How to pass the obfuscated program's trace protocol through compiler-optimizer? - gdb

Question

With help of GDB-script:
file ./program
b *0x12345
run
while 1
x/i $pc
ni
end
quit
I got a trace protocol of obfuscated program:
...
0x484e0: bx lr
?? ()
0x43d88: b 0x43db8
?? ()
0x43db8: ldr r3, [r11, #-16]
?? ()
0x43dbc: mov r0, r3
?? ()
0x43dc0: sub sp, r11, #12
?? ()
0x43dc4: pop {r4, r5, r11, pc}
?? ()
0x3fb94: ldr r3, [r11, #-8]
?? ()
0x3fb98: mov r0, r3
?? ()
0x3fb9c: sub sp, r11, #4
?? ()
0x3fba0: pop {r11, pc}
?? ()
0x3da68: ldr r3, [r11, #-8]
...
Kris Kaspersky writes, that it is good idea to pass the tracer's protocol through compiler-optimizer for better understanding of this program. But I haven't any idea what compilers and in what way should I use.
P.S. What should I do to get rid of unnecessary lines: "?? ()" ? And what should I do to redirect GDB's out to file?
Edited:
Book: Kris Kaspersky "Искусство дизассемблирования", book in Russian (translation - "Art of disassembling"). Chapter №39, Page 822 (under the listing). I haven't any idea is English analogue exist.

Answer 1

Kris Kaspersky writes, that it is good idea to pass the tracer's protocol through compiler-optimizer for better understanding of this program. But I haven't any idea what compilers and in what way should I use.
I know what compilers are, but still have no idea what you are talking about. If you provide a link to the document you are reading, you might get better answers.
What should I do to get rid of unnecessary lines: "?? ()" ?
Use grep to filter them out, e.g.
grep -v '\?' trace.txt > clean-trace.txt
or
grep '^0x' trace.txt > clean-trace.txt
And what should I do to redirect GDB's out to file?
(gdb) set logging on # output will now be copied to gdb.txt