[Bug other/81458] New: Misdetection of gcc_cv_as_cfi_advance_working

["joerg at netbsd dot org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81458

            Bug ID: 81458
           Summary: Misdetection of gcc_cv_as_cfi_advance_working
           Product: gcc
           Version: 5.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
          Assignee: unassigned at gcc dot gnu.org
          Reporter: joerg at netbsd dot org
  Target Milestone: ---

Created attachment 41768
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41768&action=edit
Problematic object file

The gcc_cv_as_cfi_advance_working test case can misdetect support due to bugs
in objdump. Please consider switching to readelf instead. Attached is the
assembled test case from NetBSD.

readelf --debug-dump=frames gives:

    00000018 00000018 0000001c FDE cie=00000000 pc=00000000..00012520
      DW_CFA_advance_loc4: 75040 to 00012520
      DW_CFA_def_cfa_offset: 192
    ...

and objdump -Wf gives:

    00000018 0000000000000018 0000001c FDE cie=00000000
pc=0001252000000000..c00f252125200400
      Augmentation data:     00

      DW_CFA_nop
      DW_CFA_nop