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36 # Find the native FFTW headers and libraries.
38 # ${FFTW}_INCLUDE_DIRS - where to find FFTW headers
39 # ${FFTW}_LIBRARIES - List of libraries when using FFTW.
40 # ${FFTW}_PKG - The name of the pkg-config package needed
41 # ${FFTW}_HAVE_SIMD - True if FFTW was built with SIMD support
42 # ${FFTW}_HAVE_SSE - True if FFTW was built with SSE support
43 # ${FFTW}_HAVE_SSE2 - True if FFTW was built with SSE2 support
44 # ${FFTW}_FOUND - True if FFTW was found
45 # where ${FFTW} is FFTW or FFTWF
47 list(LENGTH FFTW_FIND_COMPONENTS FFTW_NUM_COMPONENTS_WANTED)
48 if(${FFTW_NUM_COMPONENTS_WANTED} LESS 1)
49 message(FATAL_ERROR "No FFTW component to search given")
50 elseif(${FFTW_NUM_COMPONENTS_WANTED} GREATER 1)
51 message(FATAL_ERROR "We only support finding one FFTW component at the time, go and implement it ;-)")
52 elseif(${FFTW_FIND_COMPONENTS} MATCHES "^fftw(f)?$")
53 if (NOT FFTW_FIND_VERSION OR FFTW_FIND_VERSION EQUAL 3) #find FFTW3 by default
54 string(TOUPPER "${FFTW_FIND_COMPONENTS}" FFTW)
55 string(REGEX REPLACE "fftw" "fftw3" ${FFTW}_PKG "${FFTW_FIND_COMPONENTS}")
56 set(${FFTW}_FUNCTION_PREFIX "${FFTW_FIND_COMPONENTS}")
58 message(FATAL_ERROR "We only support finding FFTW version 3, go and implement it ;-)")
61 message(FATAL_ERROR "We do not support finding ${FFTW_FIND_COMPONENTS}, go and implement it ;-)")
64 find_package(PkgConfig QUIET)
65 if(NOT __pkg_config_checked_PC_${FFTW} OR NOT ${FFTW}_LIBRARY)
66 pkg_check_modules(PC_${FFTW} "${${FFTW}_PKG}")
67 if(NOT PC_${FFTW}_FOUND)
68 message(STATUS "pkg-config could not detect ${${FFTW}_PKG}, trying generic detection")
72 find_path(${FFTW}_INCLUDE_DIR "fftw3.h" HINTS ${PC_${FFTW}_INCLUDE_DIRS})
73 find_library(${FFTW}_LIBRARY NAMES "${${FFTW}_PKG}" HINTS ${PC_${FFTW}_LIBRARY_DIRS})
75 set(${FFTW}_LIBRARIES "${${FFTW}_LIBRARY}")
76 set(${FFTW}_INCLUDE_DIRS "${${FFTW}_INCLUDE_DIR}")
78 #better error message than find_package_handle_standard_args
79 if (${FFTW}_LIBRARY AND ${FFTW}_INCLUDE_DIR)
80 set(${FFTW}_FOUND TRUE)
81 elseif (NOT ${FFTW}_LIBRARY)
82 message("Could not find ${${FFTW}_PKG} library named lib${${FFTW}_PKG}, please specify its location in CMAKE_PREFIX_PATH or ${FFTW}_LIBRARY by hand (e.g. -D${FFTW}_LIBRARY='/path/to/lib${${FFTW}_PKG}.so')")
83 elseif (NOT ${FFTW}_INCLUDE_DIR)
84 message("Could not the ${${FFTW}_PKG} header fftw3.h, please specify its path in ${FFTW}_INCLUDE_DIR by hand (e.g. -D${FFTW}_INCLUDE_DIR='/path/to/include')")
88 #The user could specify trash in ${FFTW}_LIBRARY, so test if we can link it
89 include(CheckLibraryExists)
90 include(gmxOptionUtilities)
92 #adding MATH_LIBRARIES here to allow static libs, this does not harm us as we are anyway using it
93 set(CMAKE_REQUIRED_LIBRARIES m)
95 gmx_check_if_changed(FFTW_LIBRARY_CHANGED ${FFTW}_LIBRARIES)
96 if (FFTW_LIBRARY_CHANGED)
97 unset(FOUND_${FFTW}_PLAN CACHE)
99 check_library_exists("${${FFTW}_LIBRARIES}" "${${FFTW}_FUNCTION_PREFIX}_plan_r2r_1d" "" FOUND_${FFTW}_PLAN)
100 if(NOT FOUND_${FFTW}_PLAN)
101 message(FATAL_ERROR "Could not find ${${FFTW}_FUNCTION_PREFIX}_plan_r2r_1d in ${${FFTW}_LIBRARY}, take a look at the error message in ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log to find out what went wrong. If you are using a static lib (.a) make sure you have specified all dependencies of ${${FFTW}_PKG} in ${FFTW}_LIBRARY by hand (e.g. -D${FFTW}_LIBRARY='/path/to/lib${${FFTW}_PKG}.so;/path/to/libm.so') !")
