[Bug gdb/31849] Issue with Unexpected Behavior in GDB Stepping at Optimization Level O2 and O3

["iamanonymous.cs at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31849

--- Comment #2 from Anonymous <iamanonymous.cs at gmail dot com> ---
(In reply to Anonymous from comment #1)
> Additionally, this unexpected stepping behavior does not occur when the
> program is compiled with optimization level O0.

We found this issue by comparing the executable files compiled with
optimization level O2, when comparing the debugging traces at the source level
and the instruction level.

We know that since optimization will optimize a large amount of code, the hit
information (i.e., the lines of code that the debugger stops at) of executable
files generated with different optimization levels under GDB cannot be directly
compared.

Here, "this unexpected stepping behavior does not occur" indicates that, at the
O0 level, neither the source-level debugging nor the instruction-level
debugging encountered the unexpected stopping at line #17.

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