[Bug testsuite/31573] [gdb/testsuite] FAIL: gdb.base/ctf-ptype.exp: ptype linked list structure

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31573

--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
Hmm, actually, that seems to be right.

Looking in the object, we have both ctf and dwarf info, with dwarf info:
...
$ readelf -wi outputs/gdb.base/ctf-ptype/ctf-ptype0.o 
Contents of the .debug_info section:

  Compilation Unit @ offset 0:
   Length:        0x36 (32-bit)
   Version:       4
   Abbrev Offset: 0
   Pointer Size:  8
 <0><b>: Abbrev Number: 1 (DW_TAG_compile_unit)
    <c>   DW_AT_stmt_list   : 0
    <10>   DW_AT_low_pc      : 0
    <18>   DW_AT_high_pc     : 563
    <1a>   DW_AT_name        : (indirect string, offset: 0): /tmp/ccGk1NDi.s
    <1e>   DW_AT_comp_dir    : (indirect string, offset: 0x10):
/data/vries/gdb/leap-15-4/build/gdb/testsuite
    <22>   DW_AT_producer    : (indirect string, offset: 0x3e): GNU AS 2.41.0
    <26>   DW_AT_language    : 32769    (MIPS assembler)
 <1><28>: Abbrev Number: 2 (DW_TAG_subprogram)
    <29>   DW_AT_name        : (indirect string, offset: 0x4c): main
    <2d>   DW_AT_external    : 1
    <2d>   DW_AT_type        : <0x38>
    <2e>   DW_AT_low_pc      : 0
    <36>   DW_AT_high_pc     : 563
 <1><38>: Abbrev Number: 3 (DW_TAG_unspecified_type)
 <1><39>: Abbrev Number: 0
...

So, why is gas generating dwarf info for main when we're using -gctf?

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