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#
# Encapsulates building FFTW as an External Project.
include(ITK_CheckCCompilerFlag)
set(msg "ATTENTION: You have enabled the use of FFTW.")
set(msg "${msg} This library is distributed under a GPL license.")
set(msg "${msg} By enabling this option, the ITK libraries binary")
set(msg "${msg} that is built will be covered by a GPL license")
set(msg "${msg} and so will any executable that is linked against these libraries.")
message("${msg}")
#--check_c_compiler_flag(-fopenmp C_HAS_fopenmp)
#--if(${C_HAS_fopenmp} AND FALSE)
#-- set(FFTW_THREADS_CONFIGURATION --enable-openmp)
#-- set(OPENMP_FLAG "-fopenmp")
#-- else()
set(FFTW_THREADS_CONFIGURATION --enable-threads)
set(OPENMP_FLAG "")
#--endif()
# from FFTW's configure command:
#--Some influential environment variables:
#-- CC C compiler command
#-- CFLAGS C compiler flags
#-- LDFLAGS linker flags, e.g. -L<lib dir> if you have libraries in a
#-- nonstandard directory <lib dir>
#-- LIBS libraries to pass to the linker, e.g. -l<library>
#-- CPPFLAGS C/C++/Objective C preprocessor flags, e.g. -I<include dir> if
#-- you have headers in a nonstandard directory <include dir>
set(_additional_configure_env)
set(_additional_external_project_args)
if (APPLE)
list(APPEND _additional_configure_env
"SDKROOT=${CMAKE_OSX_SYSROOT}"
"MACOSX_DEPLOYMENT_TARGET=${CMAKE_OSX_DEPLOYMENT_TARGET}"
)
list(APPEND _additional_external_project_args
BUILD_COMMAND
env
"SDKROOT=${CMAKE_OSX_SYSROOT}"
"MACOSX_DEPLOYMENT_TARGET=${CMAKE_OSX_DEPLOYMENT_TARGET}"
make
INSTALL_COMMAND
env
"SDKROOT=${CMAKE_OSX_SYSROOT}"
"MACOSX_DEPLOYMENT_TARGET=${CMAKE_OSX_DEPLOYMENT_TARGET}"
make
install
)
endif()
## Perhaps in the future a set of TryCompiles could be used here.
set(FFTW_OPTIMIZATION_CONFIGURATION "" CACHE INTERNAL "architecture flags: --enable-sse --enable-sse2 --enable-altivec --enable-mips-ps --enable-cell")
if(ITK_USE_SYSTEM_FFTW)
find_package( FFTW )
link_directories(${FFTW_LIBDIR})
else()
if(WIN32 AND NOT MINGW)
message("Can't build fftw as external project on Windows")
message(ERROR "install fftw and use ITK_USE_SYSTEM_FFTW")
else()
