Re: Should --enable-debug set CFLAGS to -O0 instead of -O2?

My bad. You are right, the last -O will work. Then I think I get a solution
to my original problem. Thanks again for your help.

Chao Li (Evan)
------------------------------
HighGo Software Inc.
https://www.highgo.com/

Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> 于2025年8月1日周五 12:07写道：

> Chao Li <li(dot)evan(dot)chao(at)gmail(dot)com> writes:
> > Thanks for the explanation. W.R.T the PROFILE variable, I tried:
>
> > # ./configure --enable-debug
> > # PROFILE="-O0" make
>
> > As a result, both "-O2" and "-O0" presented to gcc. In that case, I
> believe
> > "-O0" will be ignored by gcc.
>
> Nope ... read the gcc docs, or experiment. The last -O switch wins.
> (This is true for most switches in most Unix tools, and it's common
> for scripts such as Makefiles to rely on it.)
>
> regards, tom lane
>