Re: [Boost-users] [array] GCC 4.2 warnings with array initialization

Subject: Re: [Boost-users] [array] GCC 4.2 warnings with array initialization
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-06-11 10:29:05

AMDG

Allen Cronce wrote:
> When building with boost 1.36 and GCC 4.2 under Xcode, the following 
> code produces a warning:
>
>     boost::array<int, 2> warningArray =
>     {
>         1, 2
>     };
>
>     warning: missing braces around initializer for 'int [2]'
>
> We see no warnings with GCG 4.0. We have a zero warning tolerance. All 
> warnings are counted as errors.
>
> The boost::array documentation indicates that the single brace 
> approach should work for conforming compilers, according to 8.5.1 (11) 
> of the Standard. So does that mean that GCC 4.2 is non-conforming?

A compiler is not non-conforming because it issues a warning for legal code.

> Sure enough, when I change the code to include a second set of braces, 
> the warning is gone:
>     
>     boost::array<int, 2> noWarningArray =
>     {
>         {
>             1, 2
>         }
>     };
>
> But this is a problem as we move to GCC 4.2 because a) we use 
> initialized arrays all over the place, so this means a lot of little 
> changes, and b) requiring an extra set of braces is counter intuitive 
> and irritating at best.
>
> I don't like the idea of making the above code changes, and I don't 
> want to globally disable the warning because it might be useful for 
> other code. Does anyone have a better solution?

There is no way to disable the warning only for boost::array, AFAIK.

In Christ,
Steven Watanabe