Re: compile with gcc option -O0 or -O

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To: zou wonder <wonder.zou@xxxxxxxxx>
Subject: Re: compile with gcc option -O0 or -O
From: Jonathan Wakely <jwakely.gcc@xxxxxxxxx>
Date: Fri, 16 Sep 2011 10:47:19 +0100
Cc: gcc-help@xxxxxxxxxxx, david@xxxxxxxxxxxxxxx
In-reply-to: <CAOXjUBxayZQmPJgduja5z6hhny7+w9gt4t3tQLYif69bFXBHiQ@mail.gmail.com>
References: <CAOXjUBxzdU2z8sEwGyczjovxigcwUkWNf28szuaQVEDKa9S=Sg@mail.gmail.com> <mcrobyl6o4f.fsf@coign.corp.google.com> <CAOXjUBzK0snvjNcpi8D3mK5dmXwzH62XXETyjv+4f6S+LDmXyQ@mail.gmail.com> <CAOXjUBwW2ghmfsF1OA5DY7hZOz-43r22biSG60VyWaviFau_-Q@mail.gmail.com> <mcrfwjx6lrk.fsf@coign.corp.google.com> <CAOXjUBxayZQmPJgduja5z6hhny7+w9gt4t3tQLYif69bFXBHiQ@mail.gmail.com>

On 16 September 2011 10:12, zou wonder wrote:
> hi david:
> i have tried to enable all the warning option you provided :
> and here are some warnings:

As Miles said, many of the warning options David suggested are not
suitable for all code, you will get most of the benefit just using
-Wall -Wextra

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