Merge commit '23e7c6d8605e86164671fe381173ceed6705f111'

cmake/cmake-2.9.0-modules/from-ITK-3.18.0/FindFFTW.cmake

@@ -0,0 +1,68 @@
+## FFTW can be compiled and subsequently linked against
+## various data types.
+## There is a single set of include files, and then muttiple libraries,
+## One for each type.  I.e. libfftw.a-->double, libfftwf.a-->float
+
+## The following logic belongs in the individual package
+## MARK_AS_ADVANCED(USE_FFTWD)
+## OPTION(USE_FFTWD "Use double precision FFTW if found" ON)
+## MARK_AS_ADVANCED(USE_FFTWF)
+## OPTION(USE_FFTWF "Use single precision FFTW if found" ON)
+
+IF(USE_FFTWD OR USE_FFTWF)
+
+  SET(FFTW_INC_SEARCHPATH
+    /sw/include
+    /usr/include
+    /usr/local/include
+    /usr/include/fftw
+    /usr/local/include/fftw
+  )
+
+  FIND_PATH(FFTW_INCLUDE_PATH fftw3.h ${FFTW_INC_SEARCHPATH})
+
+  IF(FFTW_INCLUDE_PATH)
+    SET(FFTW_INCLUDE ${FFTW_INCLUDE_PATH})
+  ENDIF (FFTW_INCLUDE_PATH)
+
+  IF(FFTW_INCLUDE)
+    INCLUDE_DIRECTORIES( ${FFTW_INCLUDE})
+  ENDIF(FFTW_INCLUDE)
+
+  GET_FILENAME_COMPONENT(FFTW_INSTALL_BASE_PATH ${FFTW_INCLUDE_PATH} PATH)
+
+  SET(FFTW_LIB_SEARCHPATH
+    ${FFTW_INSTALL_BASE_PATH}/lib
+    /usr/lib/fftw
+    /usr/local/lib/fftw
+  )
+
+  IF(USE_FFTWD)
+    MARK_AS_ADVANCED(FFTWD_LIB)
+#   OPTION(FFTWD_LIB "The full path to the fftw3 library (including the library)" )
+    FIND_LIBRARY(FFTWD_LIB fftw3 ${FFTW_LIB_SEARCHPATH}) #Double Precision Lib
+    FIND_LIBRARY(FFTWD_THREADS_LIB fftw3_threads ${FFTW_LIB_SEARCHPATH}) #Double Precision Lib only if compiled with threads support
+
+    IF(FFTWD_LIB)
+      SET(FFTWD_FOUND 1)
+      IF(FFTWD_THREADS_LIB)
+        SET(FFTWD_LIB ${FFTWD_LIB} ${FFTWD_THREADS_LIB} )
+      ENDIF(FFTWD_THREADS_LIB)
+    ENDIF(FFTWD_LIB)
+  ENDIF(USE_FFTWD)
+
+  IF(USE_FFTWF)
+    MARK_AS_ADVANCED(FFTWF_LIB)
+#   OPTION(FFTWF_LIB "The full path to the fftw3f library (including the library)" )
+    FIND_LIBRARY(FFTWF_LIB fftw3f ${FFTW_LIB_SEARCHPATH}) #Single Precision Lib
+    FIND_LIBRARY(FFTWF_THREADS_LIB fftw3f_threads ${FFTW_LIB_SEARCHPATH}) #Single Precision Lib only if compiled with threads support
+
+    IF(FFTWF_LIB)
+      SET(FFTWF_FOUND 1)
+      IF(FFTWF_THREADS_LIB)
+        SET(FFTWF_LIB ${FFTWF_LIB} ${FFTWF_THREADS_LIB} )
+      ENDIF(FFTWF_THREADS_LIB)
+    ENDIF(FFTWF_LIB)
+  ENDIF(USE_FFTWF)
+
+ENDIF(USE_FFTWD OR USE_FFTWF)