[Bug gdb/22491] New: gdb.arch/amd64-stap-optional-prefix.exp fails after probe C++-ification patch

["sergiodj at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22491

            Bug ID: 22491
           Summary: gdb.arch/amd64-stap-optional-prefix.exp fails after
                    probe C++-ification patch
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: sergiodj at redhat dot com
          Reporter: sergiodj at redhat dot com
  Target Milestone: 8.1

Pedro has pointed out that a regression has been introduced by my C++-ification
patches touching the probe interfaces
(https://sourceware.org/ml/gdb-patches/2017-11/msg00525.html).

The problem happens on gdb.arch/amd64-stap-optional-prefix.exp:

 77 break -pstap bar
 78 Breakpoint 3 at 0x40048d
 79 (gdb) PASS: gdb.arch/amd64-stap-optional-prefix.exp: bar: break -pstap bar
 80 continue
 81 Continuing.
 82 
 83 Program received signal SIGILL, Illegal instruction.
 84 main () at amd64-stap-optional-prefix.S:26
 85 26              STAP_PROBE1(probe, foo, (%rsp))

It is still not clear why, but I am investigating.  I am marking this bug's
Target milestone to 8.1, because it is a regression that shouldn't be present
in the next branch.

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