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debug-info/limited-debuginfo.rs fails with gdb 7.7 #12790

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@thestinger

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@thestinger
    error: line not found in debugger output: static void limited-debuginfo::main();
    command: gdb -quiet -batch -nx -command=x86_64-unknown-linux-gnu/test/debug-info/limited-debuginfo.debugger.script x86_64-unknown-linux-gnu/test/debug-info/limited-debuginfo.stage2-x86_64-unknown-linux-gnu
    stdout:
    ------------------------------------------
    All defined functions:

    File src/test/debug-info/limited-debuginfo.rs:
    static void limited-debuginfo::main(void);
    static void limited-debuginfo::some_function(void);
    static void limited-debuginfo::some_other_function(void);
    static void limited-debuginfo::zzz(void);

    Non-debugging symbols:
    0x00000000004007a8  _init
    0x00000000004007e0  __libc_start_main@plt
    0x00000000004007f0  __gmon_start__@plt
    0x0000000000400800  rust_stack_exhausted@plt
    0x0000000000400810  uvio::new_loop::hdae0a67fcace6484GIa::v0.10.pre@plt
    0x0000000000400820  lang_start::h54698a3875703cddBwc::v0.10.pre@plt
    0x0000000000400830  _start
    0x0000000000400860  deregister_tm_clones
    0x0000000000400890  register_tm_clones
    0x00000000004008d0  __do_global_dtors_aux
    0x00000000004008f0  frame_dummy
    0x0000000000400aa0  __libc_csu_init
    0x0000000000400b10  __libc_csu_fini
    0x0000000000400b14  __morestack
    0x0000000000400b24  _fini
    Breakpoint 1 at 0x400a30: file src/test/debug-info/limited-debuginfo.rs, line 44.
    static void limited-debuginfo::zzz(void);
    [Thread debugging using libthread_db enabled]
    Using host libthread_db library "/usr/lib/libthread_db.so.1".
    [New Thread 0x7ffff7f71700 (LWP 32165)]
    [New Thread 0x7ffff6268700 (LWP 32166)]
    [New Thread 0x7ffff6167700 (LWP 32167)]
    [New Thread 0x7ffff6066700 (LWP 32168)]
    [Switching to Thread 0x7ffff7f71700 (LWP 32165)]

    Breakpoint 1, limited-debuginfo::zzz () at src/test/debug-info/limited-debuginfo.rs:44
    44  fn zzz() {()}
    0x0000000000400a21 in limited-debuginfo::some_function () at src/test/debug-info/limited-debuginfo.rs:49
    49      zzz();
    No locals.
    [Thread 0x7ffff6268700 (LWP 32166) exited]
    [Thread 0x7ffff7f71700 (LWP 32165) exited]
    [Thread 0x7ffff6167700 (LWP 32167) exited]
    [Thread 0x7ffff7fd3740 (LWP 32152) exited]
    [Inferior 1 (process 32152) exited normally]

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    A-debuginfoArea: Debugging information in compiled programs (DWARF, PDB, etc.)

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