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Re: _GLIBCXX_CONCEPT_CHECKS usage
From: |
Pedro Lamarão |
Subject: |
Re: _GLIBCXX_CONCEPT_CHECKS usage |
Date: |
Fri, 14 Sep 2007 02:21:34 -0000 |
User-agent: |
G2/1.0 |
On 13 set, 10:03, mathieu <mathieu.malate...@gmail.com> wrote:
> On Sep 10, 9:42 pm, Pedro Lamarão <pedro.lama...@gmail.com> wrote:
>
>
>
> > On Sep 7, 12:50 pm, mathieu <mathieu.malate...@gmail.com> wrote:
>
> > > $ g++ -D_GLIBCXX_CONCEPT_CHECKS l.cxx 2>&1|
> > > wc
> > > 57 565 13383
> > > $ g++ l.cxx 2>&1|
> > > wc
> > > 18 156 2784
>
> > > Concept checking is making my output even worse... or am I missing
> > > something here ?
>
> > Well... I don't think turning "concept checking" on should be adding
> > any code -- but you are also not turning optimizations on.
>
> > Try adding -O2 and checking the size again.
>
> $ g++ -O2 -D_GLIBCXX_CONCEPT_CHECKS l.cxx 2>&1| wc
> 57 565 13383
> $ g++ -O2 l.cxx 2>&1| wc
> 18 156 2784
>
> Output seems to contains the exact same number of bytes.
>
> I don't understand what O2 was supposed to do here. I am only trying
> to get human readable output from what I believe is implemented in gcc
> now: concept checking.
Oh, I read you all wrong. I totally misread that pipe to wc.
-O2 won't really matter in this case.
Paste the complete error messages together with the contents of that
translation unit.
It really seems something unexpected is going on.
--
Pedro Lamarão