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## ---------------------------------------------------------------------
##
## Copyright (C) 2012 - 2015 by the deal.II authors
##
## This file is part of the deal.II library.
##
## The deal.II library is free software; you can use it, redistribute
## it, and/or modify it under the terms of the GNU Lesser General
## Public License as published by the Free Software Foundation; either
## version 2.1 of the License, or (at your option) any later version.
## The full text of the license can be found in the file LICENSE at
## the top level of the deal.II distribution.
##
## ---------------------------------------------------------------------
#
# Try to find the ARPACK library
#
# This module exports
#
# ARPACK_LIBRARIES
# ARPACK_LINKER_FLAGS
# ARPACK_WITH_PARPACK
#
SET(ARPACK_DIR "" CACHE PATH "An optional hint to an ARPACK installation")
SET_IF_EMPTY(ARPACK_DIR "$ENV{ARPACK_DIR}")
DEAL_II_FIND_LIBRARY(ARPACK_LIBRARY
NAMES arpack
HINTS ${ARPACK_DIR}
PATH_SUFFIXES lib${LIB_SUFFIX} lib64 lib
)
IF(DEAL_II_WITH_MPI)
#
# Sanity check: Only search the parpack library in the same directory as
# the arpack library...
#
GET_FILENAME_COMPONENT(_path "${ARPACK_LIBRARY}" PATH)
DEAL_II_FIND_LIBRARY(PARPACK_LIBRARY
NAMES parpack
HINTS ${_path}
NO_DEFAULT_PATH
NO_CMAKE_ENVIRONMENT_PATH
NO_CMAKE_PATH
NO_SYSTEM_ENVIRONMENT_PATH
NO_CMAKE_SYSTEM_PATH
NO_CMAKE_FIND_ROOT_PATH
)
ELSE()
SET(PARPACK_LIBRARY "PARPACK_LIBRARY-NOTFOUND")
ENDIF()
IF(NOT DEAL_II_ARPACK_WITH_PARPACK)
#
# We have to avoid an unfortunate symbol clash with "libscalapack.so" -
# arpack happened to blindly copy a symbol name...
# https://github.com/opencollab/arpack-ng/issues/18
# https://github.com/opencollab/arpack-ng/pull/21
#
# Just disable parpack support if scalapack is present in Trilinos' or
# PETSc's link interface. This can be overridden by manually setting
# DEAL_II_ARPACK_WITH_PARPACK to true.
#
FOREACH(_libraries ${TRILINOS_LIBRARIES} ${PETSC_LIBRARIES})
IF("${_libraries}" MATCHES "scalapack")
SET(PARPACK_LIBRARY "PARPACK_LIBRARY-NOTFOUND")
ENDIF()
ENDFOREACH()
ENDIF()
IF(NOT PARPACK_LIBRARY MATCHES "-NOTFOUND")
SET(ARPACK_WITH_PARPACK TRUE)
ELSE()
SET(ARPACK_WITH_PARPACK FALSE)
ENDIF()
DEAL_II_PACKAGE_HANDLE(ARPACK
LIBRARIES
OPTIONAL PARPACK_LIBRARY
REQUIRED ARPACK_LIBRARY LAPACK_LIBRARIES
OPTIONAL MPI_C_LIBRARIES
LINKER_FLAGS OPTIONAL LAPACK_LINKER_FLAGS
CLEAR ARPACK_LIBRARY PARPACK_LIBRARY
)
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