104 # Check for FFTW3 compiled with --enable-sse
105 foreach(SSE_FUNCTION ${${FFTW}_FUNCTION_PREFIX}_have_simd_sse ${${FFTW}_FUNCTION_PREFIX}_have_sse)
106 if (FFTW_LIBRARY_CHANGED)
107 unset(${FFTW}_HAVE_${SSE_FUNCTION} CACHE)
109 check_library_exists("${${FFTW}_LIBRARIES}" "${SSE_FUNCTION}" "" ${FFTW}_HAVE_${SSE_FUNCTION})
110 if(${FFTW}_HAVE_${SSE_FUNCTION})
111 set(${FFTW}_HAVE_SSE TRUE)
112 set(${FFTW}_HAVE_SIMD TRUE)
117 # Check for FFTW3 compiled with --enable-sse2
118 foreach(SSE2_FUNCTION ${${FFTW}_FUNCTION_PREFIX}_have_simd_sse2 ${${FFTW}_FUNCTION_PREFIX}_have_sse2)
119 if (FFTW_LIBRARY_CHANGED)
120 unset(${FFTW}_HAVE_${SSE2_FUNCTION} CACHE)
122 check_library_exists("${${FFTW}_LIBRARIES}" "${SSE2_FUNCTION}" "" ${FFTW}_HAVE_${SSE2_FUNCTION})
123 if(${FFTW}_HAVE_${SSE2_FUNCTION})
124 set(${FFTW}_HAVE_SSE2 TRUE)
125 set(${FFTW}_HAVE_SIMD TRUE)
130 # Check for any other SIMD support in FFTW
131 if (NOT ${FFTW}_HAVE_SIMD)
133 ${${FFTW}_FUNCTION_PREFIX}_have_simd_avx
134 ${${FFTW}_FUNCTION_PREFIX}_have_simd_avx2
135 ${${FFTW}_FUNCTION_PREFIX}_have_simd_avx2_128
136 ${${FFTW}_FUNCTION_PREFIX}_have_simd_avx512
137 ${${FFTW}_FUNCTION_PREFIX}_have_simd_avx_128_fma
138 ${${FFTW}_FUNCTION_PREFIX}_have_simd_altivec
139 ${${FFTW}_FUNCTION_PREFIX}_have_simd_neon
140 ${${FFTW}_FUNCTION_PREFIX}_have_simd_vsx
141 ${${FFTW}_FUNCTION_PREFIX}_have_simd_altivec
142 ${${FFTW}_FUNCTION_PREFIX}_have_altivec) # Name used before FFTW 3.3
143 if (FFTW_LIBRARY_CHANGED)
144 unset(${FFTW}_HAVE_${SIMD_FCT} CACHE)
146 check_library_exists("${${FFTW}_LIBRARIES}" "${SIMD_FCT}" "" ${FFTW}_HAVE_${SIMD_FCT})
147 if(${FFTW}_HAVE_${SIMD_FCT})
148 set(${FFTW}_HAVE_SIMD TRUE)
154 #Verify FFTW is compiled with fPIC (necessary for shared libraries)
155 if (CMAKE_OBJDUMP AND CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64" AND BUILD_SHARED_LIBS AND NOT CYGWIN AND NOT APPLE)
156 execute_process(COMMAND ${CMAKE_OBJDUMP} --reloc ${${FFTW}_LIBRARY} OUTPUT_VARIABLE ${FFTW}_OBJDUMP)
157 if (${${FFTW}_OBJDUMP} MATCHES "R_X86_64" #Should always be true for static libraries. Checks that objdump works properly and that the library isn't dynamic
158 AND NOT ${${FFTW}_OBJDUMP} MATCHES "R_X86_64_PLT32")
159 message(FATAL_ERROR "The FFTW library ${${FFTW}_LIBRARY} cannot be used with shared libraries. Provide a different FFTW library by setting ${FFTW}_LIBRARY. If you don't have a different one, recompile FFTW with \"--enable-shared\" or \"--with-pic\". Or disable shared libraries for GROMACS by setting BUILD_SHARED_LIBS to \"no\". Note: Disabling shared libraries requires up to 10x as much disk space.")
162 set(CMAKE_REQUIRED_LIBRARIES)
165 mark_as_advanced(${FFTW}_INCLUDE_DIR ${FFTW}_LIBRARY)