Re: [boost] lots of warning with gcc-4.8.1 + boost-1.54.0

Subject: Re: [boost] lots of warning with gcc-4.8.1 + boost-1.54.0
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2013-07-04 02:31:56

On 03/07/13 10:32, Jonathan Wakely wrote:
> On 3 July 2013 02:41, Nathan Ridge wrote:
>>> Lots of warnings like this:
>>>
>>> ./boost/bind/arg.hpp:37:22: warning: typedef ‘T_must_be_placeholder’ locally
>>> defined but not used [-Wunused-local-typedefs]
>>>
>>> when building 1.54.0 with gcc-4.8.1 (fedora f19)
>>
>> This warning is new in GCC 4.8, and I have been seeing a ton of them
>> not just in boost, but in every codebase I've built.
>
> It was new in GCC 4.7, http://gcc.gnu.org/gcc-4.7/changes.html
>
> It affects Boost more than most code because of the prevalent use of
> concept checks and static assertions which are usually implemented
> using typedefs but only conditionally compiled.

Unused local typedefs is a real bug.
It's Boost that needs fixing IMHO.

If it's for a static assert trick, just write your trick differently to 
not require it or just use one of the provided macros that do it right.