Build error on Ubuntu 16.10

[fbench]

Hi,

I am trying to build ROOT 5.34/36 on 64bit Ubuntu 16.10.
The build fails with the following error:

/home/fbench/root/tmva/src/RuleFitParams.cxx: In member function ‘void TMVA::RuleFitParams::CalcFStar()’:
/home/fbench/root/tmva/src/RuleFitParams.cxx:883:25: error: ‘isnan’ was not declared in this scope
if (isnan(fstarVal)) Log() << kFATAL << “F* is NAN!” << Endl;

Does anyone know why this problem is occurring and how I can get around it?

Possibly relevant information:
[ul]I am using gcc and g++ versions 4.9.4 (and have unsuccessfully tried using version 6 for both)

ROOT was configured using

./configure linuxx8664gcc --with-cc=gcc --with-cxx=g++ --with-ld=g++ --enable-http --enable-gdml --enable-cxx14 --enable-roofit --enable-mathmore --enable-minuit2 --disable-xft --disable-sqlite --enable-gsl-shared

[/ul]

Thank you for your help,
Francis

[mato]

Hi Francis. Thanks for reporting the problem. I have committed a fix to the 5.34 branch. See github.com/root-mirror/root/com … 21e0c65493
Adding std:: in isnan fixes it.
Cheers,

Pere