What is LAMMPS_EXCEPTIONS cmake flag?

LAMMPS LAMMPS Development
1

what is -DLAMMPS_EXCEPTIONS=yes ?

this is the instructions for installing FitSNAP:

cd /path/to/lammps
mkdir build-fitsnap
cd build-fitsnap
# Use cmake to build the Makefile
cmake ../cmake -DLAMMPS_EXCEPTIONS=yes \
              -DBUILD_SHARED_LIBS=yes \
              -DMLIAP_ENABLE_PYTHON=yes \
              -DPKG_PYTHON=yes \
              -DPKG_ML-SNAP=yes \
              -DPKG_ML-IAP=yes \
              -DPKG_ML-PACE=yes \
              -DPKG_SPIN=yes \
              -DPYTHON_EXECUTABLE:FILEPATH=`which python`
# Build a LAMMPS executable and shared library
make
# Install Python-LAMMPS interface
make install-python

but i cant find any mentions of this cmake flag in https://docs.lammps.org/

is this flag obsolete ?

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