not defined when using inline.
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: anders.granlund.0 at gmail dot com
  Target Milestone: ---

Test case (prog.c):

  static void f();

  int main()
  {
    inline void f();
  }

Compilation command line:

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

Observed behaviour:

  The following error message was outputed:

    error: nested function 'f' declared but never defined

Expected behaviour:

  No error message outputed.

Note:

  Clang accepts the program without any error message outputed.