[Rivet] Rivet build fails with gcc71

[David Grellscheid]

Hi Dmitri,

the c++11 flag is _not_ needed with gcc 7.1. Configure decides this
completely correctly.

However, the <functional> header now needs to be listed explicitly in
RivetSTL.h. The C++ library in 7.1 has removed several implicit
inclusions of <functional>, which is a known necessary fix, as you can
see from https://gcc.gnu.org/gcc-7/porting_to.html

The repository has this fixed already.

  David






On 05/05/2017 13:38, Dmitri Konstantinov wrote:
> Dear Rivet developers,
> 
> In CERN we have started to build LCG software stack with gcc 7.1 (I) and
> there is a problem with Rivet.
> 
> http://cdash.cern.ch/upload/1b4440604d07f796afec84d4ceb28e3c1db321e2/rivet-2.5.3-build.log
> 
> 
> Rivet configure ( m4/ax_cxx_compile_stdcxx.m4  macro)  doesn't set C++11
> flag thinking that gcc 7 supports C++11 by default (II) but
> 
> apparently not all features as it fails to compile.
> 
> Could you please take a look?
> 
> We see that it can be bypassed by passing c++11 with CXXFLAGS .
> 
> Cheers,
> 
>    Dima for the GENSER
> 
> 
> (I)  source /cvmfs/sft.cern.ch/lcg/contrib/gcc/7/x86_64-slc6/setup.sh
> 
> (II)
> https://rivet.hepforge.org/trac/browser/m4/ax_cxx_compile_stdcxx.m4#L62
> 
> 
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