[Bug c++/19068] gdb cannot handle operator= if both const access (as rhs) and non-const (lhs) methods defined

["richard_sharman at mitel dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19068

--- Comment #2 from Richard Sharman <richard_sharman at mitel dot com> ---
If a class is defined with a single operator[] method,
then gdb can invoke this method with the normal x[i] syntax.

If, however,  there are separate const "rhs" and non-const "lhs" 
methods defined,  then trying to print or assign using x[i] syntax
produces the message "Could not find operator[].".

See example t.c.  When compiled as is (SEPARATE_SUB_METHODS defined)
there are methods 
        const T& operator[](const int index) const 
and
        T& operator[](const int index) {

Running gdb shows:

(gdb) b 53
Breakpoint 1 at 0x40076a: file t.cc, line 53.
(gdb) r
(gdb) p x
$1 = {storage = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100}}
(gdb) p x[3]
Could not find operator[].
(gdb) show version
GNU gdb (GDB) 7.10
Copyright (C) 2015 Free Software Foundation, Inc.


When SEPARATE_SUB_METHODS is undefined there is only one method
        T& operator[](const int index)  {
and gdb works fine with this:

(gdb) b 53
Breakpoint 1 at 0x40076a: file t2.cc, line 53.
(gdb) r
Starting program: /localhome/sharman/tmp/c++test/t2 

Breakpoint 1, main (NameError: Installation error: gdb.execute_unwinders
function is missing

argc=1, argv=0x7fffffffdbc8) at t2.cc:53
53              printf("%2d: %d\n", i, x[i]);
(gdb) p x
$1 = {storage = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100}}
(gdb) p x[3]
NameError: Installation error: gdb.execute_unwinders function is missing
$2 = (int &) @0x7fffffffdab8: 30
(gdb) set var x[3] = 33
(gdb) p x[3]
$3 = (int &) @0x7fffffffdab8: 33
(gdb) p x
$4 = {storage = {10, 20, 33, 40, 50, 60, 70, 80, 90, 100}}
(gdb)

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