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List:       boost
Subject:    Re: [boost] Showstopper for Boost 1.56?
From:       "Niall Douglas" <s_sourceforge () nedprod ! com>
Date:       2014-07-31 22:08:18
Message-ID: 53DABE52.1321.54AE073 () s_sourceforge ! nedprod ! com
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On 31 Jul 2014 at 13:00, Peter Dimov wrote:

> > The following libraries use -pedantic and therefore generate warning spew 
> > on clang with Preprocessor:
> >
> > Chrono
> > Thread
> > Test
> 
> ...
> > An alternative is to remove -pedantic on clang.
> 
> Or, whoever adds -pedantic to the command line also needs to 
> add -Wno-c99-extensions and -Wno-variadic-macros. 

Ok, so solutions to stopping tens of megabytes of compiler warnings 
spew for a build of Boost 1.56 on clang are as follows:

1. Boost Build adds -Wno-c99-extensions and -Wno-variadic-macros to 
all clang builds.

2. All those libraries using -pedantic with Preprocessor (at least 
Chrono, Thread and Test) wrap their use of Preprocessor with #pragmas 
disabling the warnings.

3. All those libraries using -pedantic with Preprocessor (at least 
Chrono, Thread and Test) add  -Wno-c99-extensions and 
-Wno-variadic-macros to all clang builds.

I have admin privs over Boost.Thread and Vicente's about to go on 
holiday, so I can solve at least one of these libraries for cases 2 
or 3.

We need consensus on the best approach to take however. Option 1 is 
easiest, option 2 next easiest and option 3 could be tricky.

Some may, of course, wonder why any of those three libraries needs 
Preprocessor in std=c++-11 mode anyway? Perhaps some legacy parts not 
yet updated to variadics?

Niall

-- 
ned Productions Limited Consulting
http://www.nedproductions.biz/ 
http://ie.linkedin.com/in/nialldouglas/



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