FindEigen3Unsupported.cmake
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FindEigen3Unsupported.cmake
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			# check for GMRES solver
			#
			# Eigen3 unsuported
			# GMRES.h is really the file we are using/looking for
			# If it doesn't exist then the solver will not be included in the list of the parse solvers
			if(NOT EIGEN3_UNSUPPORTED_FOUND)
			# first check that eigen was found
			if(NOT EIGEN3_FOUND)
			set(EIGEN3_UNSUPPORTED_FOUND OFF CACHE BOOL "Eigen/unsupported exists")
			else()
			# then check for the files we are looking for
			set( EIGEN3_GMRES_PATH "${EIGEN3_INCLUDE_DIR}/unsupported/Eigen/src/IterativeSolvers/GMRES.h")
			set( EIGEN3_SPARSE_EXTRA "${EIGEN3_INCLUDE_DIR}/unsupported/Eigen/SparseExtra")
			if( EXISTS ${EIGEN3_GMRES_PATH} AND EXISTS ${EIGEN3_SPARSE_EXTRA})

			# if found register variables
			set(EIGEN3_UNSUPPORTED_FOUND ON CACHE BOOL "Eigen/Unsupported exists" FORCE)
			set(EIGEN3_UNSUPPORTED_INCLUDE_DIR "${EIGEN3_INCLUDE_DIR}/unsupported/"
			CACHE PATH "Include dir for eigen unsupported modules" FORCE)
			mark_as_advanced(
			EIGEN3_UNSUPPORTED_FOUND
			EIGEN3_UNSUPPORTED_INCLUDE_DIR
			)
			message(STATUS "Eigen3/unsupported found.")
			else()
			set(EIGEN3_UNSUPPORTED_FOUND OFF CACHE BOOL "Eigen/Unsupported exists")
			message(STATUS "Eigen3/unsupported not found.")
			endif()
			endif(NOT EIGEN3_FOUND)
			endif(NOT EIGEN3_UNSUPPORTED_FOUND)