# - 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

find_package(PkgConfig)

pkg_check_modules(PKG_FFTW "fftw3")

find_path( FFTW_INCLUDE_DIR

NAMES "fftw3.h"

PATHS ${FFTW_ROOT}

${CMAKE_SYSTEM_INCLUDE_PATH}

${CMAKE_SYSTEM_PREFIX_PATH}

${PKG_FFTW_INCLUDE_DIRS}

PATH_SUFFIXES "include" "include/fftw"

)

find_library( FFTW_LIBRARY

NAMES "fftw3" "libfftw3-3" "fftw3-3"

PATHS ${FFTW_ROOT}

${CMAKE_SYSTEM_PREFIX_PATH}

${PKG_FFTW_LIBRARY_DIRS}

PATH_SUFFIXES "lib" "lib64"

)

find_library( FFTWF_LIBRARY

NAMES "fftw3f" "libfftw3f-3" "fftw3f-3"

PATHS ${FFTW_ROOT}

${CMAKE_SYSTEM_PREFIX_PATH}

${CMAKE_SYSTEM_LIBRARY_PATH}

${PKG_FFTW_LIBRARY_DIRS}

PATH_SUFFIXES "lib" "lib64"

)

mark_as_advanced(FFTW_INCLUDE_DIR FFTW_LIBRARY FFTWF_LIBRARY)

include(FindPackageHandleStandardArgs)

find_package_handle_standard_args(FFTW DEFAULT_MSG

FFTW_INCLUDE_DIR FFTW_LIBRARY FFTWF_LIBRARY)

if (FFTW_FOUND)

add_library(FFTW::FFTW UNKNOWN IMPORTED)

set_target_properties(FFTW::FFTW PROPERTIES

IMPORTED_LINK_INTERFACE_LANGUAGE "C"

IMPORTED_LOCATION "${FFTW_LIBRARY}"

INTERFACE_INCLUDE_DIRECTORIES "${FFTW_INCLUDE_DIR}")

add_library(FFTW::FFTWF UNKNOWN IMPORTED)

set_target_properties(FFTW::FFTWF PROPERTIES

IMPORTED_LINK_INTERFACE_LANGUAGE "C"

IMPORTED_LOCATION "${FFTWF_LIBRARY}"

INTERFACE_INCLUDE_DIRECTORIES "${FFTW_INCLUDE_DIR}")

endif (FFTW_FOUND)