[Bug c/106818] New: code is genereated differently with or without 'extern'

[pangbw at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106818

            Bug ID: 106818
           Summary: code is genereated differently with or without
                    'extern'
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pangbw at gmail dot com
  Target Milestone: ---

Just wondering why GCC would generate such different code:

https://godbolt.org/z/ncE5sWYe8