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Subject: Re: [boost] [Wiki] Changes in information about gcc warnings.
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2011-01-18 16:10:50

Patrick Horgan wrote:
> On 01/18/2011 06:08 AM, Stewart, Robert wrote:
> > -pedantic is a pain if you use, for example, #ident. So
> > far as I know, there's no way to reduce the resulting noise.
> That's true. Unfortunately there's no individual -W option for
> complaining about #ident, so you can't turn off the warning.

I wouldn't mind so much if the checks in -pedantic could be selected individually.

> If you're using #ident, which is a gcc extension, then you're
> clearly making a choice to use that compiler and that
> extension.

Not quite. Other compilers support #ident, though it isn't standard. MSVC used to support an option with similar functionality, but no more. Now we just use:

   #ifndef _MSC_VER
   # ident "$Id:$"

> In that case I wouldn't use -pedantic. Even something like
> using -std=gnu++0x won't get rid of it. It's a perfectly
> valid choice, but conflicts with a goal to be portable across
> many compilers.

That goal can be supported using conditional compilation, too. However, my point was that -pedantic may be something one uses occasionally to keep unwanted things at bay but may be too troublesome to be used all of the time. YMMV

> Do you know what the default is for the version of gcc you're
> using (currently c++98)?

We're using the default, sadly, but that will change in the not too distant future.

> As an example, there's a lot of usage of long long in boost,
> which is not in c++98 and will give warnings in the absence of
> -std=c++0x.

We use -Wno-long-long to enable the use of long long.

As Paul noted, such details should be included in the Wiki so they won't be a surprise.

Rob Stewart robert.stewart_at_[hidden]
Software Engineer, Core Software using std::disclaimer;
Susquehanna International Group, LLP

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