#
# fftw limitation -- can't be built in
# a directory with whitespace in its name.
if(${CMAKE_CURRENT_BINARY_DIR} MATCHES ".*[ \t].*")
message(FATAL_ERROR
"Can't build fftw in a directory with whitespace in its name")
endif()
#
# build fftw as an external project
if(BUILD_SHARED_LIBS)
set(FFTW_SHARED_FLAG --enable-shared)
endif()
#
# set fPIC flag if needed
set(GCC_POSITION_INDEPENDENT_CODE_FLAG "")
if(CMAKE_POSITION_INDEPENDENT_CODE)
set(GCC_POSITION_INDEPENDENT_CODE_FLAG "-fPIC")
endif()
set(_fftw_target_version 3.3.4)
set(_fftw_url_hash "1ee2c7bec3657f6846e63c6dfa71410563830d2b951966bf0123bd8f4f2f5d6b50f13b76d9a7b0eae70e44856f829ca6ceb3d080bb01649d1572c9f3f68e8eb1")
set(_fftw_url "https://data.kitware.com/api/v1/file/hashsum/sha512/${_fftw_url_hash}/download")
if(ITK_USE_FFTWF)
itk_download_attempt_check(FFTW)
ExternalProject_add(fftwf
PREFIX fftwf
URL "${_fftw_url}"
URL_HASH SHA512=${_fftw_url_hash}
DOWNLOAD_NAME "fftw-${_fftw_target_version}.tar.gz"
CONFIGURE_COMMAND
env
"CC=${CMAKE_C_COMPILER_LAUNCHER} ${CMAKE_C_COMPILER}"
"CFLAGS=${CMAKE_C_FLAGS} ${CMAKE_C_FLAGS_RELEASE} ${GCC_POSITION_INDEPENDENT_CODE_FLAG}"
"LDFLAGS=$ENV{LDFLAGS}"
"LIBS=$ENV{LIBS}"
"CPP=$ENV{CPP}"
"CPPFLAGS=$ENV{CPPFLAGS}"
"CXXFLAGS=$ENV{CXXFLAGS} ${GCC_POSITION_INDEPENDENT_CODE_FLAG}"
${_additional_configure_env}
${ITK_BINARY_DIR}/fftwf/src/fftwf/configure
${FFTW_SHARED_FLAG}
${FFTW_OPTIMIZATION_CONFIGURATION}
${FFTW_THREADS_CONFIGURATION}
--disable-fortran
--enable-float
--prefix=${ITK_BINARY_DIR}/fftw
${_additional_external_project_args}
)
endif()
if(ITK_USE_FFTWD)
itk_download_attempt_check(FFTW)
ExternalProject_add(fftwd
PREFIX fftwd
URL "${_fftw_url}"
URL_HASH SHA512=${_fftw_url_hash}
DOWNLOAD_NAME "fftw-${_fftw_target_version}.tar.gz"
CONFIGURE_COMMAND
env
"CC=${CMAKE_C_COMPILER_LAUNCHER} ${CMAKE_C_COMPILER}"
"CFLAGS=${CMAKE_C_FLAGS} ${CMAKE_C_FLAGS_RELEASE} ${GCC_POSITION_INDEPENDENT_CODE_FLAG}"
"LDFLAGS=$ENV{LDFLAGS}"
"LIBS=$ENV{LIBS}"
"CPP=$ENV{CPP}"
"CPPFLAGS=$ENV{CPPFLAGS}"
"CXXFLAGS=$ENV{CXXFLAGS} ${GCC_POSITION_INDEPENDENT_CODE_FLAG}"
${_additional_configure_env}
${ITK_BINARY_DIR}/fftwd/src/fftwd/configure
${FFTW_SHARED_FLAG}
${FFTW_OPTIMIZATION_CONFIGURATION}
${FFTW_THREADS_CONFIGURATION}
--disable-fortran
--disable-float
--prefix=${ITK_BINARY_DIR}/fftw
${_additional_external_project_args}
)
endif()
set(FFTW_INCLUDE_PATH ${ITK_BINARY_DIR}/fftw/include)
set(FFTW_LIBDIR ${ITK_BINARY_DIR}/fftw/lib)
link_directories(${FFTW_LIBDIR})
include_directories(${FFTW_INCLUDE_PATH})
#
# copy libraries into install tree
install(CODE
"file(GLOB FFTW_LIBS ${ITK_BINARY_DIR}/fftw/lib/*fftw3*)
file(INSTALL DESTINATION \"\${CMAKE_INSTALL_PREFIX}/lib/ITK-${ITK_VERSION_MAJOR}.${ITK_VERSION_MINOR}\"
TYPE FILE FILES \${FFTW_LIBS})" COMPONENT Development)
#
# copy headers into install tree
install(CODE
"file(GLOB FFTW_INC ${ITK_BINARY_DIR}/fftw/include/*fftw3*)
file(INSTALL DESTINATION \"\${CMAKE_INSTALL_PREFIX}/include/ITK-${ITK_VERSION_MAJOR}.${ITK_VERSION_MINOR}/Algorithms\"
TYPE FILE FILES \${FFTW_INC})" COMPONENT Development)
endif()
endif()
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