chore: import upstream snapshot with attribution

tensorflow/lite/tools/cmake/modules/fft2d/CMakeLists.txt

@@ -0,0 +1,73 @@
+#
+# Copyright 2020 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+project(fft2d C)
+
+set(FFT2D_SOURCE_DIR "" CACHE PATH
+  "Directory that contains the fft2d project"
+)
+if(NOT FFT2D_SOURCE_DIR)
+  message(FATAL_ERROR "Must specify source directory")
+endif()
+
+# fft2d doesn't have a CMake project so define it here transcribed from
+# sample2d/Makefile.
+
+# A developer should link this library if they haven't provided their own
+# implementation of these allocation methods.
+add_library(fft2d_alloc
+  "${FFT2D_SOURCE_DIR}/alloc.c"
+  "${FFT2D_SOURCE_DIR}/alloc.h"
+)
+target_include_directories(fft2d_alloc PUBLIC "${FFT2D_SOURCE_DIR}")
+
+# Requires implementation of fft2d_alloc.
+add_library(fft2d_fft4f2d "${FFT2D_SOURCE_DIR}/fft4f2d.c")
+target_include_directories(fft2d_fft4f2d PRIVATE "${FFT2D_SOURCE_DIR}")
+
+add_library(fft2d_fftsg "${FFT2D_SOURCE_DIR}/fftsg.c")
+if(NOT CMAKE_SYSTEM_NAME STREQUAL Windows)
+target_link_libraries(fft2d_fftsg m)
+endif()
+
+install(
+  TARGETS fft2d_fftsg
+  EXPORT tensorflow-liteTargets
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+)
+
+# Requires implementation of fft2d_alloc.
+add_library(fft2d_fftsg2d "${FFT2D_SOURCE_DIR}/fftsg2d.c")
+target_link_libraries(fft2d_fftsg2d fft2d_fftsg)
+target_include_directories(fft2d_fftsg2d PRIVATE "${FFT2D_SOURCE_DIR}")
+
+# Requires implementation of fft2d_alloc.
+add_library(fft2d_fftsg3d "${FFT2D_SOURCE_DIR}/fftsg3d.c")
+target_link_libraries(fft2d_fftsg3d fft2d_fftsg)
+target_include_directories(fft2d_fftsg3d PRIVATE "${FFT2D_SOURCE_DIR}")
+
+add_library(fft2d_shrtdct "${FFT2D_SOURCE_DIR}/shrtdct.c")
+
+add_library(fft2d ALIAS fft2d_fftsg2d)
+
+install(
+  TARGETS fft2d_fftsg2d
+  EXPORT tensorflow-liteTargets
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+)