[Bug c++/25955] FAIL: gdb.mi/mi-catch-cpp-exceptions.exp: all with invalid regexp: run until breakpoint in main (unknown output after running)

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

https://sourceware.org/bugzilla/show_bug.cgi?id=25955

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |tromey at sourceware dot org

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Bisects to:

commit 596dc4adfff347b4d8dc1f7e4eb57b8f2f342281 (HEAD, refs/bisect/bad)
Author: Tom Tromey <tom@tromey.com>
Date:   Fri May 8 14:14:05 2020 -0600

    Speed up psymbol reading by removing a copy

    I noticed that cp_canonicalize_string and friends copy a
    unique_xmalloc_ptr to a std::string.  However, this copy isn't
    genuinely needed anywhere, and it serves to slow down DWARF psymbol
    reading.

    This patch removes the copy and updates the callers to adapt.

    This speeds up the reader from 1.906 seconds (mean of 10 runs, of gdb
    on a copy of itself) to 1.888 seconds (mean of 10 runs, on the same
    copy as the first trial).

    gdb/ChangeLog
    2020-05-08  Tom Tromey  <tom@tromey.com>

            * symtab.h (class demangle_result_storage) <set_malloc_ptr>: New
            overload.
            <swap_string, m_string>: Remove.
            * symtab.c (demangle_for_lookup, completion_list_add_symbol):
            Update.

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