Building ROOT

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In the pCT project we need to use a version of ROOT which is compiled with c++17 in order to build packages with ROOT dependencies with c++17 standard. .

ROOT implements a custom adaptor to std::string_view if not compiled with c++17 and this conflicts with the real one if a packages uses c++17 standard and ROOT libraries/includes.

<syntaxhighlight lang="bash"> sudo yum install git cmake gcc-c++ gcc binutils \ libX11-devel libXpm-devel libXft-devel libXext-devel \ gcc-gfortran openssl-devel pcre-devel \ mesa-libGL-devel mesa-libGLU-devel glew-devel ftgl-devel mysql-devel \ fftw-devel cfitsio-devel graphviz-devel \ avahi-compat-libdns_sd-devel libldap-dev python-devel \ libxml2-devel gsl-static gsl-devel \ libAfterImage libAfterImage-devel

sudo python3 -m pip install numpy

1. clone the repository

git clone http://github.com/root-project/root.git

1. choose a build directory

mkdir build_root; cd build_root

scl enable devtoolset-8 bash

1. configure: choose install target, on the lab machine we need to disable asimage for some reason
2. the important flag is the C++ standard

cmake3 -DCMAKE_INSTALL_PREFIX=/opt/root -DCMAKE_CXX_STANDARD=17 -DPYTHON_EXECUTABLE=/usr/bin/python3 ../

1. build and install

sudo cmake3 --build . --target install -- -j4

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