[Bug testsuite/31234] New: [gdb/testsuite, s390x] FAIL: gdb.fortran/mixed-lang-stack.exp: lang=auto: print obj

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

https://sourceware.org/bugzilla/show_bug.cgi?id=31234

            Bug ID: 31234
           Summary: [gdb/testsuite, s390x] FAIL:
                    gdb.fortran/mixed-lang-stack.exp: lang=auto: print obj
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

On s390x-linux, I ran into:
...
(gdb) PASS: gdb.fortran/mixed-lang-stack.exp: lang=auto: info frame in frame #2
print obj^M
value has been optimized out^M
(gdb) FAIL: gdb.fortran/mixed-lang-stack.exp: lang=auto: print obj
...

This is a regression since gdb 13, but it's due to a test-case patch:
...
commit a60ead5ded5f9fc548018637d4810cb5f313ad8c
Author: Nils-Christian Kempke <nils-christian.kempke@intel.com>
Date:   Tue May 31 16:43:45 2022 +0200

    gdb, testsuite, fortran: fix double free in mixed-lang-stack.exp
...

After reverting the patch, the FAIL disappears.

The difference is in the debug info.  In the passing case we have:
...
 <2><ce1>: Abbrev Number: 45 (DW_TAG_formal_parameter)
    <ce2>   DW_AT_name        : obj
    <ce6>   DW_AT_decl_file   : 1
    <ce7>   DW_AT_decl_line   : 75
    <ce8>   DW_AT_type        : <0xbd3>
    <cec>   DW_AT_location    : 4 byte block: 91 d8 7e 6        (DW_OP_fbreg:
-168; DW_OP_deref)
...
and in the failing case:
...
 <2><c3f>: Abbrev Number: 40 (DW_TAG_formal_parameter)
    <c40>   DW_AT_name        : obj
    <c44>   DW_AT_decl_file   : 1
    <c45>   DW_AT_decl_line   : 65
    <c46>   DW_AT_type        : <0xba2>
    <c4a>   DW_AT_location    : 2 byte block: 72 0      (DW_OP_breg2 (r2): 0)
...

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