HepMC.cmake
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	# Copyright 2016 L. Pickering, P Stowell, R. Terri, C. Wilkinson, C. Wret

	################################################################################
	# This file is part of NUISANCE.
	#
	# NUISANCE is free software: you can redistribute it and/or modify
	# it under the terms of the GNU General Public License as published by
	# the Free Software Foundation, either version 3 of the License, or
	# (at your option) any later version.
	#
	# NUISANCE is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with NUISANCE. If not, see <http://www.gnu.org/licenses/>.
	################################################################################

	if(USE_HEPMC)

	LIST(APPEND EXTRA_CXX_FLAGS -D__HEPMC_ENABLED__)

	if(HEPMC STREQUAL "")
	if (NO_EXTERNAL_UPDATE)
	set_property(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
	PROPERTY EP_UPDATE_DISCONNECTED 1)
	cmessage(STATUS "Will not attempt to update third party HepMC tools for each build.")
	endif()

	ExternalProject_Add(HepMC
	PREFIX "${PROJECT_BINARY_DIR}/HepMC"
	GIT_REPOSITORY https://gitlab.cern.ch/hepmc/HepMC.git
	GIT_TAG HEPMC_02_06_09
	CMAKE_ARGS
	-DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}
	-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
	-DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
	-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
	-Dmomentum=${HEPMC_MOMUNIT}
	-Dlength=${HEPMC_LENUNIT})


	#Have to re-include the doc string here as the whole cache entry will be
	#overwritten when this happens
	set(HEPMC "${CMAKE_INSTALL_PREFIX}" CACHE PATH
	"Path to HEPMC source tree root directory. Overrides environment variable \$HEPMC <>"
	FORCE)

	set(HEPMC_USED_EP TRUE CACHE INTERNAL "Whether the we built HepMC or not. <FALSE>"
	FORCE)

	cmessage(STATUS "Building HepMC")
	endif()

	LIST(APPEND EXTRA_CXX_FLAGS
	-I${HEPMC}/include/)

	LIST(APPEND EXTRA_LINK_DIRS ${HEPMC}/lib/)
	LIST(APPEND EXTRA_LIBS HepMC HepMCfio)
	endif()

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