Re: Patch - Debug builds without optimization

Florian Pflug <fgp(at)phlo(dot)org> writes:
> On Jun16, 2011, at 14:30 , Radosaw Smogura wrote:
>> I'm sending following patch which disables optimization when --enable-debug is passed. It was nasty (for me, at least) that debug build required passing of CFLAGS with -O0 to get nice traceable code.

> Unfortunately, with some compilers (gcc, I'm looking at you) you get
> considerably fewer warnings with -O0 than with -O1, even if you specify
> -Wall.

Yes. There is *zero* chance of this being accepted, because it would
break a lot of warnings that developers need to see.

> I usually use -O1 for debug builds, these are usually still at least
> somewhat debuggable with gdb.

I tend to do that too, but I still think that folding it into
--enable-debug would be a mistake. The normal assumption (at least when
using gcc) is that --enable-debug doesn't cost any performance. We
would annoy many people, especially packagers, if that stopped being
true.

I could see providing some other nonstandard configure switch that
changed the default -O level ... but realistically, would that do
anything that you couldn't already do by setting CFLAGS, ie

./configure CFLAGS="-O0 -g"

regards, tom lane