Net beans optimized out

[powsem]

Hello every one!
I use Net Beans on Arch Linux. How I turn off optimization in g++, for view values of variables?
I'am trying:
1. "Project properties" > "C++ Compiler" > "Additional options" added -O0.
2. I use "volatile" before variable. For example volatile int length = strlen(str)

But it's, don't work ((

[Ganado]

What exactly doesn't work? Can you describe how you're building and running it?
What is the full compiler command produced?

If you need to view values of variables, I assume that means you're debugging.
Are you turning on debugging symbols?
https://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html
Try adding -g.

Also, does this article help?
https://netbeans.org/kb/docs/cnd/debugging.html

[powsem]

When I view variable value, I see "<optimized out>". I building and running as described https://netbeans.org/kb/docs/cnd/debugging.html. I click "Clean and building project" > "Debug project".
Screenshot https://ibb.co/mRCbxyB. I note, if place string int length = strlen(str); (as view the screenshot) in constructor, value of variable "<optimized out>", but place in main(), value viewed correct. I try adding -g, but not working.

[salem c]

Your screenshot has gone.

[powsem]

Hmmm... It's strange... May be you copy link with last dot? Alternative link https://pictr.com/image/0CHzSx

[Peter87]

It might be because you don't use length for anything.

[powsem]

Peter87, yes. You right, if I use variable below, then I see value. Can I view value without use variable?

[Peter87]

I don't know. What's the point of the variable if you're not using it?

[powsem]

I heave read: "if I see "<optimized out>", and don't use variable, then will adding option -O0 into compilation string". It's don't working. Thank's every body!