Igor Sysoev wrote:

> As I understand gcc uses the lastest -O option, therefore -O -O2 is the same
> as -O2.

As far as I know in several Linux systems it is.
But nginx should not rely on that to cope with a less than optimal
./configure that is generating too much flags. I wonder, is it doing the
same with other flags?

> Also you may disable optimizations using -O -O0. As to -O2 itself,
> I believe you would not see any significant changes in nginx with -O2
> if compared with just -O. However, -O0 vs -O change is dramatically.

Thank you Igor and keep up with the good work.

M.