[Bug testsuite/30414] Random failure in gdb.fortran/lbound-ubound.exp

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

https://sourceware.org/bugzilla/show_bug.cgi?id=30414

--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Simon Marchi from comment #3)
> Hmm it could be.  The gdb_test_multiple reads from both the GDB output and
> the inferior's output, so it is possible that there is a race here, that we
> read GDB's prompt before we read the UBOUND line.

AFAIU, comment 0 shows the race happening:
...
(gdb) continue
Continuing.

Breakpoint 2, do_test (lb=..., ub=...) at
/home/jenkins/workspace/binutils-gdb_master_linuxbuild/platform/jammy-amd64/target_board/nati
ve-gdbserver/src/binutils-gdb/gdb/testsuite/gdb.fortran/lbound-ubound.F90:45
45        print *, ""   ! Test Breakpoint
(gdb) Remote debugging from host ::1, port 37496

 Expected GDB Output:

LBOUND = (-8, -10)
UBOUND = (-1, -2)
APB: Run a test here
APB: Expected lbound '(-8, -10)'
APB: Expected ubound ''
...

My understanding is that we see the order in which expect reads things, and in
this snippet the prompt comes before the UBOUND line.

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