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# Find FFTW3
#
# Currently, search for FFTW thread libraries is commented out
# because I don't know how the naming scheme for those libs
# currently looks like.
#
# The following CMake variables are set by this module:
#
# FFTW_FOUND true, if a valid FFTW installation has been identified
# FFTWD_FOUND true, if double precision library found
# FFTWF_FOUND true, if single precision library found
# FFTWL_FOUND true, if long double precision library found
#
# FFTW_INCLUDE_DIR absolute directory that contains fftw3.h header file
#
# FFTWD_LIB double precision library
# FFTWF_LIB single precision library
# FFTWL_LIB long double precision library
SET(FFTW_FOUND FALSE)
SET(FFTWD_FOUND FALSE)
SET(FFTWF_FOUND FALSE)
SET(FFTWL_FOUND FALSE)
# Define allowed fftw verions
SET(FFTW_ALLOWED_VERSIONS 3 3.0 3.0.1 3.1 3.1.1 3.2 3.2.1 3.3 3.3.1 3.3.2 3.3.3 3.3.4 3.3.5 3.3.6)
# Add additional search paths
SET(CUSTOM_SEARCH_PATHS /usr/local /opt/local)
# Try to find fftw3.h
FIND_PATH(FFTW_INCLUDE_DIR fftw3.h
PATHS ${CUSTOM_SEARCH_PATHS}
PATH_SUFFIXES include)
# If not found, return.
IF(NOT FFTW_INCLUDE_DIR)
RETURN()
ENDIF()
# Get a hint where to search for the installed fftw libraries
GET_FILENAME_COMPONENT(FFTW_INSTALL_BASE ${FFTW_INCLUDE_DIR} PATH)
LIST(APPEND CUSTOM_SEARCH_PATHS ${FFTW_INSTALL_BASE})
# The fftw types searched for are
# D: double precision library
# F: single precision library
# L: long double precision library
SET(FFTW_TYPES "D;F;L")
# Now, iterate over these types and search for the corresponding fftw libraries
FOREACH(fftw_type IN LISTS FFTW_TYPES)
IF(${fftw_type} STREQUAL "D")
SET(FFTW_TYPE_SUFFIX "")
ELSE()
STRING(TOLOWER ${fftw_type} FFTW_TYPE_SUFFIX)
ENDIF()
# Generate all possible library names
SET(FFTW_LIB_NAMES "")
SET(FFTW_THREAD_LIB_NAMES "")
FOREACH(fftw_allowed_version ${FFTW_ALLOWED_VERSIONS})
LIST(APPEND FFTW_LIB_NAMES fftw${FFTW_TYPE_SUFFIX}${fftw_allowed_version} libfftw${FFTW_TYPE_SUFFIX}-${fftw_allowed_version})
#LIST(APPEND FFTW_THREAD_LIB_NAMES TODO: Find out fftw thread lib names)
ENDFOREACH()
FIND_LIBRARY(FFTW${fftw_type}_LIB NAMES ${FFTW_LIB_NAMES}
PATHS ${CUSTOM_SEARCH_PATHS}
PATH_SUFFIXES lib lib64)
IF(FFTW${fftw_type}_LIB)
SET(FFTW${fftw_type}_FOUND TRUE)
ENDIF()
#FIND_LIBRARY(FFTW${fftw_type}_THREADS_LIB NAMES ${FFTW_THREAD_LIB_NAMES}
# PATHS ${CUSTOM_SEARCH_PATHS}
# PATH_SUFFIXES lib lib64)
#IF(FFTW${fftw_type}_THREADS_LIB)
# SET(FFTW${fftw_type}_LIB ${FFTW${fftw_type}_LIB} ${FFTW${fftw_type}_THREADS_LIB})
#ENDIF()
ENDFOREACH()
IF(FFTWD_FOUND OR FFTWF_FOUND OR FFTWL_FOUND)
SET(FFTW_FOUND TRUE)
ENDIF()
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