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: Nathan Ridge (zeratul976_at_[hidden])
Date: 2013-07-03 05:09:24

> 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

I stand corrected. (What's new in 4.8 is it being included in -Wall,
which is why I never noticed it in 4.7).

> 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.

I've seen spews of that warning for other large projects, such as
clang or wxWidgets, not just boost.

Would GCC consider removing it from -Wall?

>> CC'ing the gcc folks.
>
> That's not very helpful because posting to the Boost list is
> subscription only (you'll have two copies of this mail, because the
> first one I sent from an address subscribed to the GCC list but not
> this one.)

My apologies.

Regards,
Nate