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# - Find the FFTW library
#
# Usage:
# FIND_PACKAGE(FFTW [REQUIRED] [QUIET] )
#
# It sets the following variables:
# FFTW_FOUND ... true if fftw is found on the system
# FFTW_LIBRARIES ... full path to fftw library
# FFTW_INCLUDES ... fftw include directory
#
# The following variables will be checked by the function
# FFTW_USE_STATIC_LIBS ... if true, only static libraries are found
# FFTW_ROOT ... if set, the libraries are exclusively searched
# under this path
# FFTW_LIBRARY ... fftw library to use
# FFTW_INCLUDE_DIR ... fftw include directory
#
#If environment variable FFTWDIR is specified, it has same effect as FFTW_ROOT
######## This FindFFTW.cmake file is a copy of the file from the eigen library
######## http://code.metager.de/source/xref/lib/eigen/cmake/FindFFTW.cmake
IF(NOT FFTW_ROOT AND ENV{FFTWDIR})
SET(FFTW_ROOT $ENV{FFTWDIR})
ENDIF()
IF (NOT INTEL_MKL_ROOT_DIR)
SET(INTEL_MKL_ROOT_DIR $ENV{INTEL_MKL_ROOT})
ENDIF()
IF(NOT FFTW_ROOT)
IF (ENV{FFTWDIR})
SET(FFTW_ROOT $ENV{FFTWDIR})
ENDIF()
IF (ENV{FFTW_ROOT_DIR})
SET(FFTW_ROOT $ENV{FFTW_ROOT_DIR})
ENDIF()
IF (INTEL_MKL_ROOT_DIR)
SET(FFTW_ROOT ${INTEL_MKL_ROOT_DIR})
ENDIF()
ENDIF()
# Check if we can use PkgConfig
FIND_PACKAGE(PkgConfig)
#Determine from PKG
IF(PKG_CONFIG_FOUND AND NOT FFTW_ROOT)
PKG_CHECK_MODULES( PKG_FFTW QUIET "fftw3")
ENDIF()
#Check whether to search static or dynamic libs
SET(CMAKE_FIND_LIBRARY_SUFFIXES_SAV ${CMAKE_FIND_LIBRARY_SUFFIXES})
IF(${FFTW_USE_STATIC_LIBS} )
SET(CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_STATIC_LIBRARY_SUFFIX})
ELSE()
SET(CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_SHARED_LIBRARY_SUFFIX})
ENDIF()
IF(FFTW_ROOT)
#find libs
FIND_LIBRARY(
FFTW_LIB
NAMES "fftw3" "libfftw3-3" "fftw3-3" "mkl_rt"
PATHS ${FFTW_ROOT}
PATH_SUFFIXES "lib" "lib64"
NO_DEFAULT_PATH
)
FIND_LIBRARY(
FFTWF_LIB
NAMES "fftw3f" "libfftw3f-3" "fftw3f-3" "mkl_rt"
PATHS ${FFTW_ROOT}
PATH_SUFFIXES "lib" "lib64"
NO_DEFAULT_PATH
)
#find includes
FIND_PATH(
FFTW_INCLUDES
NAMES "fftw3.h"
PATHS ${FFTW_ROOT}
PATH_SUFFIXES "include" "include/fftw"
NO_DEFAULT_PATH
)
ELSE()
FIND_LIBRARY(
FFTW_LIB
NAMES "fftw3" "mkl_rt"
PATHS ${PKG_FFTW_LIBRARY_DIRS} ${LIB_INSTALL_DIR}
)
FIND_LIBRARY(
FFTWF_LIB
NAMES "fftw3f" "mkl_rt"
PATHS ${PKG_FFTW_LIBRARY_DIRS} ${LIB_INSTALL_DIR}
)
FIND_PATH(
FFTW_INCLUDES
NAMES "fftw3.h"
PATHS ${PKG_FFTW_INCLUDE_DIRS} ${INCLUDE_INSTALL_DIR}
)
ENDIF(FFTW_ROOT)
SET(FFTW_LIBRARIES ${FFTW_LIB} ${FFTWF_LIB})
SET(CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES_SAV})
INCLUDE(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(FFTW DEFAULT_MSG
FFTW_INCLUDES FFTW_LIBRARIES)
MARK_AS_ADVANCED(FFTW_INCLUDES FFTW_LIBRARIES)
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